JP6633280B2 - Mosquito control aerosol and mosquito control method - Google Patents

Description

  The present invention relates to an aerosol stock solution containing a pest-controlling component and an organic solvent, and a pressure-resistant container provided with a metering injection valve enclosing a propellant, and a jet provided with an injection port connected to the metering valve. The present invention relates to a mosquito controlling aerosol having a button and a mosquito controlling method using the same.

  As a method of exterminating flying pests, for example, a method in which a drug is vaporized from a carrier impregnated with a drug containing an insecticidal component and volatilized into a treatment space, a method in which a drug is directly sprayed on the flying pest, or a place where the flying pest is likely to appear There is a method of spraying a medicine in advance. Regarding these methods, an aerosol insecticide containing an insecticidal component has been developed as a product for controlling flying pests that enter indoors. Aerosol insecticides are widely used as easy-to-use products because they can easily spray insecticide components into the processing space.

  Conventionally, there has been an aerosol insecticide that suppresses a decrease in the residual ratio of the drug in the air in a room (for example, see Patent Document 1). According to Patent Literature 1, after releasing a drug, the drug is kept in the air to suppress a decrease in air concentration, whereby a sufficient control effect on mosquitoes lurking in the shade can be maintained. I have.

  In addition, there is an aerosol insecticide in which the particle size when a medicine is sprayed into a room is set to be larger than that of Patent Document 1 (for example, see Patent Document 2). Patent Literature 2 is an aerosol insecticide based on the same technical concept as Patent Literature 1, in which the chemical is allowed to remain in the indoor air for as long as possible to enhance the insecticidal effect on mosquitoes.

  On the other hand, with respect to aerosol insecticides, there has been a method of controlling flying pests in a house room, which is characterized by being attached to the surface of a structure or equipment in a room (for example, see Patent Document 3). According to Patent Literature 3, since a specific compound attached to an indoor structure or the like evaporates, repeated spraying or continuous operation of an electric appliance or the like is not required, and indoor flying pests can be performed by simple means. Is said to be able to be exterminated efficiently.

JP 2001-17055 A JP 2013-99336 A JP 2001-328913 A

  The aerosol insecticide disclosed in Patent Literature 1 has attempted to increase the duration of the drug remaining in the air by adjusting the particle size of the drug that diffuses into the room, and to lengthen the duration of the drug. However, the aerial residual ratio of drug particles after 12 hours from the start of the treatment is 0.5% or more, and the aerosol insecticide of Patent Document 1 for maintaining the aerial residual ratio has a limit in duration. is there. Also in Patent Document 2, the aerial residual ratio of drug particles is similar to that of Patent Document 1, and is not an aerosol insecticide that can be expected to have a long duration.

  Here, among the mosquitoes to be controlled (including not only common mosquitoes such as Culex pipiens and Aedes albopictus, but also Chironomidae and Drosophila etc.), Culex pipiens and Aedes albopictus are particularly blood-sucking. Because they are mosquitoes that not only transmit but also transmit infectious diseases, it is necessary to protect themselves from these mosquitoes, and there is a need to establish more effective control methods than ever before. Because mosquitoes are flying pests that enter indoors day or night, insecticides that are effective all day, that is, 24 hours in duration, are ideal.

  However, as described above, the effects of the aerosol insecticides disclosed in Patent Literature 1 and Patent Literature 2 last only for about 12 hours. In addition, Patent Documents 1 and 2 disclose that the drug is positively left in the air by adjusting the particle size of the drug. However, it does not mean that the drug particles remain in the air. This means that a person or a pet in the processing space is placed in an environment in which the medicine is inhaled for a long time. Therefore, it is hard to say that it is a preferable aerosol insecticide in terms of the effect on the human body and pets.

  It is unclear whether a stable effect can be maintained for a long time also in the extermination method of Patent Document 3. The drug particles injected into the air are (A) suspended and remaining in the air, (B) adhere to floors and walls, (C) volatilize again after (B), or (D) are decomposed by light or the like And then disappear. In light of these, the extermination method of Patent Document 3 corresponds to the type (C). However, when the chemicals attached to the indoor structure and the like are vaporized again into the air, they are easily affected by temperature, air volume, and the like. Therefore, the control method of Patent Document 3 has a stable effect on the control of flying pests. Not always.

  The present invention has been made in view of the above problems, and among flying pests, in particular, it can exert an excellent control effect on mosquitoes over a long period of time, and furthermore, it has been applied to humans and pets. It is an object of the present invention to provide a mosquito controlling aerosol in which the effect of mosquito control is reduced and 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,
An aerosol stock solution containing a pest control component and an organic solvent, and a pressure-resistant container provided with a metering injection valve enclosing a propellant,
An injection button provided with an injection port connected to the fixed-quantity injection valve,
A mosquito control aerosol provided with
The ejection capacity when the ejection button is pressed once is 0.1 to 0.4 mL, and the ejection force at an ejection distance of 20 cm is adjusted to be 0.3 to 10.0 g · f at 25 ° C.,
The aerosol stock solution is sprayed from the spray port as adhesive particles at least partially adhered to an exposed portion in the processing space.

