JP5517496B2 - Pest control method - Google Patents

Description

The present invention relates to a method for controlling pests.

Aerosol pesticides used indoors include a direct hit type that sprays on target pests such as pests flying in indoor spaces or pests that crawl walls and floors, and the path of pests in advance. There is an ambush type in which aerosol pesticide is sprayed on. In the latter case, since the residual effect is required, an insecticidal component having a low vapor pressure and low volatility is often used.

On the other hand, there is also an attempt to prevent the flying insects in a preventive manner by previously applying an aerosol insecticide containing an insecticide component having a relatively high vapor pressure in a sealed space to leave floating insecticide component particles in the air. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-17055) preferably uses a room-temperature volatile pyrethroid and uses a solvent having a high vapor pressure to reduce the particle size of the treatment agent, thereby increasing the amount of treatment agent. There is described an aerosol insecticide whose residual rate can be 1% or more between 3 hours and less than 12 hours from the start of treatment, or 0.5% or more between 12 hours and less than 24 hours from the start of treatment. Yes. According to Patent Document 1, the smaller the spray particle diameter, the higher the residual ratio of the treatment chemical in the air, and the insecticidal efficacy is maintained. Therefore, the aerosol insecticide that provides such a spray particle diameter is used for flying mosquitoes and the like. It can be said that it is effective for pest control. However, the technical idea of Patent Document 1 is to keep the residual amount of the treatment drug particles in the air for the purpose of controlling flying insects for a long time.

By the way, the treatment chemical particles sprayed in the air (A) remain floating in the air, (B) adhere to the floor or wall, (C) re-evaporate after B, or (D) light, etc. Follow one of the following behaviors: Since the aerosol insecticide of Patent Document 1 is intended to reduce the ratio of (B) of the treatment drug particles and increase the ratio of (A), the insecticidal effect is not exerted on the insect pests that wrinkle walls and floors. .
On the other hand, Patent Document 2 (Japanese Patent Application Laid-Open No. 2001-328913) directly attaches an aerosol containing an insecticidal component / metofluthrin to the surface of indoor structures and fixtures, and the flying pest is repelled from the surface by the action of metfurthrin. It is disclosed that it can be disinfected. This Patent Document 2 is a method of expecting (C) after (B), but since the transition to (C) is greatly influenced by the use conditions, a stable extermination effect against flying pests is obtained. I can't think of it.

In recent years, there has been a growing need for aerosol pesticides that can be used to control all pests, including flying pests and moth pests, and have a long-lasting insecticidal effect. As described above, direct hit types are commercially available for both flying pests and moth pests, but aerosol pesticides effective against both pests have not yet been developed for the purpose of prevention.

JP 2001-17055 A JP 2001-328913 A

An object of the present invention is to provide a pest control aerosol containing a room temperature volatile pyrethroid compound by spraying a certain amount indoors, and the treatment space has an atmosphere that can control both flying pests and moth pests over a long period of time. It is to provide a control method.

The present invention has been found that the following constitution has an excellent effect for achieving the above-mentioned object.
(1) One or more selected from metfurthrin, profluthrin and transfluthrin which are pyrethroid compounds having a vapor pressure at 30 ° C. of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg as a pest control component, and It consists of an aerosol stock solution containing a lower alcohol having 2 to 3 carbon atoms as a solvent and a propellant, and has an aerosol stock solution / propellant ratio of 20-50 / 50-80 (volume ratio) and an injection force at an injection distance of 20 cm. A certain amount of aerosol for pest control equipped with an aerosol valve for quantitative spraying of 3.0 g · f or more is sprayed indoors, and in the particle size distribution of the spray particles of the aerosol for pest control, 10 to 50 μm spray particles are present. Account for more than 60% of the total and 20% or more of the total spray particles settle to the floor by 1 hour after spraying, Alternatively, a method for controlling pests that attaches to a wall surface and makes the treatment space have an atmosphere in which both flying pests and moth pests can be controlled for 5 to 12 hours.
( 2 ) The pest control method according to (1) , wherein a spray volume per one time of the aerosol valve for quantitative spraying is 0.35 to 0.9 mL.

According to the pest control method of the present invention, a specific pest control aerosol containing a room temperature volatile pyrethroid compound is sprayed in a certain amount indoors to control both flying pests and moth pests over a long period of time. Since it can be made possible atmosphere, it is extremely practical.

