JP7230069B2 - Mosquito control aerosol and mosquito control method - Google Patents

Description

The present invention comprises a pressure-resistant container in which an aerosol stock solution containing an insect-controlling component and an organic solvent and a propellant are sealed, a fixed-quantity injection valve attached to the mouth of the pressure-resistant container, and an injection port connected to the fixed-quantity injection valve. and a mosquito control method using the same.

Methods for exterminating flying pests include, for example, a method in which a carrier impregnated with a pesticidal agent containing an insecticidal component is impregnated with a pesticidal agent to evaporate the pesticide into a treatment space, a method in which the pesticide is directly sprayed on flying pests, and a method in which flying pests are likely to appear. There is a method of spraying a drug in advance, and the like. Regarding these methods, aerosol insecticides containing insecticidal components have been developed as products for exterminating flying insects that invade indoors. Aerosol insecticides are widely used as easy-to-use products because the insecticidal component can be easily sprayed into the treatment space.

Conventionally, there has been an aerosol insecticide that suppresses a decrease in the residual rate of the agent in the indoor air (see Patent Document 1, for example). According to Patent Document 1, after the drug is released, the drug is kept in the air to suppress the decrease in air concentration, so that it is possible to maintain a sufficient extermination effect against mosquitoes hiding in the shadows. there is

In addition, there is an aerosol insecticide in which the particle size when sprayed indoors is set larger than that in Patent Document 1 (see Patent Document 2, for example). Patent Document 2 is an aerosol insecticide based on the same technical idea as Patent Document 1, and aims to increase the insecticidal effect against mosquitoes by allowing the drug to remain in the air in the room as long as possible.

On the other hand, with respect to aerosol insecticides, there is a method for exterminating flying pests in a house characterized by attaching the aerosol insecticides to the surfaces of indoor structures or fixtures (see, for example, Patent Document 3). According to Patent Document 3, since a specific compound attached to an indoor structure etc. transpires, there is no need for repeated spraying or continuous operation of electric appliances, etc., and it is possible to eliminate indoor flying pests by simple means. can be effectively eradicated.

Further, in view of the widespread use of metered injection type aerosol insecticides, the present inventors used at least one pest control component selected from the group consisting of metofruthrin, profluthrin and transfluthrin, and used a solvent In addition to using a lower alcohol with 2 to 3 carbon atoms as the spray force, the particle size distribution of the sprayed particles, and the adhesion efficiency of the sprayed particles to the floor and wall surfaces in the room, the treatment space is kept for 5 to 12 hours. We have developed a pest control method using a metered injection type aerosol that can control both flying pests and crawling pests (see Patent Document 4).

Japanese Unexamined Patent Application Publication No. 2001-17055 JP 2013-99336 A JP-A-2001-328913 Japanese Patent No. 5517496

The aerosol insecticide of Patent Document 1 attempts to increase the duration of the drug by adjusting the particle size of the drug that diffuses into the room so that the drug remains in the air longer. However, the residual rate of drug particles in the air is 0.5% or more in 12 hours or more from the start of treatment, and the aerosol insecticide of Patent Document 1, which aims to maintain the residual rate in the air, has a limited duration. be. Also in Patent Document 2, the residual rate of drug particles in the air is the same as in Patent Document 1, and it is not an aerosol insecticide that can be expected to last for a long time.

Here, among the mosquitoes to be controlled (not only ordinary mosquitoes such as Culex pipiens and Aedes albopictus, but also chironomid and moth flies belonging to the suborder), Culex pipiens and Aedes albopictus in particular are blood-sucking mosquitoes. It is necessary to protect oneself from these mosquitoes because they not only kill but also transmit infectious diseases. Mosquitoes are flying pests that invade indoors day and night, so an insecticide that is effective all day long, ie, 24 hours, is ideal.

However, as described above, the aerosol insecticides disclosed in Patent Documents 1 and 2 are effective only for about 12 hours. In Patent Documents 1 and 2, the drug is positively left in the air by adjusting the particle size of the drug. , the person or pet in the treatment space is placed in an environment in which the drug is inhaled for a long time. Therefore, it is difficult to say that it is a preferable aerosol insecticide in terms of its effect on humans and pets.

It is unclear whether the method of extermination of Patent Document 3 can also maintain a stable effect over a long period of time. The drug particles injected into the air (A) remain suspended in the air, (B) adhere to floors and walls, (C) volatilize again after (B), or (D) decompose by light or the like. and disappear. In light of these, the extermination method of Patent Document 3 corresponds to type (C). However, when the chemical adhering to indoor structures volatilizes again into the air, it is easily affected by temperature, air volume, etc. Therefore, the extermination method of Patent Document 3 has a stable effect on extermination of flying pests. It is not guaranteed that you will get it.

The lower alcohol having 2 to 3 carbon atoms used as a solvent in the pest control method of Patent Document 4 dries more quickly than other solvents such as higher fatty acid esters, and evaporates quickly after spraying, so that It is a highly useful solvent for metered injection type aerosols because the concentration of pest-controlling ingredients increases and the control effect improves. However, even with the aerosol insecticide used in the pest control method of Patent Document 4, the pest control effect lasts only for about 12 hours. In addition, the present inventors have conducted various studies on fixed-quantity injection type aerosols using 2 to 3 lower alcohols as solvents, and found that after repeated use of fixed-quantity injection type aerosols, the operation stability of the fixed-quantity injection valve There is still room for improvement in the aerosol insecticide of Patent Document 4.

The present invention has been devised in view of the above-mentioned problems, and it is possible to improve the operational stability of a metered injection valve after repeated use, and at the same time, maintain an excellent control effect against flying pests, especially mosquitoes, over a long period of time. To provide a mosquito-controlling aerosol that can be exerted over a period of time and has reduced effects on humans and pets, and to provide a mosquito-controlling method using the mosquito-controlling aerosol.

The characteristic configuration of the mosquito control aerosol according to the present invention for solving the above problems is
an aerosol undiluted solution containing transfluthrin and/or methofluthrin as pest control components and lower alcohol and/or hydrocarbon solvent as an organic solvent, and a pressure container in which a propellant is enclosed;
a constant injection valve having a valve mechanism including a stem, a stem rubber, and a spring, and a housing accommodating the valve mechanism, and assembled to the mouth of the pressure vessel;
an injection button provided with an injection port connected to the fixed quantity injection valve;
A mosquito control aerosol comprising:
The volume ratio (a/b) between the aerosol stock solution (a) and the propellant (b) is 6/94 to 50/50,
The material of the stem rubber is acrylonitrile butadiene rubber,
the spring is a reinforced spring;
The injection volume when the injection button is pressed once is 0.1 to 1.0 mL,
The particle diameter of the injected particles injected from the injection port is such that the 90% particle diameter in the volume integrated distribution at 25° C. and the injection distance of 15 cm is 10 to 80 μm.