As described in "Problems to be Solved by the Invention", conventional aerosol insecticides are being developed to actively diffuse drug particles into the treatment space and extend the time remaining 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, if people or pets enter the processing space, there is a possibility that the drug particles may be inhaled. You.
By the way, according to the study of the present inventors, mosquitoes represented by mosquitoes (hereinafter, simply referred to as “mosquitoes” in the present invention) are more likely to be on the wall or the like than on the flight. Turned out to be longer. In other words, most of the mosquitoes that have entered indoors remain on the walls and the like, and are looking for opportunities to suck blood. For this reason, the method of extending the time during which the drug particles in the treatment space float as in the conventional method can have a certain effect on controlling mosquitoes in flight, but only on the wall surface or the like. Mosquitoes may not be able to exert the full potential of the drug, resulting in incomplete mosquito control. From the above research results, the present inventors have found that enhancing the control effect of mosquitoes on a wall or the like can prevent mosquitoes entering indoors while suppressing inhalation of drugs by humans and pets. It was thought that it would lead to the improvement of the control of the whole kind.
Therefore, in the mosquito control aerosol according to the present invention, at least a part of the aerosol stock solution injected into the processing space is exposed to the exposed portion in the processing space (for example, a floor surface, a wall surface, furniture, etc. existing in the processing space). (The surface of a structure, etc.). For this reason, it is possible to effectively knock down or kill both mosquitoes remaining in the exposed part and mosquitoes flying in the treatment space, and improve the control effect of the entire mosquito. it can. Also, even if particles other than the adherent particles (hereinafter referred to as “floating particles”) are diffused throughout the processing space, the concentration of the aerosol stock solution in the processing space is only the amount of the adherent particles. Reduced. Therefore, the amount of the aerosol stock solution particles inhaled by a person or pet in the processing space is extremely small, and the mosquito control aerosol is safer for the human body and pet.
The mosquito control aerosol according to the present invention has a spray volume of 0.1 to 0.4 mL when the spray button is pressed once, and a spray force at a spray distance of 20 cm of 0.3 to 10 at 25 ° C. It is adjusted to be 0.0 g · f. By adjusting the injection capacity and the injection force in this manner, at least a part of the injected aerosol stock solution can be formed as adherent particles, and an excellent control effect on mosquitoes can be achieved.

In the mosquito control aerosol according to the present invention,
The adhesive particles preferably have a 90% particle diameter of 20 to 80 μm in a volume integrated distribution at 25 ° C. and a spray distance of 15 cm.

  According to the mosquito control aerosol of this configuration, by adjusting the adhesive particles to the above-mentioned optimum range, the mosquitoes remaining on the exposed portion are reliably knocked down or killed by the insect-controlling component of the adhesive particles. Can be done.

In the mosquito control aerosol according to the present invention,
It is preferable that the adhesion amount of the adhesive particles is 0.01 to 0.4 mg per 1 m ^{2 on} the exposed portion in the processing space.

  According to the mosquito control aerosol of this configuration, by adjusting the amount of the adhered particles to be within the above-described optimum range, the mosquitoes remaining on the exposed portion are reliably knocked by the insect-controlling component of the adhered particles. Can be down or killed.

In the mosquito control aerosol according to the present invention,
The volume ratio (a / b) between the aerosol stock solution (a) and the propellant (b) sealed in the pressure-resistant container is preferably 10/90 to 50/50.

  According to the mosquito control aerosol of this configuration, when the volume ratio (a / b) between the aerosol stock solution (a) and the propellant (b) is within the above range, the adhesion formed from the aerosol stock solution to be sprayed. Sex particles are in an optimal state. Thereby, the adhesive particles can reliably reach the exposed portion in the processing space, and the floating particles can float in the processing space in such an amount that does not affect the human body or pet.

In the mosquito control aerosol according to the present invention,
The organic solvent is preferably at least one selected from the group consisting of higher fatty acid esters and alcohols.

  According to the mosquito control aerosol of this configuration, the organic solvent is at least one selected from the group consisting of higher fatty acid esters and alcohols. By using such an organic solvent, the effect of each component can be efficiently exhibited. In addition, when the aerosol stock solution is sprayed, the adherent particles can be formed in a well-balanced manner, and the control effect against mosquitoes becomes stable.

In the mosquito control aerosol according to the present invention,
It is preferable that the pest controlling component has a vapor pressure at 30 ° C. of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg.

