JP2011012056A - Method for controlling insect pest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that an original method for controlling insect pests by which insecticidal effects can be sustained over a long period of time even when a smoking or a heating time is shortened and is desired for a mosquito-repellent incense stick or a heating vaporizing formulation, wherein continuous use over the long period of time has hitherto been considered as a basis.SOLUTION: The method for controlling the insect pests includes: smoking or heating and vaporizing a treating chemical containing one or two or more compounds selected from among pyrethroid compounds having vapor pressure of 2×10to 1×10mmHg at 30°C as insecticidal components within 1 h; changing the particle diameter of the treating chemical containing the insecticidal component vaporizing into air to ≤1 μm; and providing an atmosphere which allows control of the insect pests for ≥5 h. The usefulness is particularly high in the form of the mosquito-repellent incense stick sustaining the insecticidal effects by actions of smoke.

Description

The present invention relates to a pest control method, and more specifically to a pest control method using a pyrethroid compound having a vapor pressure of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg at 30 ° C. by smoke or heat transpiration. It is.

Conventionally, as a method of combating flying insects such as mosquitoes and blood-sucking insects, for example, mosquito coils that are smoked, mosquito-repellent mats to be evaporated and liquid electric mosquito traps, or liquids containing insecticidal components in the air Sprays for spraying, aerosols using propellant gas, etc. are widely used. The former mosquito coils and heat transpiration products are characterized by maintaining a certain insecticidal effect for more than 7 hours during bedtime, while the latter sprays and aerosols have a direct insecticidal effect while being transient. It has the merit that it can be disinfected.
By the way, in recent years, due to the improvement of the sanitary environment and changes in housing conditions, especially in urban condominiums, etc., housing has been sealed, and there is an opportunity for insects such as mosquitoes to enter the building from outside the building. decreasing. For this reason, if the mosquitoes etc. in the room are exterminated before going to bed, it is not always necessary to transcribe the insecticidal components continuously throughout the bedtime like conventional mosquito coils and heat transpiration products.

Under such circumstances, attempts have been proposed to maintain the insecticidal effect by suppressing the decrease in the concentration of the insecticidal components in the air after spraying for sprays and aerosols that have a transient insecticidal effect.
For example, in Patent Document 1 (Japanese Patent Laid-Open No. 2001-17055), the particle size of the treatment agent is mainly used in an aerosol spray method or a piezo spray method, preferably using a room temperature volatile pyrethroid and using a solvent having a high vapor pressure. And the residual rate in the air of the treatment chemical amount is 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 It is described that it can be.
With such a method, it can be evaluated that a part of the treatment chemical amount remains in the air to some extent even after 12 hours and shows a certain insecticidal effect, but there is no room for improvement.

Therefore, the present inventors have fundamentally reviewed the concept of mosquito coils and heat transpiration preparations, which have been considered to be the long-term continuous use so far. We worked on the development of a unique pest control method that could last for a long time. In the case of a mosquito coil and a heat transpiration product, the insecticidal component is transpirated by thermal energy, and the behavior in the air is greatly different from that of sprays and aerosols. Therefore, there is a possibility that Patent Document 1 regarding sustaining the insecticidal effect is not helpful.
As a result of intensive studies on the relationship between the concentration of insecticide components in the air and the persistence of the insecticidal effect for the mosquito coils and heat transpiration preparations, the present inventors have found that the present invention is capable of producing smoke or smoke. It has been found that it is useful for achieving the effect that the insecticidal effect can be maintained for a long time even if the heating time is shortened.

In addition, in recent years, for those who dislike use in highly sealed rooms or smoke of mosquito coils, the amount of smoke of conventional mosquito coils has been reduced as shown in Patent Document 2 (Japanese Patent Application Laid-Open No. 2008-13547). Smoke or smokeless incense tends to be preferred.
However, as a result of further tests, the present inventors have found that the smoke of a mosquito coil is an incense that uses a room temperature volatile pyrethroid as an insecticidal component, not only as a carrier of the insecticidal component, but also to maintain the insecticidal effect. It has been found that it contributes to no small amount, and has completed a useful pest control method in the form of an incense stick, regardless of whether it is a regular type or a fine smoke type.