As described in "Problems to be Solved by the Invention", conventional aerosol insecticides are being developed in the direction of actively diffusing the drug particles in the treatment space and extending the time they remain in the air as long as possible. had been However, if the residence time of the drug particles floating in the processing space is long, people or pets may inhale the drug particles if they enter the processing space, resulting in health concerns. be.

By the way, according to the research of the present inventors, mosquitoes typified by mosquitoes (hereinafter simply referred to as "mosquitoes" in the present invention) spend more time staying on walls than flying. turned out to be longer. In other words, most of the mosquitoes that have invaded indoors stay on walls and wait for opportunities to suck blood from humans. For this reason, the conventional technique of prolonging the time during which the drug particles float in the treatment space can produce a certain effect in controlling flying mosquitoes, but the effect is limited to wall surfaces and the like. The effect of the drug cannot be sufficiently exerted on the mosquitoes that are infected, and as a result, the control of the mosquitoes may be incomplete. From the above research results, the present inventors have found that increasing the effect of controlling mosquitoes that are perched on walls etc. will suppress the inhalation of drugs by humans and pets, while preventing mosquitoes that invade indoors. It was thought that this would lead to an improvement in control of the whole species.

Therefore, in the mosquito-controlling aerosol of the present invention, when the undiluted aerosol solution is sprayed into the treatment space, the sprayed particles are exposed to the exposed parts in the treatment space (for example, the floor surface, wall surface, furniture, etc. existing in the treatment space). surface of the structure, etc.) and adhere to the exposed part. As a result, it is possible to effectively knock down or kill both the mosquitoes that are perched in the exposed area and the mosquitoes that are flying in the treatment space, thereby improving the overall mosquito control effect. can. With regard to aerosol spray particles, the present inventors, after extensive research, used transfluthrin and/or metofluthrin as the pest control component, and used an aerosol undiluted solution using a lower alcohol and/or hydrocarbon solvent as the organic solvent. It has been found that this favors the formation of particles suitable for controlling mosquitoes. In this case, the effect of the pest-controlling component contained in the sprayed particles can be exhibited reliably and efficiently. Moreover, preparation of an aerosol stock solution can be performed easily.

Subsequently, the volume ratio (a/b) of the aerosol undiluted solution (a) and the propellant (b) was 6/94 to 50/50, and the injection volume when the injection button was pressed once was 0.1 to 1.0. When adjusted to be 0 mL, the sprayed particles quickly move to and adhere to the exposed portion in the processing space. As a result, mosquitoes resting on exposed areas can be reliably knocked down or killed by the pest control component.

Furthermore, the particle size of the sprayed particles is formed so that the 90% particle size in the volume integrated distribution at 25° C. and the spray distance of 15 cm is in the range of 10 to 80 μm. Within such a range, mosquitoes resting on the exposed portion can be reliably knocked down or killed by the pest control component.

Further, the fixed-quantity injection valve for a mosquito-controlling aerosol of the present invention has a valve mechanism including a stem, a stem rubber, and a spring, and a housing for accommodating the valve mechanism. By adopting a reinforced spring as the spring, the operation stability of the fixed quantity injection valve is improved, and even after repeated use of the mosquito-controlling aerosol, the depressed injection button returns well.

In the mosquito control aerosol according to the present invention,
Preferably, the reinforcing spring has a spring constant of 3.3 N/mm or more.

According to the mosquito-controlling aerosol of this configuration, by adopting a spring with a spring constant of 3.3 N / mm or more as the spring, the operation stability of the fixed-quantity injection valve is further improved, and the mosquito-controlling aerosol is injected. The quality and performance of the aerosol can be maintained for a long period of time because the button is reliably restored even when the button is repeatedly pressed many times.

In the mosquito control aerosol according to the present invention,
Preferably, the pest control component is transfluthrin.

According to the mosquito-controlling aerosol of this configuration, when the insect-controlling component is transfluthrin, mosquitoes can be controlled more effectively.

In the mosquito control aerosol according to the present invention,
When the aerosol undiluted solution is injected into the treatment space once, the pest control component has a residual rate of 0.05 to 5% in the air after 2 hours, and the effect duration of the pest control component is 33.3 m. Preferably 18 hours or more for ³ or less spaces.

According to the mosquito control aerosol of this configuration, when the aerosol undiluted solution is injected into the processing space once, the pest control component remains in the air (in the processing space) after 2 hours at a rate of 0.05 to 5%. and the duration of effect of the pest control component is adjusted to be 18 hours or more for a space of 33.3 m ³ or less, so that the sprayed particles sprayed into the treatment space are exposed to the inside of the treatment space quickly move and adhere to the part. On the other hand, the sprayed particles floating in the processing space are reduced by the sprayed particles adhering to the exposed portion. In other words, the mosquito-controlling aerosol of the present invention does not spread the undiluted aerosol solution throughout the treatment space like conventional products, so that the risk of affecting human bodies and pets is significantly reduced compared to conventional products. becomes. In addition, the pest control component of the sprayed particles floating in the treatment space can also exhibit the effect of knocking down or killing mosquitoes flying in the treatment space. Moreover, with the mosquito-controlling aerosol according to the present invention, by injecting the undiluted aerosol solution into the treatment space only once, the insect-controlling effect can be sustained for 18 hours or more in a space of 33.3 m ³ or less. Therefore, it is possible to maintain a comfortable space that keeps pests away for most of the day.

In the mosquito control aerosol according to the present invention,
The particle diameter of the injected particles injected from the injection port preferably has a 90% particle diameter of 25 to 70 μm in a volume integrated distribution at 25° C. and an injection distance of 15 cm.

According to the mosquito-controlling aerosol of this configuration, the sprayed particles are adjusted to the optimum range described above, so that the sprayed particles quickly move and adhere to the exposed portion in the treatment space. Therefore, it is possible to more reliably knock down or kill mosquitoes perched on the exposed portion.

In the mosquito control aerosol according to the present invention,
It is preferable that the injection volume is 0.1 to 0.2 mL when the injection button is pressed once.

According to the mosquito control aerosol of this configuration, by adjusting the injection capacity to the optimum range as described above, the injected particles exist in a more suitable state, and the effect of the pest control component is maximized. can demonstrate.

