Composition for insect pest control and method for insect pest control

Abstract

Provided is a composition for insect pest control containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier. The pest control composition has a ratio (V12 / V1) of a natural pyrethrin transpiration rate V12 (mg / hour) after heating at 150°C for 12 hours to a natural pyrethrin transpiration rate V1 (mg / hour) after heating at 150°C for 1 hour of 0.2-1.0.

Description

Pest control composition and pest control method

[0001] The present invention relates to a pest control composition and a pest control method. This patent application claims the priority and benefits under the Paris Convention based on Japanese Patent Application No. 2024-230253 (filed on December 26, 2024), and the entire content described in the above application is incorporated herein by reference.

[0002] Due to the increasing natural orientation of consumers, natural pyrethrins have attracted attention (for example, Patent Document 1). Natural pyrethrins are suitably used for pest control, etc., but due to the instability of their chemical structure, the pest control effect may decrease over time or when exposed to high temperatures.

[0003] International Publication No. 2022 / 220294

[0004] An object of the present invention is to provide a pest control composition and a pest control method having an excellent pest control effect.

[0005] As a result of studying to find a pest control composition having an excellent pest control effect, the present inventor found that a pest control composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier, in which the ratio (V12 / V1) of the natural pyrethrin evaporation rate V12 (mg / hour) after heating at 150°C for 12 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 150°C for 1 hour is 0.2 to 1.0, is excellent in pest control effect and usability.

[0006] The present invention includes the following [1] to [7]. [1] A pest control composition comprising natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier, wherein the ratio (V12 / V1) of the natural pyrethrin evaporation rate V12 (mg / hour) after heating at 150°C for 12 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 150°C for 1 hour to V1 (mg / hour) after heating at 150°C for 150 hours is 0.2 to 1.0 (hereinafter sometimes referred to as the present invention composition). [2] The pest control composition according to [1], wherein the radical chain inhibitor comprises dibutylhydroxytoluene. [3] The insect control composition according to [1] or [2], wherein the peroxide decomposing agent comprises at least one selected from the group consisting of 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosfepin-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and tris(nonylphenyl) phosphite. [4] The insect control composition according to [1] or [2], wherein the peroxide decomposing agent comprises 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite). [5] A pest control composition according to any one of [1] to [4], wherein the mass ratio of the radical chain inhibitor to the peroxide decomposer is 1:0.078 to 1:100. [6] A pest control composition according to any one of [1] to [5], which is a pest control mat. [7] A pest control method comprising the step of evaporating natural pyrethrin into space at an evaporation rate of 0.2 mg / hour to 2.0 mg / hour for 12 hours.

[0007] The pest control composition and pest control method of the present invention have excellent pest control effects.

[0008] Figure 1 is a perspective view of a heat vaporization type insecticide device that uses an insect control mat.

[0009] The composition of the present invention comprises a natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier.

[0010] <Natural Pyrethrins> The natural pyrethrins used in this invention contain six compounds as active ingredients: pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmoline I, and jasmoline II. Natural pyrethrins can typically be obtained as an extract or dried pyrethrin powder, obtained by extracting the active ingredients from a powder made by collecting, drying, and grinding only the calyx of the flower of chrysanthemum (Tanacetum cinerariifolium or Chrysanthemum cinerariaefolium) using a suitable solvent (also called a solvent), such as an organic solvent like methanol. In addition to the six compounds mentioned above, natural pyrethrins may also contain plant-derived impurities (such as fatty acids and flavonoids).In addition to the aforementioned Chrysanthemum cinerariaefolium, other plants from which natural pyrethrins can be obtained include Calendula officinalis, Chrysanthemum coccinum, Tagetes erecta, Tagetes minuta, Zinnia elegans, and Zinnia linnearis (References 1: Adnane. H. Alain, C. & Chantal, B. 2000. The Production of Pyrethrins by Plant Cell and Tissue Cultures of Chrysanthemum cinerariaefolium and Tagetes Species. Critical Reviews in Plant Sciences, 19(1):69-89; Reference 2: Kudakasseril, GJ and Staba, EJ 1988. Insecticidal phytochemicals. In: Cell Culture and Somatic Cell Genetics of Plants. pp. 537-552. Constabel, F. and Vasil, IK, Eds., Academic Press, New York, Reference 3: John E. Casida, Gary B. Quistad. 1995. PYRETHRUM FLOWERS, Production, Chemistry, Toxicology, and Uses. pp. 123-125, Oxford University Press.).