JP 2001-17055 A JP 2008-13547 A

  The present invention is a unique insect pest control that can maintain the insecticidal effect for a long time even if the smoke or heating time is shortened for mosquito coils and heat transpiration products that have been considered to be the basic use for a long time until now. It aims to provide a method.

The present invention has been found that the following constitution has an excellent effect for achieving the above-mentioned object.
(1) Treatment chemical containing one or more compounds selected from pyrethroid compounds having a vapor pressure of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg at 30 ° C. as an insecticidal component within 1 hour A pest control method in which the particle diameter of a treatment chemical containing an insecticidal component that is smoked or evaporated by heating is 1 μm or less, and the atmosphere can be controlled for 5 hours or more.
(2) The treatment chemical is an insecticidal component of 0.5 to 5.0% by weight, a binder, an incense base material, and a di-tert-butyl-phenol stabilizer having a boiling point of 250 ° C. or higher. Or the pest control method as described in (1) containing 2 or more types.
(3) The pest control method according to (1) or (2), wherein the pyrethroid compound is one or two or more compounds selected from metfurthrin, profluthrin, and transfluthrin.

  The pest control method of the present invention is extremely practical because it maintains the insecticidal effect for a long time even if the smoke or heating time is shortened while following the merits of conventional mosquito coils and heat transpiration preparations. In addition, in the form of incense, the insecticidal effect can be stably maintained over a long period of time by the action of some smoke, while the smoke emission is limited to only a short time during soot and the total smoke volume is the conventional product. Since it is significantly reduced compared to, it is easy to use for those who hate smoke.

In the present invention, one or more selected from pyrethroid compounds having a vapor pressure at 30 ° C. of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg are used as the insecticidal component. Such a compound has a volatile property at room temperature, and examples thereof include metofluthrin, profluthrin, empentrin, transfluthrin, teraleslin, flamethrin and the like. In particular, in consideration of vapor pressure, stability, basic insecticidal efficacy, etc., metfurthrin, profluthrin, and transfluthrin are preferable.
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.
In addition, as long as the object of the present invention is not hindered, a conventional general-purpose pyrethroid compound having a vapor pressure lower than that of the insecticidal component, for example, allethrin, praretrin, pyrethrin or the like may be blended.

In the present invention, smoking or heating time such as mosquito coils, mosquito mats, and liquid electric mosquito traps, which have been considered to be a continuous use for a long time, is within 1 hour, preferably 15 to The present invention provides a pest control method that makes the treatment space an atmosphere capable of controlling pests over 5 hours or more, preferably 7 to 15 hours, even if shortened to 30 minutes.
Therefore, the mosquito coils and heat transpiration preparations used in the present invention must evaporate a relatively high concentration of insecticidal ingredients in a short time, and the content of the insecticidal ingredients per preparation is higher than that of conventional preparations. . Of course, the content of the insecticidal component per preparation may be appropriately determined depending on the type of insecticidal component used, the set smoke or heating time, etc. For example, for 7 hours containing methfluthrin, profluthrin, transfluthrin In the case of a mosquito coil, if the smoke time is 15 to 30 minutes, the content of the insecticidal component in the incense is 0.5 to 5.0 with respect to 0.0075 to 0.3% by mass of the conventional type. About mass% is appropriate.
On the other hand, in the case of a mosquito mat for one day, about 5 to 100 mg / mat is compared with 2.0 to 15 mg / mat of a conventional type, and in the case of a liquid electric mosquito collector for 60 days, 0.3 to 1. About 1.0 to 20% by mass is suitable for 2% by volume.
In the present invention, as a mosquito repellent, a mosquito repellent mat, and a liquid electric mosquito repellent for convenience, it is referred to as a mosquito repellent preparation, but it goes without saying that it is also applicable to pests other than mosquitoes.