According to the mosquito control aerosol of this configuration, a component having a vapor pressure of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg at 30 ° C. is employed as the pest control component. With such a pest controlling component, when the aerosol stock solution is sprayed, the adherent particles can be formed in an optimal state. When prepared with each component other than the insect-controlling component, the organic solvent and the propellant, an effective aerosol for controlling mosquitoes can be realized.

In the mosquito control aerosol according to the present invention,
When the aerosol stock solution is injected once into the treatment space, the duration of the effect of the pest control component is preferably 20 hours or more for a space of 33 m ³ or less.

In the method of controlling mosquitoes with an aerosol insecticide disclosed in Patent Documents 1 and 2, the duration of the drug was set to 12 hours. However, with the mosquito control aerosol according to the present invention, the aerosol stock solution is sprayed only once into the treatment space, and the space of 33 m ³ or less is used for 20 hours or more, that is, almost one day pest control effect. Can be maintained.

In the mosquito control aerosol according to the present invention,
It is preferable that the injection port has an injection port diameter of 0.2 to 1.0 mm.

  According to the mosquito control aerosol of this configuration, the nozzle diameter is set in the above optimum range, so that the particle diameter of the aerosol stock solution and the spraying power can be appropriately adjusted, and the adhesive particles are optimized. It can be formed in a suitable state. As a result, the effect of the pest control component can be exhibited.

The characteristic configuration of the mosquito control method according to the present invention for solving the above-mentioned problems,
It is to knock down or kill mosquitoes by spraying the aerosol stock solution into a treatment space using the mosquito control aerosol according to any one of the above.

  Since the mosquito control method of this configuration is carried out using the mosquito control aerosol of the present invention, the same excellent mosquito control effect as the mosquito control aerosol described above can be obtained.

In the mosquito control method according to the present invention,
Preferably, the injection of the aerosol stock solution into the processing space is performed once every 24 hours.

  As described above, the mosquito control aerosol according to the present invention has a duration of the pest control component of 20 hours or more, and is approximately one day. Therefore, using the mosquito control aerosol, the injection of the aerosol stock solution into the processing space can be executed once every 24 hours. If such a mosquito control method is executed, the pest control effect can be maintained over the life time zone only by spraying once a day at a fixed time.

FIG. 1 is a model diagram showing the behavior of particles of the aerosol stock solution when the aerosol stock solution is injected into the processing space.

  The aerosol for controlling mosquitoes of the present invention is a pressure-resistant container provided with a fixed-amount injection valve enclosing an aerosol stock solution containing a pest-controlling component and an organic solvent, and a propellant, and an injection connected to the fixed-amount injection valve. A jet button provided with a mouth. Hereinafter, the aerosol for controlling mosquitoes of the present invention will be described. However, the present invention is not intended to be limited to the embodiments described below and the configurations described in the drawings.

<Aerosol stock solution>
[Pest control ingredients]
As the pest controlling component, which is one of the main components of the aerosol stock solution, one having a vapor pressure of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg at 30 ° C. is used. Metofluthrin, transfluthrin and the like are suitably selected as such pest control components. These pest control components can be used either alone or in a mixed state. It should be noted that, for metofluthrin and transfluthrin, optical isomers and geometric isomers based on asymmetric carbon exist, which are also included in the present invention.

  The content of the pest control component in the aerosol stock solution is preferably 1.0 to 50% by weight in consideration of being dissolved in an organic solvent and then injected into the treatment space. Within such a range, the pest control component is easily dissolved in the organic solvent, and when the aerosol stock solution is sprayed, at least a part is formed as adhesive particles, and particles other than the adhesive particles are floating particles. (Adhesive particles and floating particles will be described later in detail). When the content of the pest control component in the aerosol stock solution is less than 1.0% by weight, the pest control component cannot be effectively exhibited, and the mosquito control effect becomes insufficient. On the other hand, when the content of the pest control component in the aerosol stock solution exceeds 50% by weight, the concentration of the pest control component becomes high, so that it becomes difficult to appropriately prepare the aerosol stock solution.

As described above, the pest control component contained in the mosquito control aerosol of the present invention has a vapor pressure of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg at 30 ° C. (methfluthrin, transfluthrin, etc.). Are preferred, in addition to these components, profluthrin, pyrethroid compounds such as empentrin, phthalthrine, resmethrin, cyfluthrin, phenothrin, permethrin, cyphenothrin, cypermethrin, allesulin, praletrin, flamemetry, imiprothrin, etofenprox, etc. Pyrethroids, silicon compounds such as silafluofen, organic phosphorus compounds such as dichlorvos and fenitrothion, and carbamate compounds such as propoxur.