[0011] The plant species and varieties that serve as the source of natural pyrethrins used in this invention are not limited to those mentioned above. The cultivation methods, cultivation conditions (weather, origin, soil type, etc.), harvest time, harvest part, harvesting method, washing method, extraction method, and purification method of the plants are not particularly limited. Natural pyrethrins used in this invention also include, for example, natural pyrethrins obtained using a vector into which a gene encoding a pyrethrin biosynthesis enzyme is incorporated.

[0012] The mass ratios of the six compounds used in the natural pyrethrins of the present invention—pyrethrin I, pyrethrin II, synerin I, synerin II, jasmolin I, and jasmolin II—are not particularly limited. Any mass ratio can be set for each compound in the range of 0.001 to 99% by mass relative to the total amount of natural pyrethrins. Typically, however, the natural pyrethrins are contained in the following mass ratios: pyrethrin I at 10 to 70% by mass, pyrethrin II at 10 to 70% by mass, synerin I at 1 to 20% by mass, synerin II at 1 to 20% by mass, jasmolin I at 1 to 20% by mass, and jasmolin II at 1 to 20% by mass, relative to the total amount of natural pyrethrins. As a specific example of a mixing ratio (mass ratio), [Pyrethrin I: Synerin I: Jasmolin I: Pyrethrin II: Synerin II: Jasmolin II] = 38.0:7.3:4.0:35.0:11.7:4.0 (Reference 3).

[0013] Examples of natural pyrethrins used in the present invention include pyrethrin I (total amount of pyrethrin I, synerin I, and jasmolin I) and pyrethrin II (total amount of pyrethrin II, synerin II, and jasmolin II), with pyrethrin I at 20 to 40% by mass and pyrethrin II at 12 to 31% by mass relative to the total amount of natural pyrethrin. The total amount of pyrethrin I and pyrethrin II in the natural pyrethrin is usually 10 to 99% by mass, preferably 15 to 90% by mass, and more preferably 20 to 85% by mass, relative to the total amount of natural pyrethrin.

[0014] The content of natural pyrethrin in the composition of the present invention is preferably 1 to 20% by mass, more preferably 1 to 10% by mass, and even more preferably 1.5 to 7% by mass, relative to the total amount of the composition of the present invention. Specific examples of natural pyrethrin content include 1% by mass, 1.5% by mass, 2% by mass, 2.5% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, and 20% by mass. These contents can also be expressed as "approximately." "Approximately" means plus or minus 10%, for example, "approximately 1% by mass" means 0.9% by mass to 1.1% by mass.

[0015] <Radical Chain Inhibitors> The radical chain inhibitors used in the present invention will now be described. In the present invention, a radical chain inhibitor means a compound that reacts with free radicals to produce stable molecules, thereby stopping chain reactions caused by free radicals. Examples of radical chain inhibitors include dibutylhydroxytoluene (hereinafter sometimes abbreviated as BHT) and butylhydroxyanisole (hereinafter sometimes abbreviated as BHA). Among these, BHT is preferred. BHT and BHA are commercially available, for example, from Kanto Chemical Co., Ltd. The content of the radical chain inhibitor in the composition of the present invention is preferably 0.1 to 10% by mass, more preferably 0.2 to 5% by mass, and even more preferably 0.5 to 3% by mass, based on the total amount of the composition of the present invention. Specific radical chain inhibitor contentes include 0.1% by mass, 0.2% by mass, 0.3% by mass, 0.4% by mass, 0.5% by mass, 0.6% by mass, 0.7% by mass, 0.8% by mass, 0.9% by mass, 1% by mass, 1.5% by mass, 2% by mass, 2.5% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, and 10% by mass.

[0016] The mass ratio of natural pyrethrin to radical chain inhibitor contained in the composition of the present invention is preferably 1:0.0033 to 1:3.2, more preferably 1:0.005 to 1:2.1, and even more preferably 1:0.02 to 1:0.53. Specific mass ratios include 1:0.004, 1:0.006, 1:0.007, 1:0.008, 1:0.009, 1:0.01, 1:0.03, 1:0.04, 1:0.05, 1:0.06, 1:0.07, 1:0.08, 1:0.09, 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.5, 1:2, 1:2.5, and 1:3. These mass ratios can also be expressed as "approximately." "Approximately" means plus or minus 10%, so for example, "approximately 1:2" means between 1:1.8 and 1:2.2.