In the present invention, other volatile chemicals may be added together with the insecticidal component. Such volatile agents include repellent components such as diet, dimethyl phthalate, p-menthane-3,8-diol, antibacterial components such as hinokitiol, tetrahydrolinalol, eugenol, citronellal, allyl isothiocyanate, isopropylmethylphenol, ortho Antifungal ingredients such as phenylphenol, orange oil, lemon oil, lavender oil, peppermint oil, eucalyptus oil, citronella oil, lime oil, yuzu oil, jasmine oil, camellia oil, green tea essential oil, limonene, α-pinene, linalool, geraniol Aromatic components such as phenylethyl alcohol, amylcinnamic aldehyde, cuminaldehyde, and benzyl acetate, green leaf alcohol called “green fragrance”, and flavoring components containing green leaf aldehyde, but are not limited thereto.
In recent years, so-called aromatherapy has been popular in which aroma components are drifted in the room to relieve the mood and promote recovery from fatigue. However, it can effectively cooperate with the pest control method of the present invention. Specifically, by applying to the present invention a treatment agent to which orange oil, lemon oil, lavender oil, peppermint oil, eucalyptus oil, etc. are added together with the insecticidal component, an excellent pest control effect and aromatherapy effect can be obtained simultaneously. It can be enjoyed for a long time. For example, if it is applied before going to bed, it can be rested without being bitten by mosquitoes and in a relaxed mood, which is extremely practical.

Hereinafter, the mosquito coils and heat transpiration preparations used in the present invention will be described.
Mosquito coils are used for the above-mentioned insecticidal components and volatile drugs, and if necessary, piperonyl butoxide or N- (2-ethylhexyl) -bicyclo [2,2,1] -hept-5-ene-2,3- It is produced by adding an efficacy enhancer such as dicarboximide, and further mixing a binder and an incense base material.
Examples of the binder include tab powder, starch, methylcellulose, carboxymethylcellulose, and the like, while the base material for incense is vegetable powder such as wood powder, pesticide chrysanthemum extract powder, citrus skin powder, and coconut shell powder. Examples thereof include carbon powder such as charcoal powder and elementary ash.

Note that the incense may contain a dye, an antiseptic, a stabilizer, a surfactant, a dispersant, a solvent, and the like, if necessary. Examples of the pigment include organic dyes such as malachite green, and typical examples of the preservative include acids such as sorbic acid, dehydroacetic acid, p-hydroxybenzoic acid, and salts thereof.
Examples of the stabilizer include an antioxidant and polyethylene glycol as a stabilizer for the carbon powder. In particular, it is preferable to add a di-tert-butyl-phenol stabilizer having a boiling point of 250 ° C. or higher. This stabilizer includes 2,6-di-tert-butyl-4-methylphenol (BHT), 2,2′-methylene bis (4-methyl-6-tertiary butyl phenol), 2,2′-methylene bis (4 -Ethyl-6-tertiarybutylphenol), 4,4'-butylidenebis (3-methyl-6-tertiarybutylphenol), 4,4'-thiobis (3-methyl-6-tertiarybutylphenol), 2-tertiary Butyl-6- (3-tertiarybutyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate, 2,4-ditertiarybutylphenyl 3,5-ditertiarybutyl-4-hydroxy Examples include benzoate. By adding such a stabilizer, not only the stability over time of the pyrethroid compound during storage, but also the stability during smoking is significantly enhanced, and further, the efficacy of the active ingredient after volatilization is improved. Can also contribute. As addition amount of a stabilizer, it is preferable to mix | blend 0.01-0.5 times amount with respect to a pyrethroid compound.

Surfactants and dispersants are used as appropriate in the preparation of dispersions containing insecticidal components and the like. Examples of such surfactants include polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene polyoxy Ethers such as propylene alkyl ethers and polyoxyethylene alkylamino ethers, polyethylene glycol fatty acid esters, polyoxyethylene sorbitan fatty acid esters, fatty acid esters such as polyoxyethylene glycerin fatty acid esters, polyoxyethylene styrenated phenols And polyalkalolamides of fatty acids.
In addition, a saturated hydrocarbon solvent having a boiling point of 150 to 350 ° C. is usually preferable as the solvent used for preparing the dispersion.

In preparing the mosquito coil, no special technique is required and a known production method can be employed. For example, water is added to a mixture of premix powder (a mixture of insecticidal ingredients, efficacy enhancers, etc. in a part of the incense base material) and the remaining incense base material and binder, and kneaded, Subsequently, after molding by an extruder or a punching machine, the mosquito coil may be made by drying. Further, after molding using only the binder and the incense base material, a liquid agent containing an insecticidal component or the like may be sprayed or applied thereto. The shape of the mosquito coil can be appropriately selected according to the purpose of use, such as a rod shape, a spiral shape, a cone shape, or a plate shape.
In addition, since the insecticidal component content in the mosquito coils is higher than that of the conventional type, the selection of binder and incense stick base material is selected so as not to reduce the volatilization rate of the insecticidal component during smoke. It is necessary to adjust the mixing ratio, the cross-sectional area of mosquito coils and the burning rate.

