HK40046609B - Aerosol agent for insect pest control and insect pest control method - Google Patents

Description

Aerosol for pest control and pest control method

Technical Field

The present invention relates to an aerosol for pest control, which is obtained by filling a pressure-resistant container provided with a spray button with an aerosol liquid and a spray agent, and a pest control method using the aerosol.

Background

In general, pest control aerosol agents used outdoors are classified into: the insect pest control agent is used for (1) direct-impact type spraying with the aim of controlling insect pests hidden on the back surfaces of clusters and leaves or at hidden places, (2) type spraying with the aim of spraying with an integrated space of plant bodies or hidden places or the vicinity thereof, and (3) type spraying with aerosol insecticide on the solid surfaces such as outer walls, window glass and ground in advance to embed insect pests. Basically, the direct impact type of (1) requires quick action, and therefore, tetramethrin and the like are widely used as quick-acting pyrethroid insecticidal components. On the other hand, in the buried type of (3), since the residual efficacy is required, an insecticidal component having a low vapor pressure and lacking volatility is often used.

In contrast, in recent years, people who spend time outdoors (including terraces, balconies, etc.), or engage in home gardening, courtyard work, etc., have been increasing, called outdoor life. With this, there is a growing opportunity for insects, particularly mosquitoes, represented by aedes, to become bothered in the vicinity of clusters, shelters, etc., and there is an increasing demand for aerosol for controlling insect pests of the type (2) above.

As for the type (2) above, there is an attempt to spread an aqueous aerosol containing a pesticidal component having a high vapor pressure on a solid phase surface of an environment in which pests fly, to form a pesticidal component barrier, and to prevent flying pests from being separated from humans prophylactically. For example, patent document 1 (japanese patent No. 4703172) describes: an outdoor single-liquid aqueous aerosol having a pH of 5 to 7, which comprises 30 to 70% by volume of an aerosol-containing collagen liquid containing a normal-temperature volatile pyrethroid insecticidal component, a lower alcohol having 1 to 3 carbon atoms, a glycol having 3 to 6 carbon atoms and water, and 30 to 70% by volume of a spray containing dimethyl ether, is sprayed on one surface of a tent, and as a result, a barrier of the pyrethroid insecticidal component is formed around the tent, and flying insects are prevented from entering the tent for 10 hours or more. However, the aerosol of patent document 1 uses a volatile organic compound (hereinafter, abbreviated as VOC) as a propellant, and thus there is a room for environmental investigation.

Further, patent document 2 (japanese patent application laid-open No. 2010-161957) discloses a method for preventing invasion of pests, which comprises filling a compressed gas with a diol having 3 to 6 carbon atoms containing a normal-temperature volatile pyrethroid-based insecticidal component and a volatilization regulator thereofAn aerosol as a propellant having an average spray particle diameter of 50 to 150 mu m and a treatment amount of the normal-temperature volatile pyrethroid insecticidal component on the surface to be treated of 0.5mg/m ² By spraying in the above manner, a barrier space for the above-mentioned normal-temperature volatile pyrethroid insecticidal component is formed above the surface to be treated, and invasion of pests into the space is prevented for 6 hours or more. In comparison with patent document 1, the technique of patent document 2 is said to take some environmental consideration in that compressed gas is used instead of dimethyl ether as the propellant.

However, VOC limitation has become strict year by year, for example, in the case of the united states, it is generally required to suppress the VOC amount of each product to 30 mass% or less, and to reduce to 25 mass% or less depending on the kind of product. In the aerosol of patent document 2, in order to form a one-pack aqueous formulation, a lower alcohol having 2 to 3 carbon atoms is blended in an amount of 20 to 80v/v% in the aerosol, and there are still cases where the VOC cannot be regulated in the united states.

In addition, in either of patent document 1 and patent document 2, the test of the pest control efficacy (here, the control effect means a broad concept including an insecticidal effect, a repellent effect, an invasion preventing effect, and the like) is limited to a test for pests whose sensitivity to pyrethroid-based insecticidal components is not reduced, and nothing is mentioned about pests whose sensitivity is reduced, particularly mosquitoes.

Prior art literature

Patent literature

Patent document 1: japanese patent No. 4703172

Patent document 2: japanese patent application laid-open No. 2010-161957

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an aerosol for controlling pests for outdoor use which is effective for controlling pests, particularly mosquitoes, by forming a barrier space of a pyrethroid insecticidal component which is volatile at normal temperature above an object to be treated, after spraying an aerosol containing the pyrethroid insecticidal component which is volatile at normal temperature to the object to be treated outdoors such as a terrace or a balcony, and which is excellent in adhesion to the surface to be treated and effective formation of the barrier space, and which is also effective for pests having reduced sensitivity to the pyrethroid insecticidal component, without causing any problem in terms of VOC restriction, and a pest control method using the aerosol for controlling pests.

Means for solving the problems

The following constitution of the present invention has been found to exert excellent effects for achieving the above object.