[0017] <Peroxide Decomposing Agents> The peroxide decomposing agents used in the present invention will now be described. In the present invention, a peroxide decomposing agent means a compound that has the effect of decomposing peroxides and converting them into more stable compounds. Peroxide inhibitors include phosphorus-based antioxidants and sulfur-based antioxidants. Phosphorus-based antioxidants can be suitably used as peroxide decomposing agents. Furthermore, phosphorus-based antioxidants having substituted phenyl groups can be suitably used as peroxide decomposing agents. In addition, multiple peroxide decomposing agents may be used in combination. Specific peroxide decomposing agents include, for example, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and tris(nonylphenyl) phosphite. Among these, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, and tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite are preferred. 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite) (CAS registration number: 13003-12-8) is commercially available, for example, as JPH-1200 (manufactured by Johoku Chemical Industry Co., Ltd.). 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosfepin-6-yl)oxy]propyl}phenol (CAS registration number: 203255-81-6) is commercially available, for example, as SUMILIZER® GP (manufactured by Sumitomo Chemical Co., Ltd.).Tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite (CAS registration number: 96152-48-6) is commercially available, for example, as Adeka Stab 1500 (manufactured by ADEKA). Tris(nonylphenyl)phosphite (CAS registration number: 26523-78-4) is commercially available, for example, as Nocrac TNP (manufactured by Ouchi Shinko Chemical Industry Co., Ltd.). The content of the peroxide decomposing agent contained in the composition of the present invention is preferably 0.1 to 30% by mass, more preferably 0.5 to 20% by mass, and even more preferably 0.7 to 15% by mass, based on the total amount of the composition of the present invention. Specific contents of the peroxide decomposer include 0.1% by mass, 0.2% by mass, 0.3% by mass, 0.4% by mass, 0.6% by mass, 0.8% by mass, 0.9% by mass, 1% by mass, 2% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass. %, 12 mass%, 13 mass%, 14 mass%, 15 mass%, 16 mass%, 17 mass%, 18 mass%, 19 mass%, 20 mass%, 21 mass%, 22 mass%, 23 mass%, 24 mass%, 25 mass%, 26 mass%, 27 mass%, 28 mass%, 29 mass%, 30 mass%.

[0018] The mass ratio of natural pyrethrin to peroxide decomposing agent contained in the composition of the present invention is preferably 1:0.25 to 1:1, more preferably 1:0.5 to 1:1, and even more preferably 1:0.6 to 1:0.9. Specific mass ratios include 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, and 1:0.9.

[0019] The mass ratio of the radical chain inhibitor to the peroxide decomposing agent contained in the composition of the present invention is preferably 1:0.078 to 1:100, more preferably 1:0.23 to 1:50, and even more preferably 1:0.94 to 1:20. Specific ratios include 1:0.08, 1:0.09, 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:15, 1:20, 1:25, 1:30, 1:35, 1:40, 1:50, 1:60, 1:70, 1:80, 1:90, and 1:100.

[0020] <Solid Carriers> The solid carriers used in the present invention will now be described. In this specification, the solid carriers are not particularly limited as long as they do not impair the effects of the present invention, but examples of solid carriers include the following: Inorganic materials: Minerals (natural silicates, marble, pumice, limestone, rare earth minerals, cryolite, activated clay, lime, activated carbon, talc, attapulgite, sodium montmorillonite, calcium montmorillonite, kaolinite, calcite, dolomite, diatomite, bentonite, zeolite, sepiolite, pyrophyllite, vermiculite, crystalline silica, amorphous silica, etc.), silicon dioxide, calcium sulfate, magnesium sulfate, barium sulfate, magnesium oxide, aluminum oxide, ammonium sulfate, ammonium phosphate, ammonium nitrate, calcium phosphate, sulfur, calcium carbonate, sodium bicarbonate, sodium carbonate, synthetic silicates, and pulverized products thereof; Organic materials: grain powders (rice bran, rice flour, corn flour, wheat flour, etc.), sugars (cellulose, starch, lactose, glucose, fructose, sucrose, etc.), plant-derived powders (nut shell powders (coconut, walnut, peanut, etc.), tree-derived powders (bark powder, sawdust, etc.), other plant powders (tobacco stems, soybeans, cottonseed husks, etc.)), lignin, wax, seashells, urea, polyethylene, polypropylene, polyvinyl alcohol, polycarbonate, polyester, polyamide, polyurethane, polyvinyl chloride, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, polyvinylpyrrolidone-methacrylic acid copolymer, polyvinylpyrrolidone-vinyl acetate copolymer, cellulose derivatives, phenolic resins, melamine resins, epoxy resins. The above solid carriers may also be used as adsorbent carriers.