The mosquito coil used in the present invention uses a pyrethroid compound having room temperature volatility as an insecticidal component, and the particle size of the drug released into the air is 1 μm or less, so that the concentration of the insecticidal component in the treatment space is in the air It is possible to make the treatment space an atmosphere that can control pests for a long time. That is, this effect is presumed to be achieved by combining the following two actions.
(A) Since the particle diameter of the medicine accompanied by smoke is as fine as 0.001 to 0.1 μm, it can float for a long time in the space.
(B) Since the insecticidal component is room temperature volatile, what has adhered to the floor or wall is volatilized again.

  According to Patent Document 1, it is described that the probability of staying in the air is higher as the particle size of the treatment chemical is smaller. As will be described later, in the case of a heat transpiration preparation, the particle size of the transpiration agent is extremely small (according to the literature, the particle size of the drug vapor is 0.001 μm or less). Under the pest control method of the present invention, Incense sticks were expected to be more disadvantageous than heat-evaporated preparations in terms of the residual rate of insecticides in the air and the sustainability of insecticidal effects. However, the actual test results are not so, and the mosquito coil has maintained a high insecticidal effect for over 7 hours, suggesting that factors other than the particle size of the treatment agent are involved.

By the way, the conventional mosquito coils have a vapor pressure at 30 ° C. that is out of the range of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg, and a relatively low concentration of insecticidal components such as allethrin and praretrin at a low concentration. Contain and smoke for 7 hours or longer. In such conventional mosquito coils, it is known that the smoke of mosquito coils is acting as a carrier for insecticidal components and increases the diffusing power. When smoke was smoked and the subsequent behavior was examined, the insecticidal effect quickly decreased.
From this, the present inventors concluded that the smoke of the incense stick can effectively maintain the insecticidal effect only in the case of the mosquito coils with the room temperature volatile pyrethroid as the insecticidal component. The persistence of the insecticidal effect was examined by changing the amount. As a result, we confirmed that smoke, whether regular type or fine smoke type, contributes to sustaining the insecticidal effect with some action and completed a useful pest control method in the form of incense. It was. Thus, in the room temperature volatile pyrethroid incense, the knowledge that smoke is effective not only as a carrier of insecticidal components but also in sustaining the insecticidal effect is a completely new technical idea and is extremely practical.

About the amount of smoke at the time of soot, it tested as follows.
[Measurement method of smoke volume during smoke]
Smoke is smoked for 3 minutes in a transparent cylinder (diameter: 19cm, height: 43cm), diffuses smoke for 2 minutes, and then passes through the cylinder by a sensor (OMRON smart sensor, ZX-LT010 transmission type sensor head). The received light level was detected. The difference between the blank display value with nothing in the cylinder and the display value at the end of the measurement using the incense stick was determined as the smoke quantity index. In addition, the smoke quantity index of the conventional regular incense stick is about 1000, and the smoke quantity index of the fine smoke incense stick and the smokeless incense stick becomes almost proportionally smaller.

Typical examples of the heat transpiration preparation described below include a mosquito collecting mat and a liquid electric mosquito collecting.
The mosquito-repellent mat is a mixture of pesticide ingredients such as a hydrocarbon solvent such as kerosene, and if necessary, stabilizers such as BHT and methyl parahydroxybenzoate, colorants, aroma ingredients, and deodorant ingredients. After the preparation, it is made by impregnating a cellulose mat such as pulp or linter. And when a mosquito-removing mat is mounted on a heating plate and heated at 100 to 180 ° C., the insecticidal component becomes vapor and transpires into the air.
In the case of conventional mosquito mats for one day (8 to 12 hours), butyl stearate, piperonyl butoxide and N- (2-ethylhexyl) -bicyclo [2,2,1] -hept-5-ene-2 If a volatilizing sustained release agent such as 1,3-dicarboximide is not blended, an excessive insecticidal component volatilizes in the initial stage, and the insecticidal effect is significantly reduced from the middle stage to the later stage of use. Since the mat is heated for a short time, such a volatilization sustained release agent is not required.