In the mosquito control aerosol according to the present invention,
It is preferable that the injection amount of the pest control component when the injection button is pressed once is 5.0 to 30 mg per treatment space of 18.8 to 33.3 m ³ .

According to the mosquito-controlling aerosol of this configuration, the injection amount of the insect-controlling component when the injection button is pressed once is adjusted to be within the above-mentioned optimum range, so the injection particles can be quickly processed. Moves and attaches to exposed parts in space. As a result, mosquitoes resting on exposed areas can be reliably knocked down or killed by the pest control component.

In the mosquito control aerosol according to the present invention,
The organic solvent is preferably a lower alcohol having 2 to 3 carbon atoms.

According to the mosquito-controlling aerosol of this configuration, when the organic solvent is a lower alcohol having 2 to 3 carbon atoms, the effect of the insect-controlling component can be exhibited more efficiently.

In the mosquito control aerosol according to the present invention,
The aerosol stock solution preferably contains a higher fatty acid ester having a total number of carbon atoms of 13 to 20 and/or a glycol having 3 to 6 carbon atoms as an aid for reducing sensitivity to transfluthrin.

According to the mosquito control aerosol of this configuration, higher fatty acid esters with a total number of carbon atoms of 13 to 20 and / or glycols with a carbon number of 3 to 6 are used in combination with transfluthrin to reduce sensitivity. Since it acts as a coping aid, it can exhibit a high control effect even against mosquitoes whose sensitivity to transfluthrin has decreased.

The characteristic configuration of the mosquito control method according to the present invention for solving the above problems is
The mosquito control aerosol described in any one of the above is used to inject the aerosol undiluted solution into a treatment space to knock down or kill mosquitoes.

Since the mosquito control method of this configuration is carried out using the mosquito control aerosol of the present invention, it is possible to exhibit the excellent mosquito control effect as described above.

FIG. 1 is a cross-sectional view of a fixed quantity injection valve provided in a mosquito-controlling aerosol according to the present invention. FIG. 2 is a model diagram showing the behavior of injected particles when the undiluted aerosol solution is injected into the processing space.

The mosquito-controlling aerosol of the present invention contains an aerosol undiluted solution containing transfluthrin and/or metofluthrin, which are pest control components, and a lower alcohol and/or hydrocarbon solvent used as an organic solvent, and a propellant. a fixed quantity injection valve attached to the mouth of the pressure container; and an injection button provided with an injection port connected to the fixed quantity injection valve. The mosquito-controlling aerosol of the present invention is described below. However, the present invention is not intended to be limited to the embodiments described below or the configurations described in the drawings.

<Aerosol stock solution>
[Insect Control Ingredients]
Transfluthrin and/or metofluthrin, which are pyrethroid compounds, are used as the pest control component, which is one of the main components of the aerosol concentrate. In addition, transfluthrin and metofruthrin have optical isomers and geometric isomers based on an asymmetric carbon, and these are also included in the present invention. A preferred pest control ingredient is transfluthrin. Transfluthrin can be used more effectively than metofluthrin and profluthrin even against flying pests with reduced susceptibility to pyrethroid compounds. Therefore, when transfluthrin is used as an insect-controlling component, the mosquito-controlling aerosol of the present invention shows a relatively small reduction in its control effect against flying insects of the pyrethroid-resistant strain.

The content of the pest control component in the aerosol stock solution is 1.0 to 60 weight, considering that it is dissolved in a lower alcohol and / or hydrocarbon solvent used as an organic solvent and then sprayed into the treatment space. %. Within such a range, the pest control component is easily dissolved in the lower alcohol and/or hydrocarbon solvent (organic solvent), and when the aerosol stock solution is sprayed, the sprayed particles are formed in an optimal state, The effect of the pest control component can be exhibited. If the content of the pest-controlling component in the aerosol concentrate is less than 1.0% by weight, the pest-controlling component cannot be effectively exerted, resulting in an insufficient mosquito-controlling effect. On the other hand, if the content of the pest-controlling component in the aerosol concentrate exceeds 60% by weight, the concentration of the pest-controlling component increases, making it difficult to prepare the aerosol concentrate appropriately.

As described above, the pest control component contained in the mosquito control aerosol of the present invention is transfluthrin and/or metofluthrin. Other pyrethroid compounds such as fluthrin, phthalthrin, resmethrin, cyfluthrin, phenothrin, permethrin, cyphenothrin, cypermethrin, allethrin, prallethrin, flamethrin, imiprothrin, and etofenprox, silicon compounds such as silafluofen, dichlorvos, fenitrothion, etc. It is also possible to contain organic phosphorus compounds such as propoxur and carbamate compounds such as propoxur.

The pest control component is preferably adjusted so that when the undiluted aerosol solution is sprayed into the treatment space once, the residual rate in the air (in the treatment space) after 2 hours has passed is 0.05 to 5%. The air survival rate is the ratio of the number (Q) of particles present in the processing space after a predetermined time to the number (P) of particles present in the processing space immediately after injection, that is, Q/P × 100 (%). However, as will be briefly described in the examples below, the theoretical concentration of the pest control component in the air (weight basis) and the concentration of the pest control component in the air after a predetermined time (weight base). The injection amount of the aerosol undiluted solution is 18.8 to 33.3 m ³ treatment space (area 7.5 to 13.3 m ² , height 2.2 to 3.0 m, 4.5 It is preferable to adjust to 5.0 to 30 mg per (equivalent to a room of ~8 tatami mats). Within this range, the sprayed particles are optimally formed from the aerosol stock solution, and the pest control effect can be exhibited. Moreover, even with a relatively low survival rate in the air as described above, mosquitoes can be effectively knocked down or killed. Furthermore, even if a person or pet in the treatment space inhales it, there is no danger that it will affect the human body or the pet, and it can be used safely.

[Organic solvent]
The main component of the aerosol concentrate contains an organic solvent in addition to the pest control component described above. The organic solvent used can dissolve the pest control component to prepare an aerosol stock solution, and can form optimal spray particles when the prepared aerosol stock solution is sprayed into the treatment space. In the mosquito-controlling aerosol of the present invention, a lower alcohol and/or hydrocarbon solvent is used as the organic solvent. Lower alcohols preferably have 2 to 3 carbon atoms. Lower alcohols having 2 to 3 carbon atoms include ethanol, normal propanol and isopropanol (IPA). Examples of hydrocarbon solvents include normal paraffin and isoparaffin. Among these, lower alcohols having 2 to 3 carbon atoms are preferred, and ethanol is particularly preferred. A lower alcohol having 2 to 3 carbon atoms dries quickly and evaporates quickly after being sprayed, so the concentration of pest control components in the sprayed particles increases, forming particles suitable for controlling mosquitoes and contained in the sprayed particles. The effect of the pest control component can be exhibited reliably and efficiently. Moreover, preparation of an aerosol stock solution can be performed easily. Further, as an organic solvent, it is possible to further mix glycol ethers and the like.