(1) An aerosol for pest control, which is obtained by filling a pressure-resistant container provided with a spray button with an aerosol collagen liquid and a spray agent,

the aerosol collagen liquid has a VOC content of 30 mass% or less and contains:

(a) Vapor pressure at 30℃is 2X 10 ^-4 ～1×10 ^-2 0.01 to 3.0 mass% of normal temperature volatile pyrethroid insecticidal component with mmHg;

(b) 0.5 to 10 mass% of glycol ether compound with boiling point of 160 to 320 ℃;

(c) 0.2 to 5.0 mass% of a nonionic surfactant and/or an anionic surfactant; and

(d) Water residual mass%.

(2) The aerosol formulation for controlling pests according to (1), wherein the aerosol formulation is prepared by mixing the aerosol collagen solution with the propellant from the spray button, wherein the amount of the pyrethroid-based insecticidal component volatile at room temperature (a) is 0.5 to 20mg/m ² When the aerosol stock solution is sprayed to an outdoor object to be treated, 60 mass% or more of the aerosol stock solution adheres to the surface of the object to be treated,

the (a) normal temperature volatile pyrethroid insecticide component contained in the aerosol stock solution is volatilized from the surface for 4 hours or more.

(3) The aerosol for pest control according to (1) or (2), wherein the VOC content is 25% by mass or less.

(4) The aerosol for pest control according to any one of (1) to (3), wherein the propellant is a compressed gas and/or HFO gas having a GWP value of 10 or less.

(5) The aerosol formulation for controlling pests according to any one of (1) to (4), wherein the aerosol collagen solution further contains (e) a lower alcohol having 2 to 3 carbon atoms in an amount of 15 mass% or less.

(6) The aerosol for controlling pests according to any one of (1) to (5), wherein the pest to be controlled is a pest having a reduced sensitivity to pyrethroid-based insecticidal components.

(7) The aerosol for controlling pests according to (6), wherein the pests are mosquitoes.

(8) The aerosol for controlling pests according to any one of (1) to (7), wherein the normal-temperature volatile pyrethroid-based insecticidal component is at least one selected from the group consisting of transfluthrin, bifenthrin and transfluthrin.

(9) The aerosol for controlling pests according to (8), wherein the pyrethroid insecticide component that is volatile at ordinary temperature is transfluthrin.

(10) The aerosol for pest control according to any one of (1) to (9), wherein the glycol ether compound is an aromatic glycol ether compound.

(11) The aerosol for pest control according to (10), wherein the aromatic glycol ether compound is at least one selected from the group consisting of ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, diethylene glycol monophenyl ether, diethylene glycol monobenzyl ether and propylene glycol monophenyl ether.

(12) The aerosol for pest control according to any one of (1) to (11), wherein the nonionic surfactant is at least one nonionic surfactant selected from the group consisting of polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene styrylphenyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyethylene glycol fatty acid esters, polyoxyethylene sorbitan fatty acid esters, polyoxyethylene glycerol fatty acid esters and polyalkylene amides of fatty acids,

the anionic surfactant is at least one anionic surfactant selected from polyoxyethylene styrylphenyl ether sulfate, polyoxyethylene alkyl ether sulfate and dodecylbenzene sulfate.

(13) The aerosol for pest control according to any one of (1) to (12), wherein the aerosol collagen liquid sprayed from the spray button has an average particle diameter of 70 to 160 μm.

(14) The aerosol formulation for controlling pests according to any one of (1) to (13), wherein the object to be treated is a floor surface of an outdoor terrace, a surface of a vinyl sheet provided outdoors, or an outdoor floor surface.

(15) A pest control method, comprising:

a spraying step of spraying the pest control aerosol formulation according to any one of (1) to (14) in an amount of 0.5 to 20mg/m based on the amount of the above-mentioned (a) normal-temperature volatile pyrethroid-based insecticidal component ² Is sprayed to an outdoor object to be treated; and

and a volatilizing step of volatilizing the (a) normal-temperature volatilizing pyrethroid insecticidal component contained in the aerosol collagen liquid attached to the surface of the object to be treated from the surface for 4 hours or more.

(16) The method for controlling pests according to (15), wherein the pest is controlled by a pest having a reduced sensitivity to pyrethroid-based insecticidal components.

(17) The method for controlling pests according to (16), wherein the pests are mosquitoes.

ADVANTAGEOUS EFFECTS OF INVENTION

The aerosol for pest control of the present invention is extremely useful because it can avoid restrictions even in the united states where VOC restrictions are strict. Further, according to the aerosol formulation for controlling insect pests and the method for controlling insect pests of the present invention, if the aerosol stock solution is treated with the propellant (e.g., a low GWP gas) from the spray button at (a) a treatment amount of the normal-temperature volatile pyrethroid-based insecticidal component of 0.5 to 20mg/m ² Is sprayed outdoorsWhen 60 mass% or more of the aerosol stock solution is adhered to the surface of the object to be treated, then a barrier space for controlling pests is formed above the object to be treated for 4 hours or more when (a) the normal-temperature volatile pyrethroid insecticidal component is volatilized from the surface of the object to be treated. As a result, it is possible to exert an excellent control effect on not only the insect pests having a high sensitivity to the pyrethroid-based insecticidal component but also the insect pests (particularly mosquitoes) having a low sensitivity to the pyrethroid-based insecticidal component.