[0021] In one embodiment of the present invention, the solid carrier may be one or more solid carriers selected from the group consisting of minerals, silicon dioxide, calcium sulfate, magnesium sulfate, barium sulfate, magnesium oxide, aluminum oxide, ammonium sulfate, ammonium phosphate, ammonium nitrate, calcium phosphate, sulfur, calcium carbonate, sodium bicarbonate, sodium carbonate, synthetic silicates, grain powders, sugars, plant-derived powders, tree-derived powders, other plant pulverized materials, lignin, wax, seashells, urea, polyethylene, polypropylene, polyvinyl alcohol, polycarbonate, polyester, polyamide, polyurethane, polyvinyl chloride, polyvinyl acetate, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer, polyvinylpyrrolidone-methacrylic acid copolymer, polyvinylpyrrolidone-vinyl acetate copolymer, cellulose derivatives, phenolic resins, melamine resins, and epoxy resins.

[0022] In another embodiment of the present invention, the composition of the present invention is used as a pest control mat described later. In this case, for example, a blank mat material composed of a fibrous carrier or a porous carrier may be included in the solid carrier. Examples of such fibrous carriers include natural fibers such as pulp, cotton linters, cellulose, and cotton, synthetic fibers such as polyester and acrylic, and inorganic fibers such as glass fibers and asbestos. Examples of porous carriers include inorganic powders such as clay, talc, kaolin, silica, calcite, diatomaceous earth, gypsum, perlite, bentonite, acid clay, glass fiber, or asbestos, which are bonded together with an adhesive such as carboxymethylcellulose, starch, gum arabic, gelatin, or polyvinyl alcohol and formed into a mat; or inorganic substances such as clay, talc, bentonite, alumina, silica, or calcite are solidified into a mat and fired; resin is molded and processed into a mat; or glass fibers are bundled into a mat. The blank mat material may appropriately contain pigments, preservatives, fragrances, etc. During the bonding of the inorganic powder and the adhesive, the various components described above or below can be mixed and molded into a mat, thereby retaining the various components. The solid carriers used in this invention are all known solid carriers, and each can be manufactured or obtained by following or in accordance with known methods, or by obtaining commercially available products.

[0023] The content of the solid carrier in the composition of the present invention is preferably 30 to 60% by mass, more preferably 35 to 55% by mass, and even more preferably 40 to 50% by mass, based on the total amount of the composition of the present invention. Specific solid carrier contents include 30%, 35%, 40%, 45%, 50%, 55%, and 60% by mass.

[0024] In one embodiment of the present invention, the mass ratio of natural pyrethrin to solid carrier is preferably 1:3.5 to 1:70, more preferably 1:4.7 to 1:47, and even more preferably 1:5.8 to 1:35. Specific mass ratios of natural pyrethrin to solid carrier include 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:15, 1:20, 1:25, 1:30, 1:35, 1:40, 1:45, 1:50, 1:55, 1:60, and 1:65.

[0025] The composition of the present invention may also contain other formulation aids such as thickeners, surfactants, stabilizers, preservatives, or synergists, to the extent that they do not adversely affect the evaporation rate.

[0026] The composition of the present invention may contain other insecticidal active ingredients, solvents, dyes, stabilizers, fragrances, etc., as appropriate, to the extent that they do not adversely affect the evaporation rate of natural pyrethrins.

[0027] Examples of such solvents include ester-based solvents and hydrocarbon-based solvents. Specific examples of ester-based solvents include diisodecyl phthalate, di-2-ethylhexyl phthalate, diisopropyl adipate, diisobutyl adipate, diisodecyl adipate, di-n-octyl sebacate, diisononyl adipate, di-2-ethylhexyl sebacate, di-2-ethylhexyl azelate, di-n-hexyl azelate, di-2-ethylhexyl dodecanoate, dibutoxyethoxyethyl adipate, isopropyl palmitate, dioctyl adipate, di-n-butyl sebacate, acetyl tributyl citrate, di-2-ethylhexyl malate, isopropyl myristate, benzyl acetate, sucrose fatty acid esters, and sorbitan fatty acid esters. Examples of hydrocarbon-based solvents include n-paraffin-based solvents, isoparaffin-based solvents, and naphthenic solvents. Specific examples of n-paraffinic solvents include dodecane, tridecane, tetradecane, pentadecane, Norper 13 (trade name, manufactured by ExxonMobil Chemicals Ltd.), Norper 15 (trade name, manufactured by ExxonMobil Chemicals Ltd.), n-paraffin grade M (trade name, manufactured by Nippon Oil Corporation), n-paraffin grade H (trade name, manufactured by Nippon Oil Corporation), and Neothiosol (trade name, manufactured by Chuo Chemical Co., Ltd.). Specific examples of isoparaffinic solvents include Isopar M (trade name, manufactured by ExxonMobil), Isopar V (trade name, manufactured by ExxonMobil), IP Solvent 2028 (trade name, manufactured by Idemitsu Kosan Co., Ltd.), IP Solvent 2835 (trade name, manufactured by Idemitsu Kosan Co., Ltd.), and Shellsol™ (trade name, manufactured by Shell Chemicals Japan Co., Ltd.). Specific naphthenic solvents include, for example, Exol D80 (trade name, manufactured by ExxonMobil), Exol D110 (trade name, manufactured by ExxonMobil), and Exol D130 (trade name, manufactured by ExxonMobil). Kerosene can also be used. Other solvents include, for example, isopropanol, ethanol, propylene carbonate, 1,3-butylene glycol, polyoxyethylene hydrogenated castor oil, and olive oil.Among the solvents mentioned above, n-paraffinic solvents, isoparaffinic solvents, or naphthenic solvents can be suitably used. Two or more solvents may be used in combination, and solvents with different properties such as polarity can be combined. When solvents with different properties are used in combination in this way, one of them can be used as an auxiliary solvent. For example, when an n-paraffinic solvent, isoparaffinic solvent, or naphthenic solvent is used as the solvent, diisopropyl adipate or isopropyl myristate can be used as an auxiliary solvent. When the composition of the present invention contains a solvent, the solvent content (including the amount of auxiliary solvent if it further contains an auxiliary solvent) is preferably 20 to 65% by mass, more preferably 30 to 60% by mass, and even more preferably 35 to 50% by mass, based on the total amount of the composition of the present invention. Specific solvent content examples include 20% by mass, 25% by mass, 30% by mass, 35% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, 60% by mass, and 65% by mass.