[Aid for reducing susceptibility]
The aerosol stock solution preferably contains a higher fatty acid ester having 13 to 20 carbon atoms in total and/or a glycol having 3 to 6 carbon atoms as an aid for reducing the sensitivity of pyrethroid compounds. Higher fatty acid esters having a total of 13 to 20 carbon atoms include isopropyl myristate (IPM), methyl myristate, hexyl laurate, and isopropyl laurate. Glycols having 3 to 6 carbon atoms include 1,3-butylene glycol, 1,4-butylene glycol, dipropylene glycol, 1,2-hexanediol and 1,6-hexanediol. The present inventors have found that the above-mentioned higher fatty acid esters having a total number of carbon atoms of 13 to 20 and glycols having a carbon number of 3 to 6 are specific to pests, especially mosquitoes, with reduced sensitivity to pyrethroid compounds. The inventors have found that it is effective in treating sensitization, and that its action can be utilized as an agent for reducing susceptibility. Blending 2.0 to 20% by weight of these in the aerosol stock solution can particularly enhance usefulness. Conventionally, a compound that enhances the inherent insecticidal effect against pyrethroid-sensitive pests is often referred to as an "efficacy enhancer". Compounds that reduce the degree of reduction in control efficacy are distinguished from conventional "efficacy enhancers" and are defined as "susceptibility-reducing coping aids." Although the mechanisms of action of both have not been clearly elucidated, the "efficacy enhancer" does not necessarily fall under the category of "helper to reduce susceptibility." If the amount of the desensitization coping agent is less than 2.0% by weight, the effect of reducing the degree of decrease in insect control effect will be poor. On the other hand, even if the content exceeds 20% by weight, not only does the pest control effect peak out, but there is also concern that the properties of the aerosol stock solution will be affected.

[Other ingredients]
In the mosquito-controlling aerosol of the present invention, in addition to the above components, a nonionic surfactant can be added as a solubilizing aid to the aerosol undiluted solution. Examples of nonionic surfactants include ethers such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene alkylamino ethers, and polyethylene glycol fatty acids. esters, fatty acid esters such as polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyoxyethylene styrenated phenols, polyalcalolamides of fatty acids, etc. Among these, ethers are preferred. can be used for

In addition, miticides, antifungal agents for molds and fungi, antibacterial agents, disinfectants, fragrances, deodorants, stabilizers, antistatic agents, antifoaming agents, excipients, synergists, etc. Agents and the like can also be blended as appropriate. Acaricides include methyl 5-chloro-2-trifluoromethanesulfonamide benzoate, phenyl salicylate, 3-iodo-2-propynylbutyl carbamate and the like. Antifungal agents, antibacterial agents, and fungicides include hinokitiol, 2-mercaptobenzothiazole, 2-(4-thiazolyl)benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, trifoline, 3 -methyl-4-isopropylphenol, ortho-phenylphenol and the like. Fragrances include orange oil, lemon oil, lavender oil, peppermint oil, eucalyptus oil, citronella oil, lime oil, yuzu oil, jasmine oil, cypress oil, green tea essential oil, limonene, α-pinene, linalool, geraniol, phenylethyl. Fragrant ingredients such as alcohol, amylcinnamic aldehyde, cumin aldehyde, and benzyl acetate, and fragrance ingredients containing green leaf alcohol and green leaf aldehyde, which are called "green scents", can be mentioned. Synergists include piperonyl butoxide, octylbicycloheptenedicarboximide, and the like.

<Propellant>
Propellants used in the mosquito-controlling aerosol of the present invention include liquefied petroleum gas (LPG), dimethyl ether (DME), liquefied gases such as hydrofluoroolefin, nitrogen gas, carbon dioxide gas, nitrous oxide, compressed air and the like. gas. The above-mentioned propellants can be used singly or in a mixed state, but those containing LPG as a main component are easy to use.

The mosquito-controlling aerosol of the present invention is adjusted so that the volume ratio (a/b) of the aerosol undiluted solution (a) and the propellant (b) is 6/94 to 50/50. By adjusting the pressure within such a range, it is possible to optimally form the injected particles from the injection port connected to the fixed quantity injection valve provided in the pressure vessel. The sprayed particles once sprayed can quickly move to and adhere to the exposed portion in the processing space. On the other hand, among the sprayed particles, the sprayed particles that have not adhered to the exposed portion float in the processing space, but are present in an amount that does not affect the human body or pets. In this way, the sprayed particles are present in the treatment space in an optimal state, and the pest control effect can be maximized. When the volume ratio (a/b) is 6/94 and the ratio of the propellant (b) is increased, that is, when the amount of the propellant enclosed in the pressure container is increased, the aerosol undiluted solution to be jetted is formed Since the sprayed particles are made finer than necessary, the amount of the sprayed particles adhering to the exposed portion in the processing space is reduced. As a result, it may not be possible to reliably control mosquitoes perched on the exposed portion. On the other hand, when the volume ratio (a/b) is 50/50, the ratio of the propellant (b) is decreased, that is, when the amount of the propellant enclosed in the pressure container is reduced, the aerosol stock solution to be jetted is separated from the above-mentioned Since it is difficult to form the jetted particles in the optimum range of , the jetted particles quickly settle. As a result, the amount of propelled particles is insufficient, making it difficult to knock down or kill the mosquitoes early.

<Aerosol for mosquito control>
The mosquito-controlling aerosol according to the present invention is mainly composed of a pressure-resistant container (aerosol container), a fixed quantity injection valve, and an injection button. As described above, pest control ingredients, organic solvents, propellants, and other ingredients to be blended as necessary are selected, sealed in a pressure-resistant container with a fixed quantity injection valve attached to the mouth, and an injection port is provided. The aerosol product is completed by connecting the injection button to the fixed injection valve. This aerosol product is the mosquito-controlling aerosol of the present invention, and the undiluted aerosol solution is sprayed as spray particles into the treatment space. The aerosol concentrate mainly contains pest control ingredients and organic solvents, and is strictly different from the propellant. In the following description, the aerosol content including the aerosol concentrate and the propellant may be referred to as the "aerosol concentrate".