Detailed Description

In recent years, VOC restrictions have become strict year by year due to environmental considerations, and for example, in the case of the united states, it is generally required to suppress the VOC amount of each product to 30 mass% or less, and to reduce the VOC amount to 25% or less depending on the kind of product. Herein, VOC (Volatile Organic Compounds) in the present specification is defined as a volatile organic compound having a boiling point of 320 ℃ or less. Specifically, examples of the propellant include glycol ether compounds, lower alcohols, ester solvents, hydrocarbon solvents, ketone solvents, and the like, liquefied Petroleum Gas (LPG), dimethyl ether (DME), and hydrofluorocarbons, but the present invention is not limited to these as long as the volatile organic compounds have a boiling point of 320 ℃ or less. Although HFO (hydrofluoroolefin) gas is a volatile organic compound having a boiling point of 320 ℃ or lower, HFO gas is not a VOC based on the U.S. Environmental Protection Agency (EPA), and thus, in this specification, HFO gas is also regarded as not a VOC. As described above, the aerosol agent as described in patent document 2 is very difficult to pass the standard of VOC limitation because it contains 20v/v% or more of a lower alcohol having 2 to 3 carbon atoms in order to form a one-pack aqueous formulation. Accordingly, the present inventors considered that the microemulsion-type aqueous aerosol formulation meets the present object, and conducted intensive formulation studies.

In addition, there are now various insect pests such as mosquitoes having reduced sensitivity to pyrethroid-based insecticidal components worldwide, and countermeasures against these insect pests are urgent. In the case where the decrease in sensitivity is attributed to activation of metabolic enzymes of pests, it is considered that the complexing piperonyl butoxide is effective, but no useful compound has been proposed to replace it. The present inventors have made intensive studies by re-examining the techniques of patent documents 1 and 2 listed above in view of the current situation that outdoor aqueous aerosol formulations widely penetrate as mosquito control means. As a result, it has been found that a glycol ether compound having a boiling point of 160 to 320℃and preferably an aromatic glycol ether compound is specifically effective against pests having reduced sensitivity to pyrethroid-based insecticidal components, particularly mosquitoes, and that the effect thereof can be used as a sensitivity-reducing countermeasure auxiliary agent, thereby completing the present invention.

The aerosol for pest control of the present invention is an aqueous aerosol for outdoor use having a VOC content of 30% by mass or less, wherein the aerosol stock solution contains 0.01 to 3.0% by mass, preferably 0.08 to 0.17% by mass, (a) has a vapor pressure of 2X 10 at 30 DEG C ^-4 ～1×10 ^-2 Pyrethroid insecticidal component with normal temperature volatility and mmHg. Examples of the pyrethroid-based insecticidal component include: transfluthrin, bifenthrin, vafluthrin, cycloprothrin, tefluthrin, bifenthrin, and the like. Among them, transfluthrin, methotrexate and profluthrin are preferable, and transfluthrin is more preferable, in view of the normal temperature volatility, pest control efficacy, stability, availability of the compound, and the like. The pyrethroid-based insecticidal composition listed above may be used alone or in a mixture of plural kinds. In addition, in the pyrethroid-based insecticidal composition, when an optical isomer or a geometric isomer based on asymmetric carbon exists in the acid moiety or the alcohol moiety, each or any mixture thereof is also included in the pyrethroid-based insecticidal composition usable in the present invention. If the content of the normal-temperature volatile pyrethroid-based insecticidal component (a) is less than 0.01 mass%, the pest control efficacy may be deteriorated, while if it exceeds 3.0 mass%, the properties of the aqueous aerosol composition may be impaired.

The pyrethroid insecticidal composition (a) volatile at normal temperature used in the present invention shows a direct impact effect and a contact effect on various flying pests or creeping pests. In addition, since the pyrethroid-based insecticidal component that is volatile at normal temperature slowly volatilizes from the sprayed solid phase surface (object to be treated) and forms an insecticidal component barrier in the environmental space above the solid phase surface, preventive control of flying insects can be effectively facilitated. In the present invention, the pesticidal effect, the knockdown effect, the repellent effect, the pest invasion preventing effect, and the like are collectively included and referred to as a pest control effect.

In the aerosol for controlling pests of the present invention, in order to enhance the effect of direct impact on pests, the pyrethroid-based insecticidal component (a) that is volatile at room temperature may be appropriately blended, and other insecticidal components may be appropriately blended. Examples of such insecticidal components include: and a non-volatile pyrethroid compound such as tetramethrin, bifenthrin, cyfluthrin, phenothrin, permethrin, fenpropathrin, permethrin, allethrin, propathrin, methotrexate, etc., a silicon compound such as flusilate, an organic phosphorus compound such as dichlorvos, fenitrothion, etc., a carbamate compound such as propoxur, dinotefuran, imidacloprid, clothianidin, etc. In the case of blending a hardly volatile pyrethroid compound, the blending amount is set to a level that does not affect the volatility of the normal-temperature volatile pyrethroid insecticidal component.