On the other hand, liquid electric mosquito traps are also prepared in the same manner as mosquito trap mats. At this time, not a hydrocarbon solvent such as kerosene but water, a lower alcohol such as ethanol and isopropanol, an ester or ether solvent, a surfactant, a dispersant and the like are appropriately used to form an aqueous stock solution. The stock solution thus prepared is applied to a system in which a chemical bottle equipped with a liquid absorption wick is filled and then heated and evaporated at 60 to 140 ° C. through the liquid absorption wick.
The material of the liquid absorption core is one that is stable against insecticidal components and that absorbs the stock solution by capillary action. Specifically, it is formed by molding inorganic materials such as clay, talc, perlite, diatomaceous earth, etc. And a plastic core made of a porous ceramic core, a polyester fiber and / or a polyamide fiber. Of these, polyester fibers and / or polyamide fibers are suitable because they have little influence on the insecticidal component. However, since the concentration of the insecticidal component in the stock solution is higher than the conventional one, it is better to select a somewhat porous one so as not to cause clogging in the liquid absorbent core.
In addition, a dye, an antiseptic, 4,4′-methylenebis (2-methyl-6-tert-butylphenol), stearyl-β- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate in the liquid absorption core You may add antioxidants, such as these, suitably.
There are various types of liquid electric mosquito catchers for various use periods, such as for 30 days, 60 days, and 90 days, but the 60-day type is most widely used.

Regardless of whether you use a mosquito catching mat or a liquid electric mosquito catching agent, the prescribed chemicals are loaded into the electric mosquito catching device to evaporate the insecticidal components. It must be possible to control strictly. Moreover, it is convenient if a switch-off function corresponding to the heating time is provided. Further, an intermittent function, that is, the heating time is set to 1 hour or less, preferably 15 to 30 minutes, and a predetermined pause time is appropriately set. However, a function of alternately operating these may be provided.
In such a heat-evaporated preparation, the particle diameter of the treatment agent evaporating in the air is usually extremely fine, and as a pesticide component, a pyrethroid compound having a vapor pressure at 30 ° C. of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg, preferably By selecting metofluthrin, profluthrin, or transfluthrin, the insecticidal effect can be sufficiently sustained as in the case of mosquito coils.

  The pest control method of the present invention configured as described above is useful in indoors and outdoors, preferably in the room at bedtime, at the entrance and living room when going out, and various pests such as Acaeca, Kogataakaeka , Mosquitoes such as Aedes aegypti, Chikaeka, aedes such as Aedes aegypti, Aedes albopictus, chironomids, houseflies, fly flies, flies, flyfish, flyfish, nukaka, squid, etc. It is highly practical for controlling insects such as cockroaches such as black wagtails, ticks, ants, bed bugs, chatterworms, beetles, and weevil.

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.
Example 1

  1.9 parts of Metofluthrin and 0.1 part of BHT are mixed uniformly into 98.0 parts of a binder (tab powder, starch) and an incense base material (wood powder, pesticide extracted chrysanthemum powder, etc.), followed by a pigment and a preservative. Was added and kneaded. A stick-shaped mosquito coil (weight: 0.6 g) used in the present invention was obtained through an extruder. The smoke amount of the incense stick was 1010 as the smoke quantity index based on the measurement method, which was almost the same as that of the conventional regular incense stick.

Next, this incense was smoked before going to bed in a nearly sealed 6 tatami room, and the sustainability of the control effect was observed. As a result, the incense burned out in about 20 minutes, and smoke was temporarily drifted, but it became diluted to the extent that it could not be felt thereafter. It was very easy to use because it was not bothered by the arrival of mosquitoes for about 7 hours of bedtime and was not bothered by smoke.
(Example 2)

  45 parts of charcoal powder, 15 parts of wood powder, 21 parts of inorganic powder such as diatomaceous earth, and 14.6 parts of binder (starch, sodium salt of carboxymethyl cellulose) were mixed well. Next, add 3.2 parts of transfluthrin, 0.8 part of a surfactant (polyoxyethylene sorbitan fatty acid ester), 0.1 part of lavender oil, and 0.3 part of a preservative in water. The mixture was kneaded and a cone-shaped mosquito coil (weight: 0.8 g) was formed using a hydraulic press. This incense corresponded to a fine smoke incense with little smoke, and the smoke amount was 359 as the smoke amount index based on the measurement method.