<Fixed quantity injection valve>
FIG. 1 is a cross-sectional view of a constant injection valve 100 provided in a mosquito-controlling aerosol according to the present invention. A constant injection valve 100 is fixed to the mouth of the pressure container and connected to the injection button. The injection button is an operating part for injecting the aerosol stock solution, and the injection button is provided with an injection port for injecting the aerosol stock solution from the aerosol container to the outside (processing space). A constant injection valve 100 has a valve mechanism 10 including a stem 11 , a stem rubber 12 and a spring 13 , and a housing 20 that accommodates the valve mechanism 10 . A reinforced spring is adopted as the spring 13 . Acrylonitrile-butadiene rubber is used as the material of the stem rubber 12 . The lower alcohol having 2 to 3 carbon atoms used as the organic solvent in the mosquito-controlling aerosol of the present invention dries more quickly than other solvents such as higher fatty acid esters and evaporates quickly after spraying. Increases the concentration of pest control ingredients. In this respect, it is a highly useful solvent for fixed quantity injection type aerosol, but it may affect the operational stability of the fixed quantity injection valve after repeated use of the aerosol. One possible means of improving the operational stability of metered injection valves after repeated use is to modify the stem rubber material, but there are many factors involved in verifying the compatibility between the solvent and the stem rubber. Considering this point, in addition to (1) modifying the material of the stem rubber, (2) focusing on changing the structural specifications, we used acrylonitrile butadiene rubber as the material of the stem rubber and strengthened it as a spring. The inventors have found that the use of a spring can improve the operational stability of a fixed quantity injection valve, and have completed the present invention. The reinforcing spring is preferably a spring with a spring constant of 3.3 N/mm or more. where the spring constant is given by the following equation (1):
Spring constant (N/mm) = (modulus of lateral elasticity x 4th power of wire diameter) / (8 x number of effective turns x 3rd power of center diameter) (1)
can be calculated from Springs having a spring constant of 3.3 N/mm or more include, for example, a reinforced spring manufactured by Mitani Valve Co., Ltd. (product number: SP-C321). According to the catalog issued by Mitani Valve Co., Ltd., the conventional spring (product number: SP-C314) is made of stainless steel (SUS304), has a wire diameter of φ0.55 mm, and has 9 3/4 turns. On the other hand, the wire diameter of the reinforcing spring is increased from φ0.55 mm to φ0.6 mm to increase the spring pressure.

In the fixed quantity injection valve 100, when a predetermined amount of the undiluted aerosol solution is introduced from the pressure-resistant container into the fixed quantity chamber 21 and the injection button for the mosquito-controlling aerosol is pressed once, the fixed quantity injection valve 100 is pushed by the pressure of the propellant. The aerosol undiluted solution in the metering chamber 21 rises to the injection port and is injected into the processing space. The injection volume of the aerosol stock solution at this time is adjusted to 0.1 to 1.0 mL, preferably 0.1 to 0.2 mL. According to the mosquito control aerosol of the present invention, the acrylonitrile-butadiene rubber stem rubber and the reinforced spring work together to improve the operation stability of the fixed quantity injection valve and further stabilize the injection capacity of the undiluted aerosol solution. become. If the spray volume of the aerosol concentrate is within the above range, the sprayed particles formed from the sprayed aerosol concentrate can exhibit an optimal pest control effect in the treatment space. If the injection volume is less than 0.1 mL, the injection volume is too small and the amount of injected particles that move to the exposed portion in the processing space is small. It becomes difficult to knock down or kill resting mosquitoes. In addition, since the overall amount of sprayed particles is small, the number of sprayed particles floating in the treatment space is also small, making it difficult to knock down or kill mosquitoes flying in the treatment space. On the other hand, if the injection volume exceeds 1.0 mL, an excessive amount of the aerosol stock solution is discharged as injection particles into the treatment space, which may affect humans and pets. In addition, it is economically disadvantageous because the amount of the aerosol stock solution used is too large.

In addition, the injection amount of the insect pest control component is adjusted to 5.0 to 30 mg, preferably 6.1 to 25 mg per treatment space of 18.8 to 33.3 m ³ as described above. By the way, a space of ^18.8-33.3m3 is equivalent to a room of 4.5-8 tatami mats. Within such a range, the pest control effect can be adequately exhibited, and mosquitoes in the treatment space can be reliably knocked down or killed. If the injection amount of the pest control component is less than 5.0 mg, the amount of the sprayed particles adhering to the exposed part in the treatment space is small, so the effect of the pest control component is inferior and the mosquitoes perched on the exposed part are knocked down. Or it becomes difficult to exterminate them. On the other hand, when the injection amount of the insect pest control component exceeds 30 mg, an excessive amount of the pest control component is released into the treatment space, which may affect humans and pets. In addition, it is economically disadvantageous because the amount of the insect-controlling component used is too large.

The mosquito-controlling aerosol of the present invention has a jet force of 0.3 to 20.0 g·f, preferably 0.3 to 10.0 g·f at 25° C. at a distance of 20 cm from the jet nozzle. is adjusted to Within such a range, the sprayed particles sprayed from the spray nozzle in one spray can reach the exposed portion in the treatment space quickly, and the pest control component can exert its effect. Such an injection force can be appropriately adjusted depending on the composition of the aerosol stock solution, the internal pressure of the aerosol container, the shape of the nozzle hole, and the like. In this embodiment, the ejection force of the mosquito-controlling aerosol was measured using a digital force gauge (FGC-0.5, manufactured by Nidec-Shimpo Corporation). Furthermore, it is preferable to set the injection port diameter of the injection port to 0.2 to 1.0 mm. Within this range, the particle size and the ejection force can be appropriately adjusted, and the ejection particles are optimally formed from the aerosol stock solution ejected into the treatment space, and the pest control effect can be exhibited. Mosquitoes in the treatment space can be reliably knocked down or killed.

FIG. 2 is a model diagram showing the behavior of injected particles formed from the aerosol stock solution when the aerosol stock solution is injected into the processing space. FIG. 2(a) is a model diagram when a mosquito-controlling aerosol according to a conventional product is sprayed into a processing space, and FIG. It is a model diagram in the case of. As shown in FIG. 2( a ), the conventional aerosol product for controlling mosquitoes (simply referred to as “conventional product”) becomes particles M with a particle diameter of less than 10 μm when the aerosol undiluted solution is injected into the treatment space. to diffuse into the processing space. After a while from the injection, the particles M are further diffused throughout the treatment space, and the pest control component spreads throughout the treatment space. This can knock down or kill mosquitoes flying in the treatment space. However, as mentioned above, mosquitoes spend more time in the exposed part of the treatment space than in flight. cannot be knocked down or killed reliably. In addition, when the window of the processing space is opened and the wind blows in, some of the particles M floating in the processing space are blown away by the wind, which greatly reduces the effect of the pest control component. Furthermore, if the particles M remain suspended in the processing space for a long period of time, the amount of the particles M inhaled by the person or pet in the processing space increases, which may adversely affect the human body or pet. Accordingly, the present inventors have developed a novel mosquito control aerosol product that solves these problems. In the following, the jetted particles that are characteristic of the mosquito-controlling aerosol product according to the present invention will be described.