The aerosol for pest control of the present invention contains 0.5 to 10% by mass, preferably 1.0 to 5.0% by mass of (b) a glycol ether compound having a boiling point of 160 to 320 ℃ in an aerosol stock solution together with (a) a pyrethroid-based insecticidal component which is volatile at room temperature. If the amount is such, the VOC content relative to the entire aerosol is easily suppressed to 30 mass% or less even if the lower alcohol described later is further added. Here, the glycol ether compound functions not only as a solvent for the pyrethroid-based insecticidal component that is volatile at normal temperature, but also as a sensitivity-reducing countermeasure auxiliary for pests, particularly mosquitoes, that have reduced sensitivity to the pyrethroid-based insecticidal component. That is, the glycol ether compound according to the object of the present invention is not a function as a volatilization control agent (which may be referred to as a efficacy enhancer because of improving the persistence of the pest control effect) of the glycol compound disclosed in patent document 1 or patent document 2, but may be a function as a sensitivity-reducing countermeasure auxiliary for pyrethroid-based insecticidal components. In the past, a compound that enhances the original insecticidal effect against pyrethroid-sensitive pests has been often referred to as "efficacy enhancer", but in the present specification, a compound that reduces the degree of reduction in the control effect when the pest with reduced sensitivity is the object is defined as "sensitivity reduction countermeasure auxiliary" by distinguishing it from the conventional "efficacy enhancer". The mechanism of action of both is not clear, but the "efficacy enhancer" does not necessarily correspond to the "sensitivity reduction countermeasure aid". If the blending amount of the glycol ether compound is less than 0.5 mass%, the effect as a solvent is not only insufficient, but also the effect of reducing the reduction degree of the pest control effect is insufficient. On the other hand, if the amount exceeds 10% by mass, not only the pest control effect peaks, but also the amount of surfactant required for forming the microemulsion increases, and therefore the property as an aqueous aerosol may be affected.

The boiling point of the glycol ether compound (b) used in the aerosol for pest control of the present invention is 160 to 320 ℃ and is roughly classified into an aliphatic glycol ether compound and an aromatic glycol ether compound having an aromatic ring. Specific examples of the aliphatic glycol ether compound include: diethylene glycol monomethyl ether (trade name: methyl diethylene glycol, boiling point: 194 ℃), triethylene glycol monomethyl ether (trade name: methyl triethylene glycol, boiling point: 249 ℃), diethylene glycol monoisopropyl ether (trade name: isopropyl diethylene glycol, boiling point: 207 ℃), ethylene glycol monobutyl ether (trade name: butyl ethylene glycol, boiling point: 171 ℃), diethylene glycol monobutyl ether (trade name: butyl diethylene glycol, boiling point: 231 ℃), diethylene glycol monohexyl ether (trade name: hexyl diethylene glycol, boiling point: 259 ℃), diethylene glycol monoethylhexyl diethylene glycol, boiling point: 272 ℃), dipropylene glycol monopropyl ether (trade name: propyl Propylene Di Glycol, boiling point: 212 ℃), dipropylene glycol monobutyl ether (trade name: butyl Propylene Di Glycol, boiling point: 231 ℃), and the like.

Examples of the aromatic glycol ether compound include: ethylene glycol monophenyl ether (trade name: phenyl ethylene glycol, boiling point: 245 ℃), ethylene glycol monobenzyl ether (trade name: benzyl ethylene glycol, boiling point: 256 ℃), diethylene glycol monophenyl ether (trade name: phenyl diethylene glycol, boiling point: 283 ℃), diethylene glycol monobenzyl ether (trade name: benzyl diethylene glycol, boiling point: 302 ℃), propylene glycol monophenyl ether (trade name: phenyl propylene glycol, boiling point: 243 ℃), and the like.

In the present invention, these glycol ether compounds may be used alone or in a mixture of a plurality of types, but from the viewpoints of compatibility with a surfactant to be described later, and the action as an auxiliary agent for sensitivity reduction, it was confirmed that the aromatic glycol ether compound is superior to the aliphatic glycol ether compound in performance.

Propylene glycol (boiling point: 188 ℃) described as a volatilization regulator in patent documents 1 and 2 is a compound different from the glycol ether compound used in the present invention, and it was confirmed that it is not so effective as "sensitivity reduction countermeasure aid". That is, the substances used as the "volatilization control agent" and the "efficacy enhancer" do not necessarily act as "sensitivity reduction countermeasure auxiliary agents".

In order to prepare a microemulsion-type aqueous aerosol formulation, the aerosol formulation for pest control of the present invention contains 0.2 to 5.0 mass% of (c) a nonionic surfactant and/or an anionic surfactant. If the blending amount of the surfactant is less than 0.2 mass%, the microemulsion forming ability is lacking. On the other hand, if the blending amount of the surfactant exceeds 5.0 mass%, problems such as tackiness may occur on the surface to be treated by spraying, which is not preferable.

Examples of the nonionic surfactant include: polyoxyethylene styrylphenyl ether (active agent N-1), polyoxyethylene alkyl ether (active agent N-2), polyoxyethylene alkylphenyl ether (active agent N-3), polyoxyethylene polyoxypropylene alkyl ether (active agent N-4), polyethylene glycol fatty acid ester (active agent N-5), polyoxyethylene sorbitan fatty acid ester (active agent N-6), polyoxyethylene glycerol fatty acid ester (active agent N-7), and polyalkylene glycol amide of fatty acid (active agent N-8), and the like.