The insect-controlling component is adjusted so that, when the aerosol stock solution is injected once into the processing space, the residual ratio in the air (in the processing space) after 2 hours is 0.05 to 5%. The residual ratio in the air is a ratio of the number of particles (Q) existing in the processing space after a predetermined time has elapsed to the number (P) of particles existing in the processing space immediately after the injection, that is, Q / P × 100 (%). It can be simply determined from the theoretical air concentration of the pest control component and the air concentration of the pest control component after a lapse of a predetermined time, as described in Examples below. At this time, the injection amount of the pest control component is adjusted to 5.0 to ³⁰ mg per 4.5 to 8 tatami mats (about 18.5 to 33.0 m3). Within such a range, the adhesive particles are formed in an optimal state by the aerosol stock solution, and the pest control effect can be exhibited. In addition, even with a relatively low residual rate as described above, mosquitoes can be effectively knocked down or killed. Furthermore, even if a person or pet in the processing space inhales, there is no risk of influencing the human body or pet, and it can be used safely.

[Organic solvent]
The organic solvent which is another main component of the aerosol stock solution can prepare the aerosol stock solution by dissolving the above-mentioned pest control components, and when the prepared aerosol stock solution is sprayed into the processing space, optimal particles are obtained. What can be formed is used. As the organic solvent, higher fatty acid esters and alcohols are preferable. As the higher fatty acid ester, those having a total of 16 to 20 carbon atoms are preferable, and examples thereof include isopropyl myristate, butyl myristate, hexyl laurate, and isopropyl palmitate. Of these, isopropyl myristate is particularly preferred. As the alcohols, lower alcohols having 2 to 3 carbon atoms are preferable. For example, hydrocarbon solvents such as n-paraffin and isoparaffin, glycol ethers having 3 to 6 carbon atoms, and ketone solvents can be mixed with the organic solvent.

[Other ingredients]
The mosquito control aerosol of the present invention, in addition to the above components, acaricides, fungicides, fungicides, fungicides, fragrances, deodorants, stabilizers, fungicides, fungi, etc. Inhibitors, defoamers, excipients and the like can be appropriately compounded. Examples of the acaricide include methyl 5-chloro-2-trifluoromethanesulfonamidobenzoate, phenyl salicylate, 3-iodo-2-propynylbutylcarbamate and the like. Hinokitiol, 2-mercaptobenzothiazole, 2- (4-thiazolyl) benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, trifolin, 3 -Methyl-4-isopropylphenol, ortho-phenylphenol and the like. As the fragrance, orange oil, lemon oil, lavender oil, peppermint oil, eucalyptus oil, citronella oil, lime oil, yuzu oil, jasmine oil, hinoki oil, green tea essential oil, limonene, α-pinene, linalool, geraniol, phenylethyl Aromatic components such as alcohol, amylcinnamic aldehyde, cumin aldehyde, and benzyl acetate, and perfume components containing green alcohol and green aldehyde, which are referred to as “green scent”, are included.

<Propellant>
Examples of the propellant used in the mosquito control aerosol of the present invention include liquefied petroleum gas (LPG), dimethyl ether (DME), nitrogen gas, carbon dioxide gas, nitrous oxide, and compressed air. The above propellants can be used alone or in a mixed state, but those containing LPG as a main component are easy to use.

  The mosquito control aerosol of the present invention is adjusted so that the volume ratio (a / b) of the aerosol stock solution (a) and the propellant (b) is 10/90 to 50/50. By adjusting to such a range, at least a part of the aerosol stock solution can be formed as adhesive particles. Thereby, the adhesive particles can reliably reach the exposed portion in the processing space, and the floating particles can float in the processing space in such an amount that does not affect the human body or pet. Thus, the adherent particles are present in an optimal state, and the pest control effect can be maximized. When the ratio of the propellant (b) is increased with respect to the volume ratio (a / b) of 10/90, that is, when the amount of the propellant sealed in the pressure-resistant container is increased, the undiluted aerosol solution becomes unnecessary. Due to the miniaturization, the number of adhesive particles is reduced. As a result, there is a shortage of adherent particles adhering to the exposed portion in the processing space, and it may not be possible to reliably control mosquitoes remaining at the exposed portion. On the other hand, when the ratio of the propellant (b) is reduced with respect to the volume ratio (a / b) of 50/50, that is, when the propellant sealed in the pressure-resistant container is reduced to a small amount, the aerosol stock solution to be jetted is converted The aerosol stock solution sediments as soon as it is sprayed, because it is difficult to form as adhering particles having a particle size in the optimum range. Therefore, the amount of the adhered particles adhering to the exposed portion in the processing space becomes insufficient in quantity, and it is difficult to knock down or kill mosquitoes early.