Next, in the evening, this incense was smoked in a living room of about 10 tatami mats, and the sustainability of the control effect was observed. As a result, the incense burned out in about 30 minutes, but then the insecticidal component remained sufficiently in the air until midnight, and mosquitoes and other various pests did not approach. The amount of smoke was less than that of the incense stick of Example 1, while the fragrance of lavender oil drifted and the mood was relaxed, making it suitable for use in the living room.
(Examples 3 to 7)

According to Example 1 and Example 2, the mosquito coils of Examples 3 to 7 described in Table 1 were prepared, and the following tests were performed. The results are summarized in Table 2.
(1) in the middle of the field insecticidal efficacy room 25 m ³ was completely closed test at room 25 m ³ is smoked about 20 minutes The test mosquito coils. 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 smoke and 7 hours after smoke.
(2) Smoke measurement Smoke was smoked for 3 minutes in a transparent cylinder (diameter 19 cm, height 43 cm), and after 2 minutes of smoke diffusion, the sensor (OMRON smart sensor, ZX-LT010 transmission type sensor head) The light reception level of the laser beam passing through the cylinder was detected. The difference between the blank display value with nothing in the cylinder and the display value at the end of the measurement using the incense stick was determined as the smoke quantity index.

As a result of the test, as an insecticidal component, a pyrethroid compound having a vapor pressure of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg at 30 ° C., preferably one or two selected from metfurthrin, profluthrin and transfluthrin According to the method for controlling pests of the present invention using the mosquito coils containing the above, the insecticidal effect was extremely excellent for 7 hours or more even after a short smoking treatment for 15 to 30 minutes. Since the conventional mosquito coil (Comparative Example 2) normally smokes continuously for 7 and a half hours, of course, it maintains a certain insecticidal effect during this period. In the mosquito coil used in the present invention, The fact that the initial high insecticidal effect lasts for more than 7 hours with little reduction despite the short smoking time is a surprising finding.
Sustained insecticidal effect in this incense incense form is recognized not only in Examples 3 and 5 having a regular smoke amount, and in Examples 4, 6 and 7 (smoke type) with low smoke, In addition, when the smoke amount was calculated as the total amount accumulated in the room, it was less than 5% relative to the conventional long-term smoke incense. Therefore, the person who hates smoke does not care so much, and the merit in actual use is great.
On the other hand, as in Comparative Example 1, when d, d-T80-praretrin, which has a relatively low vapor pressure, was used as an insecticidal component, the insecticidal effect decreased rapidly with time. From these test results, the insecticidal component is a pyrethroid compound having a vapor pressure of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg at 30 ° C., preferably one selected from metfurthrin, profluthrin, and transfluthrin. The effect and usefulness of selecting two or more were demonstrated.
(Example 8)

A stock solution is prepared by dissolving 20 mg of transfluthrin, 2.0 mg of BHT, and a trace amount of blue dye in 100 mg of kerosene, and impregnated on a mat made of pulp / linter (size: 22 × 35 mm, thickness: 2.8 mm). The mosquito-removing mat of Example 8 was obtained.
Next, in a nearly sealed 6 tatami room, this mosquito-removing mat was placed on a heating plate (heating temperature: 180 ° C.) of an electric mosquito-removing instrument before sleeping and heated for 30 minutes to observe the sustainability of the control effect. A timer was used so that heating was turned off in 30 minutes. As a result, also in this example, as in the case of the mosquito coil, the mosquito was not bothered for about 7 hours of bedtime.
(Examples 9 to 11)

According to Example 8, the mosquito-removing mats of Examples 9 to 11 shown in Table 3 were obtained.
Next, this mosquito-removing mat was placed on a heating plate of an electric mosquito-removing device, and the heating plate was heated under the conditions shown in Table 3, and the “practical insecticidal efficacy test in a 25 m ³ room” conducted in Examples 3-7. Was carried out. The results are summarized in Table 3.