Examples of the anionic surfactant include: polyoxyethylene styrylphenyl ether sulfate (active agent A-1), polyoxyethylene alkyl ether sulfate (active agent A-2), and dodecylbenzene sulfate (active agent A-3), and the like.

The above-listed surfactants may be used alone or in a mixture of a plurality of types, but it is preferable to use at least one of the nonionic surfactant and the anionic surfactant in combination.

The aerosol for pest control of the present invention is an aqueous formulation prepared by using (d) water as an aerosol stock solution from the viewpoint of eliminating VOC problems and minimizing phytotoxicity to plants. (d) The amount of water to be blended is preferably about 70 to 95% by mass based on the remaining mass of the aerosol collagen liquid excluding the above-mentioned (a) normal-temperature volatile pyrethroid insecticidal component, (b) glycol ether compound and (c) nonionic surfactant and/or anionic surfactant.

Preferably, the aerosol collagen liquid further contains (e) a lower alcohol having 2 to 3 carbon atoms in an amount of 15 mass% or less. The aerosol for pest control of the present invention may have some foamability, but by compounding the lower alcohol, an antifoaming effect can be produced and usability can be improved. In particular, when the blending amount of the nonionic surfactant and/or the anionic surfactant (c) is large, the advantage of blending a lower alcohol is large. The lower alcohol is typically ethanol or isopropyl alcohol (IPA), and the amount of the lower alcohol is preferably 15 mass% or less in the aerosol stock solution from the viewpoint of reducing the VOC amount. It should be noted that the compounding of the lower alcohol also has the following advantages: when an aerosol is produced using a low GWP gas as a propellant, the average particle diameter after spraying can be easily adjusted to 70 to 160 μm.

The aerosol for controlling pests of the present invention may contain other components, for example, solvents, acaricides, repellents, mildewcides, antibacterial agents, bactericides, stabilizers, deodorants, antistatic agents, fragrances, excipients, and the like, as long as the effects of the present invention are not impaired.

As the solvent, hydrocarbon solvents such as normal paraffins and isoparaffins, ester solvents, ketone solvents, and the like can be used. Examples of the acaricide include methyl 5-chloro-2-trifluoromethanesulfonamide benzoate, phenyl salicylate, and 3-iodo-2-propynylbutylcarbamate. Examples of the repellent include terpene insect repellent fragrances such as diethyltoluamide, elgaritine, terpineol, and geraniol. Examples of the antifungal agent, antibacterial agent, and bactericide include 2-mercaptobenzothiazole, 2- (4-thiazolyl) benzimidazole, 5-chloro-2-methyl-4-isothiazolin-3-one, oxazin, 3-methyl-4-isopropylphenol, and o-phenylphenol.

The aerosol for pest control of the present invention is prepared by filling the aerosol stock solution and the propellant in a pressure-resistant container. As the propellant, a low GWP gas is preferable. As the low GWP imparting gas, a GWP value [ global warming potential (Global Warming Potential) ] may be preferably used alone or in combination: representation of CO ₂ The value of the intensity of the heating effect when 1 is set is 10 or less, namely, compressed gas (nitrogen, carbon dioxide, nitrous oxide, compressed air, etc.), HFO (hydrofluoroolefin) gas. Among the compressed gases, nitrogen and carbon dioxide are easy to use, and nitrogen is particularly preferred. When compressed gas is used as the propellant, the scattering and adhesion efficiency of mist during the spraying process can be improved, the particle size of the mist can be increased, the safety to smoke and fire can be improved, and the inhalation risk of the mist particles can be reduced. On the other hand, as typical gases of HFO gas, HFO-1234ze (product name: solid size) and HFO-1234yf (product name: solid yf) are mentioned, but not limited thereto. This HFO gas is excellent in compatibility with an aerosol stock solution, and is not VOC based on EPA in the united states, and therefore is a preferred propellant in the present invention.

In the aerosol for controlling pests of the present invention, a small amount of a conventional propellant such as Liquefied Petroleum Gas (LPG), dimethyl ether (DME), or hydrofluorocarbon may be used in combination for the purpose of stabilizing the liquid properties, as long as the usefulness thereof is not impaired or the VOC content is not exceeded, but it is preferable that the conventional propellant is not contained if the gist of the present invention is contrasted.

The aerosol for pest control of the present invention is preferably one in which the average particle diameter of the aerosol collagen liquid after spraying is adjusted to 70 to 160. Mu.m. It is considered that the spray particles having an average particle diameter of 70 to 160 μm are relatively coarse particles, and if the average particle diameter is in such an average particle diameter range, a barrier space based on (a) a pyrethroid insecticide component that volatilizes at room temperature can be effectively formed, and the spray composition can contribute to an improvement in the control effect as compared with the case where the average particle diameter of the aerosol collagen liquid after spraying is small.