<Aerosol for controlling mosquitoes>
As described above, an aerosol product is completed by selecting a pest controlling component, an organic solvent, a propellant, and other components to be blended as necessary, and enclosing these components in a pressure-resistant container. This aerosol product is the aerosol for controlling mosquitoes of the present invention, and injects an aerosol stock solution into a treatment space. The aerosol stock solution is mainly composed of a pest control component and an organic solvent and is strictly different from the propellant, but the aerosol stock solution is released outside the pressure-resistant container at the same time as the propellant. Therefore, in the following description, the aerosol content including the aerosol stock solution and the propellant may be treated as “aerosol stock solution”. Here, the injection valve provided in the mosquito control aerosol according to the present invention will be described. The aerosol for controlling mosquitoes according to the present invention mainly includes a pressure-resistant container (aerosol container), a fixed amount injection valve, and an injection button. An injection button, which is an operating unit for injecting the aerosol undiluted solution, is connected to the fixed-amount injection valve, and the injection button is provided with an injection port for ejecting the aerosol undiluted solution from the aerosol container to the outside (processing space). is there.

  When the injection button of the mosquito control aerosol is depressed once, the pressure of the propellant activates the quantitative injection valve, and the aerosol stock solution in the pressure-resistant container rises to the injection port and is injected into the processing space. At this time, the injection volume of the aerosol stock solution is adjusted to 0.1 to 0.4 mL, and more preferably to 0.2 to 0.4 mL. Within such a range, at least a part of the aerosol stock solution is formed as adhesive particles. If the injection volume is less than 0.1 mL, the injection volume is too small, so that the adherent particles do not sufficiently adhere to the exposed portion in the treatment space, and knock down or kill mosquitoes that have stopped at the exposed portion. Becomes difficult. In addition, since the amount of airborne particles is reduced, it is difficult to knock down or kill mosquitoes flying in the treatment space. On the other hand, if the volume exceeds 0.4 mL, the aerosol stock solution is unnecessarily released into the processing space, making it difficult for people and pets to enter the processing space. Also disadvantageous.

  The mosquito control aerosol is adjusted so that the spraying power is 0.3 to 10.0 g · f at 25 ° C. at a distance of 20 cm from the spray opening. Within such a range, the adhesive particles formed from the aerosol stock solution can reach the exposed portion in the treatment space smoothly by one injection, and the effect of the pest control component can be exhibited. . Further, it is preferable that the diameter of the injection port is set to 0.2 to 1.0 mm. Within this range, the above-mentioned particle diameter and spraying power can be appropriately adjusted, and at least a part of the aerosol stock solution sprayed into the processing space is optimally formed as adhesive particles, exhibiting a pest control effect. Mosquitoes in the treatment space can be reliably knocked down or killed.

FIG. 1 is a model diagram showing the behavior of particles of the aerosol stock solution when the aerosol stock solution is injected into the processing space. FIG. 1 (a) is a model diagram when a mosquito controlling aerosol according to a conventional product is sprayed into a processing space, and FIG. 1 (b) is a case where the mosquito controlling aerosol according to the present invention is sprayed into a processing space. It is a model figure in the case of having done.
As shown in FIG. 1 (a), the conventional aerosol product for controlling mosquitoes (hereinafter simply referred to as “conventional product”) becomes a particle M having a particle diameter of less than 20 μm when the aerosol stock solution is injected into the processing space. And diffuse into the processing space. Some time after the injection, the particles M are further diffused throughout the processing space and volatilize the pest controlling component. Thereby, mosquitoes flying in the processing space can be knocked down or killed. However, as described above, mosquitoes stay at the exposed part in the processing space longer than they fly, so conventional products have mosquitoes that stay at the exposed part in such processing space. Cannot be reliably knocked down or killed. In addition, when the wind blows in by opening a window in the processing space or the like, a part of the particles M floating in the processing space is washed away by the wind, and the effect of the pest control component is greatly reduced. Furthermore, if the time during which the particles M are floating in the processing space is long, the amount of particles M inhaled by a person or pet in the processing space increases, which may adversely affect the human body or the pet.
Therefore, the present inventors have developed an aerosol product for controlling mosquitoes that solves these problems after intensive research. Hereinafter, the adhesive particles and the floating particles, which are characteristic features of the mosquito control aerosol product according to the present invention, will be described.