In this invention, 1 type, or 2 or more types chosen from the pyrethroid compound whose vapor pressure in 30 degreeC is ² * 10 ^{< -4} > ^-1 * 10 ^<-2 > mmHg is used as a pest control component. Such a compound has a room temperature volatility, and examples thereof include metofluthrin, profluthrin, transfluthrin, empentrin, teraleslin, and flamethrin. In particular, in view of vapor pressure, stability, basic insecticidal efficacy, etc., metfurthrin, profluthrin and transfluthrin are preferred. In addition, in the acid component and alcohol part of a pyrethroid compound, when the optical isomer and geometrical isomer based on asymmetric carbon exist, it is needless to say that each and arbitrary mixtures are also included by this invention.
Using a pest control component with a vapor pressure at 30 ° C. exceeding 1 × 10 ⁻² mmHg, the volatility is too high, while if it is less than 2 × 10 ⁻⁴ mmHg, even if all other requirements are met, Since the spray particles of the pest control component cannot remain in the air for a long time, it is inappropriate.

The pest control method of the present invention sprays a small amount of a pest control aerosol having a high concentration of the pest control component, so that the content of the pest control component in the aerosol stock solution is as high as about 1.0 to 30 w / v%. It becomes. The solvent used in the preparation is specified as a lower alcohol having 2 to 3 carbon atoms in consideration of the vapor pressure of the pest control component, and ethanol or isopropanol (IPA) is generally used. Such lower alcohols are quick-drying and volatilize quickly after spraying, so that the spray particles become fine and the pest control component tends to remain floating in the space.
In addition, when the content of the pest control component in the aerosol solution is less than 1.0 w / v%, the desired effect cannot be obtained. On the other hand, when the content exceeds 30 w / v%, the aerosol content solution is stabilized in terms of liquidity. With difficulty.

In the pest control method of the present invention, a pest control aerosol containing a room temperature volatile pyrethroid compound is sprayed indoors at a constant amount, preferably 0.35 to 0.9 mL toward the air at a time, and a predetermined amount of spray particles This is characterized in that a sufficient amount of spray particles adhere to the floor and walls so that the treatment space has an atmosphere that can control both flying insects and insect pests over a long period of time. Have.
For this reason, the pest control aerosol used in the present invention has an aerosol stock solution / propellant ratio of 20-50 / 50-80 (volume ratio) and an injection force of 3.0 g · f or more at an injection distance of 20 cm. It is essential.
If the aerosol stock solution / propellant ratio is smaller than 20/80 and there are too many propellants, the spray particles become finer than necessary and the amount of adhesion to the floor or wall becomes insufficient. On the other hand, when the ratio exceeds 50/50, the spray particles are quickly settled, and the air concentration of the pest control component becomes insufficient.
As for the spraying power, if it is less than 3.0 g · f, the momentum of spraying is insufficient, and the spray particles do not reach the indoor corner, so that a satisfactory pest control effect cannot be obtained.

In the present invention, phthalthrin, resmethrin, cyfluthrin, phenothrin, permethrin, ciphenothrin, cypermethrin, allethrin, praretrin, flamethrin, imiprotorin, etofenprox, in addition to the above-mentioned room temperature volatile pyrethroid compound, without departing from the spirit of the invention A slight amount of a pyrethroid compound such as silafluorene, an organic phosphorus compound such as dichlorvos or fenitrothion, or a carbamate compound such as propoxur may be added.
In addition to lower alcohols having 2 to 3 carbon atoms, for example, hydrocarbon solvents such as n-paraffins and isoparaffins, glycol ethers having 3 to 6 carbon atoms, ketone solvents, ester solvents, etc. Can be added as appropriate.

Since the pest control aerosol used in the present invention is sufficiently sprayed in a small amount, it is not necessary to pay attention to the danger to fire, but an aqueous formulation can also be adopted from the viewpoint of reducing it as much as possible. In this case, the amount of water is appropriately about 20 to 70 v / v%, and a small amount of nonionic surfactant is added as a solubilizing aid as long as the spray pattern of spray particles is not hindered. May be.
Examples of the nonionic surfactant include ethers such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene alkylamino ethers, polyethylene glycol Examples include fatty acid esters, polyoxyethylene sorbitan fatty acid esters, fatty acid esters such as polyoxyethylene glycerin fatty acid esters, polyoxyethylene styrenated phenol, and fatty acid polyalkalol amide, among which ethers are suitable. ing.