The aerosol for controlling insect pests of the present invention may be appropriately provided with a valve, a button, a spout, a nozzle, or the like according to the purpose, the purpose of use, the insect pest to be treated, and the like, and is preferably provided with a spray button capable of spraying reversely in view of the fact that the object to be treated is mainly an outdoor solid surface (for example, an outdoor terrace, a floor surface of a balcony (made of wood or concrete), a surface of a vinyl sheet provided outdoors, an outdoor floor surface, or the like). Further, the following structure is preferable: the aerosol stock solution and the propellant are treated together from the spray button to a treatment amount of 0.5-20 mg/m with (a) a pyrethroid insecticidal component volatilizing at normal temperature ² When the aerosol stock solution is sprayed to the outdoor solid phase surface, 60 mass% or more of the aerosol stock solution adheres to the solid phase surface, and the (a) normal-temperature volatile pyrethroid insecticidal component contained in the aerosol stock solution is volatilized from the solid phase surface for 4 hours or more.

The formation of an effective barrier space requires more than a certain treatment area. For example, when the surface to be processed is a flat surface, the processing area is preferably 2m or more×2m or more (4 m ² Above), more preferably 3m or more×3m or more (9 m) ² The above). On the other hand, when setting the surface to be treated adjacent to an upright object such as an entrance of a balcony, a window frame having a window, or an entrance of a tent, it is preferable to perform spraying with a width along the surface to be treated of the upright object of 1.5m or more. It should be noted that the barrier space may vary depending on the environmental conditionsThe space is defined as a space in which the surface to be treated (sprayed surface) is zero and a height of about 2 to 2.5m from the surface to be treated is included.

Specific examples of the present invention include the above-described cases: access to terraces or veranda, laundry airing, access to halls, outdoor life such as gardening in courtyards, access to tents in camping, outdoor barbecuing, lunch scenes in picnics, and the like.

In the aerosol formulation for controlling pests of the present invention, (b) the glycol ether compound also functions as an auxiliary agent for reducing the sensitivity of (a) the pyrethroid-based insecticidal component which is volatile at normal temperature. Therefore, the pyrethroid-sensitive strain shows a practical control effect on insects having reduced sensitivity, particularly culex pallidum, culex trilobata, culex tiredness, culex species such as culex hararies, aedes albopictus, aedes aegypti, and midge species such as midge, and thus has extremely high usefulness. It is considered that the effect is not small even for various flying insects such as houseflies, mao E flies, gnats, tabanus, midges, membranous wings, leafhoppers, etc., creeping insects such as ants, psyllids, and pillworms, and is particularly characteristic for mosquitoes.

Examples

Next, the pest control aerosol of the present invention eliminates VOC problems and exhibits excellent control effects on pests having reduced sensitivity to pyrethroid-based insecticidal components, based on examples.

Example 1 ]

A200 mL pressure-resistant vessel was charged with 0.22g (0.11 mass%) of transfluthrin, 3.0g (1.5 mass%) of (b) phenyl diglycol (boiling point: 283 ℃ C.), 0.2g (0.10 mass%) of (c) polyoxyethylene styrylphenyl ether (active agent N-1) and 1.0g (0.51 mass%) of polyoxyethylene styrylphenyl ether sulfate (active agent A-1) as (a) normal-temperature-volatile pyrethroid insecticidal component, and 21.6g (27 mL,11 mass%) of (e) ethanol, to prepare a drug mixture, and further (d) water was added to prepare a total of 200mL (195 g) of an aerosol collagen solution. The container was fitted with a valve portion, and about 2g of nitrogen gas was pressurized and filled with a spray button capable of being sprayed upside down by the valve portion, to prepare an aerosol for pest control of example 1. The VOC content of the aerosol (aerosol collagen liquid) was 15 mass% or less, and it was determined that no problem in VOC limitation occurred. The average particle diameter of the spray particles when the aerosol content was sprayed from the valve portion was 97. Mu.m.

The aerosol for pest control of example 1 was sprayed upside down with respect to a wooden floor surface adjacent to an entrance/exit of a balcony for about 6 seconds so as to attach about 19mg (about 3.2 mg/m) as transfluthrin ² ). In this case, since the average particle diameter of the spray particles sprayed from the valve portion of the aerosol is about 97 μm as described above, the spray particles are relatively coarse, and therefore, the spray particles do not scatter away from the object to be treated in a large amount, and as a result, there is little possibility of sucking the spray particles, and the spray treatment can be performed safely. In addition, the spray particles dry relatively quickly, without fear of the feet slipping on the floor surface being treated. After the spraying treatment, the amount of the deposited transfluthrin on the floor surface was analyzed, and the deposition efficiency of the sprayed particles was examined, and found to be 84%, which was considered to be very high. Then, a barrier space based on transfluthrin is effectively formed above the floor surface, and when clothes are dried on a balcony, the clothes are not bothered by pests such as Aedes albopictus and the like, and flying pests can be prevented from invading into a room from an entrance and an exit of the balcony for 8 hours. Further, the same test was carried out in thailand where the habitation of culex tiredness with the sensitivity of the pyrethroid-based insecticidal component was observed to be reduced, and the same results were confirmed to have an excellent control effect.

< examples 2 to 14, comparative examples 1 to 9>

Various aerosol formulations of examples 2 to 14 shown in table 1 were prepared according to example 1, and the following adhesion test and control efficacy test were performed. For comparison, the same tests as in examples were also performed for each of the aerosol formulations of comparative examples 1 to 9 shown in table 2. Note that, in tables 1 and 2, the content (mass%) of (a) the normal-temperature volatile pyrethroid insecticidal component, (b) the content (mass%) of the glycol ether compound, and (c) the content (mass%) of the nonionic surfactant and/or the anionic surfactant are calculated by taking the specific gravity thereof as 1.0.