[Injection particles]
As shown in FIG. 2(b), when the undiluted aerosol solution is injected into the processing space once, jetted particles R are formed from the undiluted aerosol solution. The jetted particles R quickly move and adhere to the exposed portion in the processing space. Here, among the ejected particles R, the ejected particles R in a state of adhering to the exposed portion are defined as particles X (indicated by white circles in FIG. 2B). means the sprayed particles R attached to the part.). On the other hand, the jetted particles R that are floating in the processing space without adhering to the exposed portion are defined as particles Y (indicated by black circles in FIG. out of which, the ejected particles R that do not adhere to the exposed portion and are floating in the processing space”). A preferable particle diameter for the ejected particles R to move and adhere to the exposed portion (that is, to exist as particles X) is 10 to 80 μm in the 90% particle diameter in the volume integrated distribution at 25° C. and the ejection distance of 15 cm. . Within such a range, the injected particles R injected into the processing space reliably move and adhere to the exposed portion in the processing space to become particles X, as shown in FIG. 2(b). As a result, mosquitoes resting on the exposed area can be knocked down or killed by the pest control component of the propellant particles. In addition, it is also possible to expel mosquitoes that have invaded the processing space and are trying to perch on the exposed portion to the outside of the processing space because they are effective in controlling insect pests. When the particle diameter of the sprayed particles R is less than 10 μm, the particle diameter is too small, and the amount of the sprayed particles R reaching the exposed portion is reduced. For this reason, it becomes difficult to control mosquitoes that have landed or are about to land on the exposed portion. On the other hand, if the particle diameter exceeds 80 μm, the particle diameter is too large to control the behavior of the sprayed particles R, making it difficult to appropriately adhere to the exposed portion. A more preferable particle size of the sprayed particles R is 25 to 70 μm in 90% particle size distribution at 25° C. and a spray distance of 15 cm. In FIG. 2B, for convenience of explanation, the particles X and Y are indicated by white circles and black circles, respectively, in order to distinguish between the particles X and Y. Particles derived from R. In this embodiment, the 90% particle size of the sprayed particles of the mosquito-controlling aerosol at 25° C. and the spray distance of 15 cm in the volume-integrated distribution was measured by Spraytech (STP5321, manufactured by Malvern).

Further, a preferable adhesion amount of the sprayed particles R to the exposed portion in the processing space is 0.01 to 0.4 mg per 1 m ² of the exposed portion, preferably 0.05 to 0.2 mg per 1 m ² . . Within such a range, mosquitoes resting on the exposed portion can be effectively knocked down or killed. If the adhered amount is less than 0.01 mg/m ² , a sufficient control effect cannot be obtained against mosquitoes resting on exposed portions, making it difficult to knock down or kill mosquitoes. On the other hand, even if the adhered amount exceeds 0.4 mg per 1 m ² , the pest control effect is not greatly improved, and the amount of the aerosol stock solution used becomes excessive, which is economically disadvantageous.

It should be noted that the particles Y, like the particles X described above, can exhibit pest control effects against mosquitoes. Particles Y cannot knock down or kill mosquitoes resting on the exposed area, but can effectively knock down or kill mosquitoes flying in the treatment space. Moreover, since it is also effective against mosquitoes that try to enter the processing space, it is possible to prevent them from entering the processing space. In this way, the injected particles R injected into the processing space exist in the state of the particles X or the particles Y, and the mosquitoes in the processing space can be effectively knocked down or killed by making use of the respective states. can be done.

As described above, immediately after the aerosol undiluted solution is injected into the processing space once, the injected particles R quickly move to the exposed portion in the processing space, and the particles X in the adhered state and the exposed portion are processed without being adhered. Particles Y are floating in space. The particles X remain attached to the exposed portion even after a while from the single injection, and the pest control component can knock down or kill mosquitoes resting on the exposed portion. On the other hand, the particles Y spread evenly throughout the treatment space, and the insect-controlling component gradually volatilizes, thereby knocking down or killing mosquitoes flying in the treatment space. In addition, it is possible to prevent mosquitoes from entering the treatment space. Even in the unlikely event that the mosquito invades the processing space, if the mosquito stops at the exposed portion in the processing space or approaches the vicinity of the exposed portion, the insect pest of the particle X adhering to the exposed portion Controlling components can reliably knock down or kill. Thus, in the mosquito-controlling aerosol according to the present invention, the injected particles R injected from the injection port exist in the optimum state (particle X and particle Y state), and the pest control effect is maximized. be able to. Therefore, it can be said to be a useful product capable of exerting an excellent control effect against both mosquitoes existing in the treatment space and mosquitoes trying to invade the treatment space.

Further, when the wind blows into the processing space, even if some of the particles Y are blown away by the wind, there are particles X adhering to the exposed portions. As described above, most of the mosquitoes present in the treatment space spend a longer time in the exposed area. , There is no concern that the control effect against mosquitoes will be inferior. Furthermore, in the mosquito-controlling aerosol of the present invention, substantially all of the jetted aerosol undiluted solution does not diffuse into the treatment space, unlike conventional products. The concentration of the pest control component (that is, the pest control component by the particles Y) diffused in the treatment space is reduced by the amount of the particles X. Therefore, the concentration in the treatment space is lower than that of conventional products, and the effects on humans and pets due to inhalation of pest control components are reduced, so that the product can be provided as a safe product.

When the undiluted aerosol solution is injected once into the treatment space by the mosquito-controlling aerosol of the present invention, the duration of the effect of the insect-controlling component is preferably 18 hours or longer, more preferably 18 hours or longer, for a space of 33.3 m ³ or less. 20 hours or more. Spaces of 33.3 m ³ or less include living rooms of 4.5 to 8 tatami mats (ceiling height of 2.5 m), as described above. Therefore, with the mosquito-controlling aerosol according to the present invention, the pest-controlling effect can be maintained for approximately one day in a normal living space such as a general house. Mosquitoes invade indoors day and night, and it is particularly necessary to prevent mosquitoes from sucking blood during sleep. In the case of the mosquito-controlling aerosol according to the present invention, the effect of the insect-controlling component lasts for 20 hours or longer. and you can go to bed with peace of mind.