In the present invention, in addition to the above-described components, antifungal agents for fungicides, fungi, fungi, antibacterial agents and fungicides, or fragrances, deodorants, stabilizers, antistatic agents, Of course, an antifoaming agent, an excipient and the like may be appropriately blended. Examples of acaricides include methyl 5-chloro-2-trifluoromethanesulfonamide benzoate, phenyl salicylate, 3-iodo-2-propynyl butyl carbamate, and the like. Hinokitiol, 2-mercaptobenzothiazole, 2- (4-thiazolyl) benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, triphorin, 3-methyl-4-isopropylphenol, ortho-phenylphenol, etc. Can be illustrated.
As the fragrance, orange oil, lemon oil, lavender oil, peppermint oil, eucalyptus oil, citronella oil, lime oil, yuzu oil, jasmine oil, coconut oil, green tea essential oil, limonene, α-pinene, linalool, geraniol, Examples include, but are not limited to, aromatic components such as phenylethyl alcohol, amylcinnamic aldehyde, cuminaldehyde, and benzyl acetate, green leaf alcohol called “green scent”, and flavor components containing green leaf aldehyde.

Examples of the propellant used in the present invention include liquefied petroleum gas (LPG), dimethyl ether (DME), and compressed gases such as nitrogen gas, carbon dioxide, nitrous oxide, and compressed air, one or more of them. Can be used as appropriate, but those mainly composed of LPG are easy to use.
In the present invention, the aerosol stock solution / propellant ratio is set to 20 to 50/50 to 80 (volume ratio) in consideration of the residual ratio of spray particles in the air and the adhesion rate to the floor or wall. In addition, in the particle size distribution of the spray particles, whether spray particles of 10 to 50 μm occupy 60% or more of the total, and 20% or more of the total spray particles settle on the floor by 1 hour after the spray treatment. Or it is preferable to design so that it may adhere to a wall surface.

The above-mentioned pest control aerosol is equipped with a fixed-amount aerosol valve for spraying a certain amount indoors, and an appropriate spray volume per time is 0.35 to 0.9 mL. If the injection force at an injection distance of 20 cm is 3.0 g · f or more, the shape of the nozzle, nozzle, container, etc. may be selected as appropriate according to its use, purpose of use, and the like.
For example, it can be designed as a desktop type equipped with a button to be sprayed from above and an obliquely upward nozzle, or designed for carrying a small container.

In the present invention, the pest control aerosol thus obtained is sprayed indoors at a constant amount, preferably 0.35 to 0.9 mL toward the air at a time, and a predetermined amount of spray particles remain floating in the air. On the other hand, a sufficient amount of spray particles are allowed to adhere to the floor or wall, and the treatment space has an atmosphere that can control both flying insects and insects over a long period of time.
At this time, the inventors have found that the spray force at a spray distance of 20 cm is an extremely important factor along with the spray particle diameter, and have completed the present invention.
That is, the aerosol insecticide of Patent Document 1 aims at controlling only flying insect pests such as mosquitoes, and it is sufficient to reduce the spray particle size in order to increase the residual rate of treatment chemicals in the air, taking into consideration the injection force. Although it was not necessary, in the pest control method of the present invention, the range of the spray force had to be specified from the necessity of relatively increasing the spray particle diameter.
In the present invention, the amount of the pest control component sprayed in the air is suitably about 2 to 50 mg / m ³ , and both the flying pest and the moth pest over the treatment space for about 5 to 12 hours in one application. The atmosphere can be controlled.

The pests that are effective for the pest control method of the present invention include pests that fly indoors and cause damage and discomfort to humans, for example, mosquitoes such as mosquitoes, Aedes albopictus, chironomids, house flies, butterflies, flyfish, fly species In addition to various flying pests such as bees, leafhoppers, cockroaches such as German cockroaches, American cockroaches, black cockroaches, ants, ant beetles, bark beetles, hornet beetles, bark beetles, barbet beetles, and common bugs, these pests It is not limited to.

Next, the pest control method of the present invention will be described in more detail based on specific examples and test examples, but the present invention is not limited to these.

Methofluthrin 4.0 w / v% was dissolved in ethanol to prepare an aerosol stock solution. The aerosol stock solution 12 mL and the liquefied petroleum gas 18 mL [aerosol stock solution / propellant ratio: 40/60 (volume ratio)] are pressurized and filled into an aerosol container with an aerosol valve for quantitative spraying, and the pest control aerosol used in the present invention is obtained. Obtained.
The spraying force of this aerosol at a spraying distance of 20 cm was 6.5 g · f, and spray particles of 10 to 50 μm accounted for 80% of the total.

In an almost sealed 6 tatami room, 0.6 mL of the aerosol was sprayed slightly diagonally upward. As for this aerosol, 30% of the whole spray particles settle on the floor surface by 1 hour after the spraying treatment, or adhere to the wall surface, and of course control flying insects such as mosquitoes over 7 hours. It was very practical because it did not attract insect pests such as cockroaches, ants, and beetles.