(1) Adhesion test of aerosol stock solution to surface to be treated

Will be 0.583m ² The glass plate (9 glass plates 24 cm. Times.27 cm) was placed on the floor surface, and the aerosol to be tested was applied by spraying for 1 second from a distance of 50cm above. The amount of the pyrethroid-based insecticidal component adhered to 1 glass plate was analyzed and converted into an entire area, and the adhesion rate (%) to the amount of the pyrethroid-based insecticidal component sprayed was calculated. The results are shown in Table 3.

(2) Test for efficacy against mosquitoes

The test for efficacy was performed in a 6 tatami room set to a half open condition. Specifically, a 20-mesh net was attached to the door of the inlet and opened, and a ventilator (ventilation condition: about 5.3 times/hr) was started. According to the adhesion test (1), the test aerosol was sprayed in other rooms at a distance of 0.583m ² After the glass plate is stored for a prescribed time, the glass plate is arranged in the center of the floor surface of the test room. Then, about 100 test insects (culex light colored female adults having sensitivity or reduced sensitivity to pyrethroid-based insecticidal components) were immediately released, and the number of drops to both arms with time was counted while the test person walked around the treated glass plate, and the repellent ratio was determined by the following formula. The results are shown in Table 3.

Repellent ratio (%) = [ number of flying insects in no-treatment area-number of flying insects in treatment area ]/[ number of flying insects in no-treatment area ] ×100

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TABLE 3

As a result of the test, it was found that the aerosol for controlling insect pests of the present invention, which comprises a pressure-resistant container provided with a spray button, wherein the aerosol for controlling insect pests contains 0.0 to 3.0 mass% of (a) a normal-temperature volatile pyrethroid insecticidal component, 0.5 to 10 mass% of (b) a glycol ether compound having a boiling point of 160 to 320 ℃, 0.2 to 5.0 mass% of (c) a nonionic surfactant and/or an anionic surfactant, and the remaining mass% of (d) water, was filled with a microemulsion-type aerosol liquid containing 0.0 to 3.0 mass% of (b) a glycol ether compound having a boiling point of 160 to 320 ℃ together with a spray agent, and, after that, the aerosol liquid was gradually volatilized to a space above the surface of the object to be treated, was found that the aerosol liquid was excellent in the effect of repelling the mosquito species having sensitivity to the pyrethroid insecticidal component, even after 4 hours or more and 12 hours. As apparent from the reference to examples 2, 11, 12 and 8, as the pyrethroid-based insecticidal ingredient, transfluthrin, bifenthrin and profluthrin are not suitable for the purposes of the present invention. Among them, transfluthrin has high usefulness, and even for culex light in a line having reduced sensitivity to pyrethroid insecticidal components, the degree of decrease in control efficacy is small compared to the case of the pyrethroid-sensitive line, and it has been confirmed that transfluthrin is extremely effective in controlling these mosquitoes.

In comparative example 3 in which ethanol was excessively blended, the VOC content was not in accordance with the VOC limitation, and in the case where DME was mainly used as the propellant instead of the low GWP gas as in comparative example 7, the VOC content was also in excess of 30 mass%, which is not suitable. As shown in comparative example 2, when the blending amount of the glycol ether compound exceeds 10 mass%, the required surfactant becomes excessive, and there is a possibility that problems such as tackiness may occur on the surface to be treated by spraying, and also, comparative example 4 in which the boiling point of the glycol ether compound deviates from the range of 160 to 320 ℃ is not preferable. Further, regarding the surfactant, according to the comparison of example 2, example 9 and example 10, it is preferable to use a nonionic surfactant and an anionic surfactant in combination, and comparative example 6 using an amphoteric surfactant is inferior in performance. In comparative example 7, the average particle diameter was reduced, and the adhesion to the surface of the object to be treated was poor, which was not consistent with the gist of the present invention.

The effect of the glycol ether compound (b) having a boiling point of 160 to 320℃is also clear. That is, it was confirmed from the comparison of example 2, example 6, example 7, example 8, comparative example 4 and comparative example 5 that the phenyl diethylene glycol, benzyl diethylene glycol, butyl diethylene glycol and phenyl propylene glycol having boiling points in the range of 160 to 320 ℃ correspond to the (b) glycol ether compound of the present invention, and are also effective specifically for culex light with reduced sensitivity to pyrethroids, and can be used as a sensitivity reduction countermeasure auxiliary. The aromatic glycol ether compounds of example 2, example 6 and example 8 are more preferable in terms of performance than the aliphatic glycol ether compound of example 7. On the other hand, in the case of propylene glycol (comparative example 5, boiling point: 188 ℃) which is a compound different from the glycol ether compound and which is exemplified as the volatilization regulator in patent documents 1 and 2, like comparative example 4, the glycol ether compound having a boiling point outside the range of 160 to 320 ℃ is not sufficient to contribute to the durability of the repellent effect, but the action as a sensitivity reduction countermeasure auxiliary agent cannot be said to be sufficient. As for the content of (b) the glycol ether compound having a boiling point of 160 to 320 ℃, it was confirmed from comparison of example 2, example 13, example 14 and comparative example 9 that the glycol ether compound effectively functions as a sensitivity reduction countermeasure auxiliary agent against culex light with reduced sensitivity by adjusting the content of the glycol ether compound to a range of at least 0.5 to 10 mass%. As described above, the conventional volatilization control agent (generalized efficacy enhancer) does not necessarily correspond to the "sensitivity reduction countermeasure aid", and the present inventors have made an actual and satisfactory test on the basis of the trial and error, and have now clarified for the first time that a specific glycol ether compound can become the "sensitivity reduction countermeasure aid" intended in the present invention.