<Mosquito control method>
The mosquito control method of the present invention is carried out using the mosquito control aerosol described above. First, there is provided a metered injection valve containing an aerosol undiluted solution containing transfluthrin and/or methofluthrin, which are pest control components, and a lower alcohol and/or hydrocarbon solvent used as an organic solvent, and a propellant. In the pressure container, when an injection button provided with an injection port connected to a constant injection valve is pressed once, the aerosol undiluted solution is injected from the injection port into the processing space as injection particles R (injection step). At this time, as shown in FIG. 2B, the sprayed particles R quickly move to the exposed portion in the processing space, and the particles X that adhere to the exposed portion and the particles that do not adhere to the exposed portion remain in the processing space. becomes a particle Y in a state of floating. Particles X among sprayed particles R knock down or kill mosquitoes that are perched on surfaces such as walls, floors, and structures in the treatment space, or kill mosquitoes that try to perch on these places. also has an effect and drives it out of the processing space. On the other hand, the particles Y among the sprayed particles R can knock down or kill mosquitoes flying in the treatment space, and are also effective against mosquitoes trying to enter the treatment space. Suppress intrusion into the space. The pest control effect of the sprayed particles R as described above lasts for a long time of 18 hours or more, preferably 20 hours or more, in a space of 33.3 m ³ or less. After the predetermined time has passed, the undiluted aerosol solution can be sprayed into the treatment space again, thereby continuously knocking down or killing mosquitoes.

In the mosquito-controlling aerosol according to the present invention, as described above, the duration of the effect of the insect-controlling component is 18 hours or more, preferably 20 hours or more, that is, about 1 day in a space of 33.3 m ³ or less. . Therefore, in the mosquito control method using this mosquito control aerosol, the operation can be completed only by executing the injection step of injecting once a day at a fixed time. In this way, anyone can easily inject the undiluted aerosol solution into the processing space, and it is possible to prevent missing the injection timing.

Regarding the mosquito-controlling aerosol of the present invention, in order to confirm the operation stability of the fixed-quantity injection valve after repeated use and the mosquito-controlling effect, the mosquito-controlling aerosol having the characteristic configuration of the present invention (Example 1- 13) was prepared and tested. For comparison, mosquito control aerosols (Comparative Examples 1 to 6, Reference Examples 1 and 2) not having the features of the present invention were prepared and subjected to similar tests.

As Examples 1 to 13, mosquito control aerosols were prepared with the compositions and conditions shown in Table 1, and the following tests were performed. In Example 2, IPM (15% by weight) was blended as a desensitization aid, and in Example 3, 1,3-butylene glycol (15% by weight) was blended as a desensitization aid. , Example 5, IPM (10% by weight) was blended as a desensitization aid. For Comparative Examples 1 to 6 and Reference Examples 1 and 2, mosquito control aerosols were prepared with the compositions and conditions shown in Table 1, and the same tests as in Examples were conducted. Acrylonitrile-butadiene rubber was used as the material for the stem rubber of the metered injection valve in any of the mosquito-controlling aerosols. In addition, in the mosquito-controlling aerosols of Comparative Examples 1 and 2, the conventional spring ("A" in Table 1, wire diameter 0.55 mm, lateral elastic modulus 6.85 × 10 ⁴ , center diameter 3.5 mm) was used as the spring. 15 mm, effective number of turns 7.75, spring constant 3.24 N / mm), in the mosquito control aerosols of Examples 1 to 13, Comparative Examples 3 to 6, and Reference Examples 1 and 2, the reinforced spring (Table 1 "B" in the middle, wire diameter 0.6 mm, lateral elastic modulus 6.85×10 ⁴ , center diameter 3.2 mm, effective number of turns 8, spring constant 4.23 N/mm) was used.

(1) Operational stability of fixed-quantity injection valve after repeated use Repeated use of the test mosquito control aerosol was used to examine the return state of the injection button, and the operation stability of the fixed-quantity injection valve after repeated use was evaluated as follows. Evaluated according to the standard.
a: No change in the return state of the injection button even after 20 or more uses b: The return state of the injection button deteriorated after 3 to 7 uses c: The return state of the injection button deteriorated significantly after 1 to 2 uses

(2) Control effect on adult mosquitoes In the center of a closed 25 m ³ room, an aerosol for controlling mosquitoes was sprayed once diagonally upward, and immediately after this, 50 Culex pipiens female adults were released and exposed for 2 hours. Afterwards, all test mosquitoes were collected. In the meantime, the Culex pipiens female adults that fell and turned upside down were counted with the passage of time, and the _KT50 value (minutes) was determined. In the same room, the same operation was performed 12 hours and 18 hours after one injection of mosquito control aerosol. In Examples 1 to 10, Comparative Examples 1 to 6, and Reference Examples 1 and 2, two types of Culex pipiens female adults, a pyrethroid-sensitive strain and a pyrethroid-resistant strain, were used. In Examples 11-13, Culex pipiens female adults used only pyrethroid-susceptible strains.

(3) Survival Rate of Sprayed Particles in Air Towards the center of a closed room of 25 m ³ , a mosquito-controlling aerosol was sprayed diagonally upward once. 50 cm behind the center of the room (130 cm from the wall) and 120 cm above the floor, install an air collection tube (a glass tube filled with silica gel and stuffed with absorbent cotton at both ends), and connect it to a vacuum pump for spraying. After 2 hours had passed since then, a predetermined amount of air was sucked. The air collection tube was washed with acetone, and the amount of collected pest control components was analyzed by gas chromatography (manufactured by Shimadzu Corporation, model GC1700). Based on the obtained analytical values, the air concentration (weight basis) of the pest control component was calculated, and the ratio to the theoretical air concentration was determined as the air persistence rate.

Table 2 shows the test results of (1) to (3) above.

In Examples 1 to 13, in which a reinforced spring with a spring constant of 3.3 N/mm or more was used in the fixed quantity injection valve, there was no change in the return state of the injection button even after 20 or more uses, and fixed quantity injection after repeated use was performed. The operation stability of the valve was good. On the other hand, in Comparative Examples 1 and 2, in which a conventional spring with a spring constant of less than 3.3 N/mm was used for the fixed quantity injection valve, the return state of the injection button deteriorated after 3 to 7 times of use, and after repeated use. It could not be said that the operation stability of the fixed quantity injection valve was particularly good. Also, as in Comparative Example 3, even if a reinforced spring with a spring constant of 3.3 N/mm or more was used, when methyl ethyl ketone was used as the organic solvent, the return state of the injection button after 1-2 times of use. It became very bad, and there was a possibility that it would lead to an injection failure. This is probably because methyl ethyl ketone deteriorated the acrylonitrile-butadiene rubber and reduced the elasticity of the stem rubber. Thus, the compatibility between the material of the stem rubber and the organic solvent is an extremely important item to consider. It was found that if it had an adverse effect, the operation stability of the metered injection valve after repeated use could not be improved.