As a result of the test, a pyrethroid compound having a vapor pressure at 30 ° C. of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg as an insecticidal component, preferably methfluthrin as well as the results of Examples 3 to 7 in the mosquito collecting mat According to the pest control method of the present invention containing one or more selected from profluthrin and transfluthrin, even a short heat transpiration treatment of 30 to 60 minutes is extremely excellent over 7 hours thereafter. Retained insecticidal effect.
On the other hand, when d, d-T80-praretrin having a relatively low vapor pressure is used as an insecticidal component, as in the conventional mosquito-repelling mat of Comparative Example 3, the insecticidal effect is rapidly increased with the passage of time. Declined. From these test results, the insecticidal component is a pyrethroid compound having a vapor pressure of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg at 30 ° C., preferably one selected from metfurthrin, profluthrin, and transfluthrin. The effect and usefulness of selecting two or more were demonstrated.
(Example 12)

45 mL of a stock solution consisting of 2.0% by mass of metfurthrin, 0.1% by mass of BHT, and 97.9% by mass of kerosene is filled in a plastic container, and a liquid absorbent core (using polyester fiber as a material, diameter 7 mm through an inner plug) A round bar shape having a length of 70 mm) was attached to obtain a liquid electric mosquito trap used in the present invention.
Next, this liquid electric mosquito catcher is loaded into an electric mosquito catcher (set temperature of a ring-shaped heating element installed around the top of the liquid absorption core: 135 ° C), and is evaporated by heating in a room of about 8 tatami mats for about 1 hour. The durability of the control effect was observed. As a result, as in the case of the mosquito-removing mat of Example 8, the mosquito is not bitten for about 10 hours, and the heat-transpirated insecticide component remains in the air for a long time after the heating. Indicated.

[Relationship between cross-sectional area of mosquito coils and volatilization rate and burning rate of insecticidal components]
Next, the mosquito coils of the present invention were prepared according to the formulation shown in Table 4, and the relationship between the volatilization rate of the insecticidal component and the burning rate when the cross-sectional area of each mosquito coil was changed was measured. Specifically, the volatilization rate was measured by trapping and analyzing the amount of the insecticidal component that was volatilized, and the burning rate was measured by measuring the time during which the incense burns 10 cm. The results are shown in Tables 5-7.

Treatment chemicals used for pest control, not limited to mosquito coils, are ideal to volatilize all blended insecticidal components in the air, but at least blended because the insecticidal components are decomposed by the fire during combustion It is preferable to volatilize 60% of the insecticidal component in the air.
Looking at the measurement results in Table 5 and Table 6, the volatilization rate of any of the mosquito coils in Test Examples 1, 2, and 3 varies depending on the size of the cross-sectional area, but in the range where the cross-sectional area is about 1 to 80 mm ^2. The volatilization rate of the insecticidal component was good. Furthermore, if the cross-sectional area is too large, the mosquito coil is too thick, which makes it difficult to handle during use. Also, if the cross-sectional area is too small, the mosquito coil is too thin and the mosquito coil is broken during use.
From the above results, it is understood that the cross-sectional area is preferably in the range of about 1 to 80 mm ^{2 in} consideration of ease of handling during use.

In addition, in the mosquito coil of the present invention, since the insecticidal effect is expressed and sustained by short-term smoke, from the measurement results in Table 7, the cross-sectional area is in the range of about 1 to 80 mm ² . It can be seen that a combustion rate in the range of about 10 to 120 minutes / 10 cm is preferable.

  The pest control method of the present invention may be used not only for pest control but also in various fields such as antibacterial, deodorant, and fragrance.

Claims (3)

A treatment agent containing one or more compounds selected from pyrethroid compounds having a vapor pressure at 30 ° C. of 2 × 10 ⁻⁴ to 1 × 10 ⁻² mmHg as an insecticidal component,
Smoke or heat transpiration within 1 hour,
The particle diameter of the treatment agent containing the insecticidal component that volatilizes in the air is 1 μm or less,
A method for controlling pests, characterized by providing an atmosphere capable of controlling pests for 5 hours or more. The treatment agent is
0.5 to 5.0% by weight of the insecticidal component,
A binder,
An incense base material;
The pest control method according to claim 1, comprising one or more di-tert-butyl-phenol stabilizers having a boiling point of 250 ° C. or more. The pyrethroid compound is
The method for controlling pests according to claim 1 or 2, wherein the pest control method is one or more compounds selected from metfurthrin, profluthrin, and transfluthrin.