[Adhesive particles]
As shown in FIG. 1B, when the aerosol stock solution is injected once into the processing space, the adherent particles X and the floating particles Y are formed. In FIG. 1 (b), those indicated by white circles are the adhesive particles X, and those indicated by black circles are the floating particles Y. The particle diameters of the two are different, and the adhesive particles X are formed to have a larger particle diameter than the floating particles Y. The preferred particle size of the adhesive particles X is such that the 90% particle size in the volume integrated distribution at 25 ° C. and the injection distance of 15 cm is 20 to 80 μm. Within this range, when the aerosol stock solution is injected into the processing space, it can quickly move to the exposed portion in the processing space and adhere to it. Therefore, mosquitoes remaining on the exposed portion can be knocked down or killed by the insect-controlling component of the adhesive particles X. In addition, since mosquitoes that enter the processing space and try to stop at the exposed part are also effective in controlling pests, they can be driven out of the processing space. When the particle diameter is less than 20 μm, it is difficult to reach the exposed part because the particle diameter is too small, and as a result, it is difficult to control mosquitoes that have stopped or are about to stop at the exposed part. Becomes On the other hand, when the particle diameter exceeds 80 μm, the behavior of the adhesive particles is difficult to control because the particle diameter is too large, and it is difficult to properly adhere to the exposed portion. A more preferred particle diameter of the adhesive particles X is a 90% particle diameter of 25 to 70 μm in a volume integrated distribution at 25 ° C. and a spray distance of 15 cm.

The preferable amount of the adherent particles X is 0.01 to 0.4 mg per 1 m ^{2 on} the exposed portion in the processing space, and preferably 0.05 to 0.2 mg per 1 m ² . Within such a range, mosquitoes remaining on the exposed portion can be effectively knocked down or killed. If the amount of adhesion is less than 0.01 mg per 1 m ² , a sufficient control effect on mosquitoes remaining on the exposed portion cannot be obtained, and it is difficult to knock down or kill mosquitoes. On the other hand, if the amount of adhesion exceeds 0.4 mg per 1 m ² , the pest control effect is not greatly improved, and the use amount of the aerosol stock solution is excessive, which is economically disadvantageous.

[Floating particles]
The preferred particle diameter of the buoyant particles Y is such that the 90% particle diameter in a volume integrated distribution at 25 ° C. and a jet distance of 15 cm is less than 20 μm. Within such a range, when the aerosol stock solution is jetted into the processing space, it can quickly diffuse and float in the processing space. Therefore, mosquitoes flying in the treatment space can be knocked down or killed by the pest controlling component of the airborne particles Y. In addition, since the present invention is also effective against mosquitoes trying to enter the processing space, it is possible to suppress the invasion into the processing space. When the particle diameter of the floating particles Y is 20 μm or more, the particles function as the adhesive particles X. As described above, by adjusting some of the particles in the aerosol stock solution as the floating particles Y and adjusting the particle diameter to the optimal range as described above, the particles behave differently from the adhesive particles X, Mosquitoes can be effectively knocked down or killed together with the sex particles X.

  As shown in FIG. 1B, the adhesive particles X and the floating particles Y are exposed to the exposed particles in the processing space immediately after the aerosol stock solution is injected once into the processing space. Buoyant particles Y begin to diffuse throughout the processing space. Some time after the first injection, the adhesive particles X have completely adhered to the exposed portion, and maintain the adhered state. Then, as described above, the mosquitoes remaining on the exposed portion are knocked down or killed by the pest control component. On the other hand, the buoyant particles Y spread uniformly throughout the entire treatment space, and the pest control components gradually evaporate, thereby knocking down or killing mosquitoes flying in the treatment space. Further, it is possible to prevent mosquitoes from entering the processing space. Even if the mosquitoes stop at the exposed portion of the processing space or approach the vicinity of the exposed portion even if the mosquitoes enter the processing space, the adhered particles X adhering to the exposed portion may be removed. The pest control component ensures knockdown or killing. As described above, the mosquito control aerosol according to the present invention has two types of particles having different behaviors, since the particles formed from the jetted aerosol stock solution, each of the particles is present in an optimal state. Can maximize the effect of controlling pests. For this reason, the adhesive particles X and the floating particles Y exert an excellent control effect on both mosquitoes existing in the treatment space and mosquitoes trying to enter the treatment space, and are knocked down or killed. Can be done.

  Further, when the wind blows into the processing space, even if a part of the floating particles Y is blown by the wind, the adherent particles X remain in the exposed portions. As described above, most of the mosquitoes in the treatment space stay in the exposed portion for a longer time, so that if the adhesive particles X can exert a desired effect, the amount of the floating particles Y decreases. However, there is no concern that the control effect on mosquitoes is inferior. Further, as in the conventional product, some of the particles formed by the aerosol stock solution injected into the processing space are formed as floating particles Y. For this reason, since the concentration of the aerosol stock solution (buoyant particles Y) diffused into the processing space is reduced by the amount of the adherent particles X, the concentration in the processing space is lower than that of the conventional product. Therefore, the influence on the human body and pets due to inhalation of the floating particles Y is reduced, and the product can be provided as a safe product.