Regarding the control effect against adult mosquitoes, in Examples 1 to 13, the KT ₅₀ value was significant even 18 hours after a single injection of a mosquito control aerosol containing transfluthrin and/or metofluthrin as an insect control component. It was confirmed that it was maintained at a reasonable value and exhibited an excellent mosquito control effect. Further, Example 1 using ethanol as an organic solvent, Example 4 using isopropanol as an organic solvent, and Example 10 using neothiosol as an organic solvent have the same amount of transfluthrin. Since the mosquito control effect of Examples 1 and 4 is excellent, and the mosquito control effect of Example 1 is particularly excellent, the organic solvent to be combined with the insect control component transfluthrin is a lower alcohol and / or a hydrocarbon Among the system solvents, lower alcohols having 2 to 3 carbon atoms (ethanol or isopropanol) were found to be effective, and ethanol was found to be more effective.

Further, Example 1, which does not contain a desensitization aid, and Examples 2 and 3, which contain a desensitization aid, have the same amount of transfluthrin, but Examples 2 and 3 , even against Culex pipiens, a pyrethroid-resistant line whose sensitivity to pyrethroid-based compounds has been reduced, the reduction in control efficacy was smaller than in Example 1 compared to the pyrethroid-sensitive line. For this reason, the addition of higher fatty acid esters such as isopropyl myristate and glycols having 3 to 6 carbon atoms such as 1,3-butylene glycol as susceptibility aids is effective for pyrethroid-resistant strains. It was confirmed that it is extremely effective in controlling mosquitoes. In Reference Examples 1 and 2 in which profluthrin was used as the pest control component, the control effect against Culex pipiens by the pyrethroid-resistant line was significantly inferior to that of the pyrethroid-susceptible line, and the degree of this decrease was even greater when isopropyl myristate was used. There was no improvement even after mixing. Therefore, transfluthrin is still effective against pyrethroid-resistant mosquitoes, and higher fatty acid esters such as isopropyl myristate and carbon number 3-6 such as 1,3-butylene glycol have also been found to be specifically useful as desensitization aids when combined with transfluthrin as a pest control ingredient.

On the other hand, in Comparative Example 3 using methyl ethyl ketone as the organic solvent, the KT ₅₀ value was 120 minutes or more 18 hours after one injection of the mosquito-controlling aerosol, and the mosquito-controlling effect was maintained for a long time. It was not something that could be demonstrated. Comparative Examples 4 and 5 in which the volume ratio (a/b) of the aerosol stock solution (a) and the propellant (b) was out of the range of 6/94 to 50/50, and the injection when the injection button was pressed once In Comparative Example 6, in which the volume was outside the range of 0.1 to 1.0 mL, the KT ₅₀ value was 120 minutes or more 12 hours after one injection of the mosquito control aerosol, and the control effect against mosquitoes was demonstrated. It didn't last long.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an aerosol for controlling mosquitoes, which has a high control effect on mosquitoes, and a method for controlling mosquitoes using the same.

10 valve mechanism 11 stem 12 stem rubber 13 spring (reinforced spring)
20 Housing 21 Metering Chamber 100 Metering Injection Valve R Injected Particles X Injected Particles Adhering to Exposed Part Y Injected Particles Floating in Processing Space

Claims (9)

an aerosol undiluted solution containing transfluthrin and/or methofluthrin, which are pest control components, and an organic solvent consisting of a lower alcohol and/or a hydrocarbon solvent;
a constant injection valve having a valve mechanism including a stem, a stem rubber, and a spring, and a housing accommodating the valve mechanism, and assembled to the mouth of the pressure vessel;
an injection button provided with an injection port connected to the fixed quantity injection valve;
A mosquito control aerosol comprising:
The volume ratio (a/b) between the aerosol stock solution (a) and the propellant (b) is 6/94 to 50/50,
The material of the stem rubber is acrylonitrile butadiene rubber,
the spring is a reinforced spring;
the stem passes through the inner side of the helix of the reinforcing spring;
The injection volume when the injection button is pressed once is 0.1 to 1.0 mL,
The particle diameter of the injected particles injected from the injection port is 10 to 80 μm in the 90% particle diameter in the volume integrated distribution at 25 ° C. and the injection distance of 15 cm,
The aerosol for controlling mosquitoes , wherein the reinforcing spring is a spring having a spring constant of 3.3 N/mm or more . 2. The mosquito control aerosol of claim 1 , wherein said pest control component is transfluthrin. When the aerosol undiluted solution is injected into the treatment space once, the pest control component has a residual rate of 0.05 to 5% in the air after 2 hours, and the effect duration of the pest control component is 33.3 m. ^3. The aerosol for controlling mosquitoes according to claim 1 or 2, which is 18 hours or more for 3 or less spaces. 4. The method according to any one of claims 1 to 3, wherein the particle diameter of the injected particles injected from the injection port has a 90% particle diameter of 25 to 70 μm in a volume integrated distribution at 25° C. and an injection distance of 15 cm. Aerosol for mosquito control. The mosquito-controlling aerosol according to any one of claims 1 to 4, wherein the injection volume when the injection button is pressed once is 0.1 to 0.2 mL. 6. The method according to any one of claims 1 to 5, wherein the injection amount of the pest control component when the injection button is pressed once is 5.0 to 30 mg per treatment space of 18.8 to 33.3 m ³ . Aerosol for mosquito control. The mosquito-controlling aerosol according to any one of claims 1 to 6, wherein the organic solvent is a lower alcohol having 2 to 3 carbon atoms. 8. The aerosol stock solution according to any one of claims 2 to 7, which contains a higher fatty acid ester having a total number of carbon atoms of 13 to 20 and/or a glycol having a carbon number of 3 to 6 as an aid for reducing sensitivity to transfluthrin. or an aerosol for controlling mosquitoes according to claim 1 . A mosquito control method comprising using the mosquito control aerosol according to any one of claims 1 to 8 and injecting the aerosol undiluted solution into a treatment space to knock down or kill mosquitoes.

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