As described above, according to the aerosol formulation for controlling insect pests and the method for controlling insect pests of the present invention, in addition to eliminating VOC problems, it is of course effective against insect pests having a high sensitivity to pyrethroid-based insecticidal components, and also effective against insect pests having a reduced sensitivity, particularly mosquitoes, and therefore is extremely practical.

Industrial applicability

The aerosol formulation for controlling pests and the method for controlling pests of the present invention can be suitably used for outdoor use, but can of course be used indoors and can be used for the purpose of controlling a wide range of pests.

Claims (12)

1. An aerosol for pest control, which is obtained by filling a pressure-resistant container provided with a spray button with an aerosol collagen liquid and a spray agent,

the aerosol collagen liquid has a VOC content of 30 mass% or less and contains:

(a) Vapor pressure at 30℃is 2X 10 ^－4 mmHg～1×10 ^－2 0.01 to 3.0 mass% of normal temperature volatile pyrethroid insecticidal component with mmHg;

(b) 0.5 to 10 mass% of glycol ether compound with boiling point of 160 to 320 ℃;

(c) 0.2 to 5.0 mass% of a nonionic surfactant and/or an anionic surfactant; and

(d) The residual mass of water,

the aerosol collagen liquid further contains (e) a lower alcohol having 2 to 3 carbon atoms in an amount of 15 mass% or less,

the normal temperature volatile pyrethroid insecticidal component is at least one selected from the group consisting of transfluthrin, bifenthrin and profluthrin,

the glycol ether compound is at least one aromatic glycol ether compound selected from ethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, diethylene glycol monophenyl ether, diethylene glycol monobenzyl ether and propylene glycol monophenyl ether,

the nonionic surfactant is at least one nonionic surfactant selected from polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyethylene glycol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene glycerin fatty acid ester and polyalkylene glycol amide of fatty acid,

the anionic surfactant is at least one anionic surfactant selected from polyoxyethylene styryl phenyl ether sulfate, polyoxyethylene alkyl ether sulfate and dodecylbenzene sulfate.

2. The aerosol formulation for controlling insect pests according to claim 1, wherein the aerosol stock solution is mixed with the propellant from the spray button so that the amount of the (a) normal-temperature volatile pyrethroid-based insecticidal component is 0.5mg/m ² ～20mg/m ² When the aerosol stock solution is sprayed to an outdoor object to be treated, 60 mass% or more of the aerosol stock solution adheres to the surface of the object to be treated,

the (a) normal-temperature volatile pyrethroid-based insecticidal component contained in the aerosol stock solution is volatilized from the surface for 4 hours or more.

3. The aerosol formulation for pest control according to claim 1 or 2, wherein the VOC content is 25 mass% or less.

4. The aerosol formulation for pest control according to claim 1 or 2, wherein the propellant is a compressed gas and/or HFO gas having a GWP value of 10 or less.

5. The aerosol formulation for controlling pests according to claim 1 or 2, wherein the pest to be controlled is reduced in sensitivity to pyrethroid-based insecticidal components.

6. The aerosol for pest control according to claim 5, wherein the pest is a mosquito.

7. The aerosol formulation for controlling pests according to claim 1, wherein the pyrethroid insecticide component that is volatile at normal temperature is transfluthrin.

8. The aerosol formulation for pest control according to claim 1 or 2, wherein the aerosol collagen liquid sprayed from the spray button has an average particle diameter of 70 μm to 160 μm.

9. The aerosol formulation for controlling pests according to claim 1 or 2, wherein the object to be treated is a floor surface of an outdoor terrace, a floor surface of an outdoor balcony, a surface of a vinyl sheet provided outdoors, or an outdoor floor surface.

10. A pest control method, comprising:

a spraying step of forming the aerosol for controlling insect pests according to any one of claims 1 to 9 so that the amount of the (a) normal-temperature volatile pyrethroid-based insecticidal component is 0.5mg/m ² ～20mg/m ² Is sprayed to an outdoor object to be treated; and

and a volatilizing step of volatilizing the (a) normal-temperature volatilizing pyrethroid insecticidal component contained in the aerosol collagen liquid attached to the surface of the object to be treated from the surface for 4 hours or more.

11. The method for controlling pests according to claim 10, wherein the pest having a reduced sensitivity to pyrethroid-based insecticidal components is targeted for control.

12. The pest control method according to claim 11, wherein the pest is mosquitoes.