When the aerosol stock solution prepared above is injected once into the treatment space, the duration of the effect of the pest control component is 20 hours or more in a space of 33 m ³ or less. The space of 33 m ³ or less includes a living room of 4.5 to 8 tatami mats (height of ceiling 2.5 m). Therefore, the mosquito control aerosol according to the present invention can maintain the pest control effect for almost a day in a normal living space such as a general house. Mosquitoes enter indoors day and night, and it is necessary to prevent them from being sucked in blood especially at bedtime. However, since the effect of the pest control component lasts for more than 20 hours in a space of 33 m ³ or less. For example, if the injection is performed once before going to bed at night, the effect is maintained until the afternoon of the next day, and the patient can go to bed with peace of mind.

<Mosquito control method>
The mosquito control method of this configuration is carried out using the mosquito control aerosol described above. First, in an aerosol stock solution containing a pest control component and an organic solvent, and in a pressure-resistant container provided with a fixed injection valve enclosing a propellant, an injection button provided with an injection port connected to the fixed injection valve. When pressed once, the aerosol stock solution is injected from the injection port into the processing space (injection step). At this time, as shown in FIG. 1B, the adhesive particles X and the buoyant particles Y are formed from the aerosol stock solution and injected into the processing space. The adherent particles X adhere to exposed portions in the processing space, and the floating particles Y float in the processing space. The adherent particles X are effective for knocking down or killing mosquitoes remaining on the surface of the wall surface, floor surface, structure, etc. in the processing space, or for mosquitoes trying to stop at these places. Play and drive out of processing space. On the other hand, the buoyant particles Y can knock down or kill mosquitoes flying in the treatment space, and also have an effect on mosquitoes trying to enter the treatment space, and enter the treatment space. Suppress intrusion. The pest control effect of the adhesive particles X and the floating particles Y as described above is maintained for a long time of 20 hours or more in a space of 33 m ³ or less. After a predetermined time has elapsed, the aerosol stock solution can be sprayed again into the processing space to knock down or kill mosquitoes.

As described above, the mosquito control aerosol according to the present invention has a duration of the component for controlling insect pests of 20 hours or more in a space of 33 m ³ or less, and is about 1 day. Therefore, in the case of the mosquito control method performed using the mosquito control aerosol, the operation can be completed only by executing the injection step of injecting once a day at a fixed time every day. In this way, anyone can easily inject the aerosol stock solution into the processing space, and it is possible to prevent missing the timing of the injection.

  For the mosquito controlling aerosol of the present invention, a plurality of mosquito controlling aerosols (Examples 1 to 10) having the characteristic constitution of the present invention were prepared to confirm the mosquito controlling effect, and the mosquito controlling effect was confirmed. The test was performed. For comparison, mosquito controlling aerosols (Comparative Examples 1 and 2) not provided with the features of the present invention were prepared, and a similar mosquito controlling effect confirmation test was performed.

As shown in Table 1 as Examples 1 to 10, mosquito control aerosols were prepared according to the composition and conditions according to each example, and the following tests were performed. For Comparative Examples 1 and 2, mosquito controlling aerosols were prepared under the compositions and conditions shown in Table 1, and the same tests as in Examples were performed. Table 2 shows the test results.
(1) 25 m the aerosol mosquitoes control injected once obliquely upward with respect to the central room 25 m ³ was completely closed control effect mosquitoes in ³ rooms, this immediately emit Fifty Culex females After exposure for 2 hours, all test mosquitoes were collected. During that time, female Culex pipiens mosquitoes that fell over time with time were counted, and the KT ₅₀ value was determined. In the same room, the same operation was performed 10 hours, 14 hours, and 20 hours after the mosquito control aerosol was injected once.
(2) Airborne Residual Rate of Floating Particles An aerosol for mosquito control was sprayed once diagonally upward toward the center of a closed 25 m ³ room. An air collecting tube (filled with silica gel in a glass tube and stuffed with cotton wool at both ends) is installed 50 cm behind the center of the room (130 cm from the wall surface) and 120 cm above the floor, and connected to a vacuum pump to perform injection processing. After a lapse of 2 hours, a predetermined amount of air was sucked. The air collection tube was washed with acetone, and the amount of the collected pest control components was analyzed by gas chromatography (model GC1700, manufactured by Shimadzu Corporation). Based on the obtained analysis values, the aerial concentration of the pest control component was calculated, and the ratio to the theoretical aerial concentration was determined as the aerial residual ratio.

From the results in Tables 1 and 2, when using metofluthrin and / or transfluthrin as the pest control components (Examples 1 to 7, 9, 10), the mosquito control aerosol was injected once. Even after 20 hours, the KT ₅₀ value was maintained at a significant value, indicating an excellent control effect. Even when a small amount of profluthrin was added to transfluthrin (Example 8), the control effect was excellent. As the organic solvent to be combined with the pest control component, higher fatty acid esters having a total of 16 to 20 carbon atoms such as isopropyl myristate, and lower alcohols having about 2 to 3 carbon atoms such as ethanol are effective. I understood that. On the other hand, in Comparative Examples 1 and 2, 10 hours after the mosquito control aerosol was injected once, the KT ₅₀ value was inferior to the Example, and after 14 hours, The results were even worse. After 20 hours, it was shown that the control effect on the adult female Culex pipiens was almost extinguished in all the comparative examples.