According to Example 1, various pest control aerosols shown in Table 1 were prepared and subjected to the following tests. The test results are summarized in Table 2.
(1) was 0.6mL sprayed test aerosol in the center obliquely upward room 25 m ³ was completely closed control effect against flying insect pests in the room 25 m ^3. Immediately, 50 female mosquitoes were released and exposed for 2 hours, and then all test mosquitoes were collected. In the meantime, female Culex mosquitoes that fell and turned over time were counted, and the KT ₅₀ value was determined. In the same room, the same operation was performed 4 hours after spraying and 7 hours after spraying.
(2) Repellent effect against moth pests Six 20 × 20 cm glass plates (two for German cockroaches, two for black ants, and one for red ants) were installed in the center of a 25 m ³ room where they were completely closed. 0.6 mL of the test aerosol was sprayed obliquely upward from the center of the room, and 3 glass plates were collected after 2 hours. One drug-adhered glass plate and one untreated glass plate were aligned with no gap between them and placed so that the center of the plastic ring having a diameter of 15 cm was at the joint. The German cockroaches (5 each), black ants (5) or red ants (5) were released freely in the ring, and after 30 minutes, which glass plate the test insects remained on was counted. The same operation was performed for the remaining three glass plates collected after 7 hours of spraying. The results are shown in the following criteria.
A: All knockdown or lethality, or all test insects are untreated glass plates, ○: 80-90% of the test insects are untreated glass plates (with repellent activity), Δ: 50-70 of the test insects % Is untreated glass plate (possibility of repellent activity), x: no repellent activity.
(3) the floor of the room floor and wall deposit quantity 25 m ³ of the spray particles and the number of walls Kesho Place glass plate 20 × 20 cm, remove all of the glass plate sprayed 1 hour after, deposited pest control The components were washed out with acetone and analyzed by gas chromatography. Based on the obtained analysis values, the ratio of the pest control component that settled on the floor surface by 1 hour after the spraying treatment or adhered to the wall surface to the theoretical total amount of spraying was determined.

As a result of the test, a pyrethroid compound having a vapor pressure of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg at 30 ° C. as a pest control component, preferably one or two selected from metfurthrin, profluthrin and transfluthrin As described above, and consisting of an aerosol stock solution and a propellant containing a lower alcohol having 2 to 3 carbon atoms as a solvent, the aerosol stock solution / propellant ratio is 20-50 / 50-80 (volume ratio), and at a jetting distance of 20 cm. A pest control aerosol equipped with an aerosol valve for quantitative spraying that has a spraying power of 3.0 g · f or more is 7 hours or more for both flying pests and moth pests by spraying a certain amount indoors. Excellent pest control effect was maintained.
On the other hand, when the d, d-T80-praretrin having a vapor pressure of less than 2 × 10 ⁻⁴ mmHg is used as a pest control component as in Comparative Example 1, the spray particles of the pest control component are long in the air. Although it did not remain and settled on the floor surface in a short time, the pest control effect against flying pests was quickly reduced, although the pest control effect was exerted against moth pests. Such a tendency is found in Comparative 3 in which the ratio of aerosol stock solution / propellant is greater than 50/50, and in Comparative 5 in which kerosene is used as a solvent instead of 2-3 lower alcohols, even if a predetermined pest control component is used. Was also recognized.
On the other hand, if the aerosol stock solution / propellant ratio is less than 20/80 as in Comparison 2, the spray particles become too fine, and if the injection force is less than 3.0 g · f as in Comparison 4, The ratio of the spray particles adhering to the floor surface and the wall surface was lowered, and all of them caused a decrease in the pest control effect against the pest pests.
Thus, it became clear that only the pest control method of the present invention can provide an excellent pest control effect for 7 hours or more against both flying pests and moth pests.

The pest control method of the present invention can be used not only indoors but also for a wide range of pest control.

Claims (2)

One or more selected from pyrethroid compounds, metfurthrin, profluthrin and transfluthrin, whose vapor pressure at 30 ° C. is 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg as a pest control component , and carbon as a solvent It consists of an aerosol stock solution containing a lower alcohol having a number of 2 to 3 and a propellant, and has an aerosol stock solution / propellant ratio of 20-50 / 50-80 (volume ratio) and an injection force of 3.0 g at an injection distance of 20 cm. -A pest control aerosol provided with an aerosol valve for quantitative spraying that is greater than or equal to f is sprayed in a certain amount indoors, and in the particle size distribution of the spray particles of the pest control aerosol, 10 to 50 µm spray particles as a whole Or more than 20% of the total spray particles settle on the floor by 1 hour after the spray treatment, or Is a method for controlling pests, characterized in that the treatment space is made to have an atmosphere in which both flying pests and insect pests can be controlled over 5 to 12 hours. The spray volume per single metered dose aerosol valve, pest control method according to claim 1, characterized in that the 0.35～0.9ML.