Next, with respect to mosquitoes different from those in Examples 1 to 10, a test was conducted to confirm the mosquito control effect of the mosquito control aerosol of the present invention. This test is referred to as Example 11.
In Example 11, a pest control component, metofluthrin, was dissolved in an organic solvent, isopropyl palmitate, to prepare an aerosol stock solution of 36.0% by weight of metofluthrin. 4.0 mL of this aerosol stock solution and 16.0 mL of liquefied petroleum gas as a propellant were pressurized and filled into an aerosol container equipped with a fixed quantity injection valve to obtain an aerosol for controlling mosquitoes of the present invention. The volume ratio (a / b) between the aerosol stock solution (a) and the propellant (b) was adjusted to be 20/80. Then, in a 6-tatami room (approximately 25 m ³ ) having a ceiling height of 2.5 m (approximately 25 m ³ ) in which the mosquito control aerosol was substantially sealed, 0.1 mL of the aerosol stock solution was sprayed slightly obliquely upward. At this time, the spraying power (25 ° C.) of the mosquito controlling aerosol at a spraying distance of 20 cm was 1.4 g · f. The 90% particle diameter of the adhesive particles formed by the aerosol stock solution in a volume integrated distribution at 25 ° C. and a spray distance of 15 cm was 42 μm.

  Immediately after the mosquito control aerosol of Example 11 was sprayed, midges were released into this room, and the midges immediately knocked down or died. Further, the aerial residual ratio of the pest control component (methfluthrin) was determined by the same method as in Examples 1 to 10, and was 0.93%.

From the test results of Examples 1 to 11, according to the mosquito control aerosol of the present invention and the mosquito control method using the same, it takes more than 20 hours for a space of at least 25 m ³ (corresponding to about 6 tatami mats). It has been clarified that the mosquito exhibits an excellent control effect for a long time. It was confirmed that the mosquito control aerosol of the present invention exhibited a mosquito control effect of 20 hours or more even when the space volume to be treated was expanded to 33 m ³ (equivalent to about 8 tatami mats). In addition, when the same control effect confirmation test was performed on flying pests other than mosquitoes, it showed a control effect of 4 hours or more against a space of 33 m ³ or less against flies, and was very practical. Turned out to be. Furthermore, a secondary effect of preventing creeping pests such as cockroaches, ants, and beetles was also confirmed.

  ADVANTAGE OF THE INVENTION According to this invention, the mosquito control aerosol which has a high control effect with respect to a mosquito, and the mosquito control method using this can be provided.

X Adhesive particles Y Floating particles

Claims (7)

An aerosol stock solution containing a pest control component and a higher fatty acid ester having a total number of carbon atoms of 16 to 20 as an organic solvent, and a pressure-resistant container provided with a metering injection valve enclosing a propellant,
An injection button provided with an injection port connected to the fixed-quantity injection valve,
A mosquito control aerosol provided with
The ejection capacity when the ejection button is pressed once is 0.1 to 0.4 mL, and the ejection force at an ejection distance of 20 cm is adjusted to be 0.3 to 10.0 g · f at 25 ° C.,
The aerosol undiluted solution is sprayed from the spray port as adhesive particles that adhere to an exposed portion where mosquitoes in the processing space stop at least partially,
The adhesive particles have a 90% particle diameter of 56 to 80 μm in a volume integrated distribution at 25 ° C. and a spray distance of 15 cm,
Adhesion amount of the adherent particles are 0.01~0.4mg per 1 m ² on the exposed portion of the processing space mosquitoes control aerosol.   The mosquito control according to claim 1, wherein a volume ratio (a / b) of the aerosol stock solution (a) and the propellant (b) enclosed in the pressure-resistant container is 10/90 to 50/50. aerosol. The mosquito controlling aerosol according to claim 1 or 2 , wherein the pest controlling component has a vapor pressure at 30 ° C of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg. If injected once the aerosol stock solution into the processing space, the effect duration of the pest control component is mosquitoes according to any one of claims 1 to 3 is at least 20 hours against 33m ³ following space Aerosols for controlling insects. The mosquito control aerosol according to any one of claims 1 to 4 , wherein the injection port has a nozzle diameter of 0.2 to 1.0 mm. A mosquito control method for injecting the aerosol stock solution into a treatment space using the mosquito control aerosol according to any one of claims 1 to 5 to knock down or kill mosquitoes. The mosquito control method according to claim 6 , wherein the injection of the aerosol stock solution into the processing space is performed once every 24 hours.

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