[0028] Examples of such dyes include anthraquinone-based blue dyes such as 1,4-dibutylaminoanthraquinone, 1,4-diisopropylaminoanthraquinone, 1,4-bis(2,6-diethyl-4-methylphenylamino)anthraquinone, 1-methylamino-4-orthotolylaminoanthraquinone, 1-methylamino-4-methatolylaminoanthraquinone, and 1-methylamino-4-paratolylaminoanthraquinone. These dyes may be used individually, in combination of two or more, or mixed with other dyes of different colors. Examples of such stabilizers include ultraviolet absorbers such as benzotriazole-based ultraviolet absorbers and benzophenone-based ultraviolet absorbers.

[0029] <Production of the Composition> In one embodiment, a composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier can be produced by mixing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, other components selected as desired, and a solid carrier. In this case, the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired may be adsorbed onto the solid carrier to support the components. Alternatively, the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired may be impregnated into the solid carrier to support the components. In the above production method, the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired may be pre-mixed, or each component may be supported on the solid carrier simultaneously or separately without pre-mixing. In this case, it is preferable to pre-mix each component before supporting it on a solid carrier, and it is more preferable to pre-mix each component into a homogeneous solution before supporting it on a solid carrier. The methods and conditions for mixing and / or supporting each component on a solid carrier can be those of known methods and conditions.

[0030] In one embodiment of the present invention, the composition comprises a natural pyrethrin, at least one radical chain inhibitor selected from the group consisting of BHT and BHA, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphine-6-yl)oxy]propyl}phenol, at least one peroxide decomposer selected from the group consisting of tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite and tris(nonylphenyl) phosphite, at least one solvent selected from the group consisting of n-paraffinic solvents, isoparaffinic solvents and naphthenic solvents, and a matting material.

[0031] In one embodiment of the present invention, the composition comprises a natural pyrethrin, BHT, 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), an isoparaffinic solvent, and a matting material.

[0032] <Evaporation Rate> The composition of the present invention evaporates natural pyrethrin such that the ratio (V12 / V1) of the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 150°C for 12 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 150°C for 1 hour is in the range of 0.2 to 1.0. By formulating a composition containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposition agent, and a solid carrier, the evaporation rate of natural pyrethrin can be adjusted to a desired rate.

[0033] In this invention, the evaporation rate of natural pyrethrin after heating for X hours means the mass (mg / hour) of natural pyrethrin that evaporates per hour during a total heating time from X-1 hours to X hours. That is, for example, the evaporation rate of natural pyrethrin after heating for 12 hours means the mass (mg / hour) of natural pyrethrin that evaporates per hour during a total heating time from 11 hours to 12 hours. The evaporation rate after heating at 150°C for 12 hours is measured, for example, by the following method: A composition prepared using natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier is heated on a ceramic heater at 150°C, and the mass (mg / hour) of natural pyrethrin that evaporates per hour between 11 and 12 hours after the start of heating is analyzed. The evaporation rate (mg / hr) of natural pyrethrin can be determined by collecting the evaporated natural pyrethrin vapor in a urethane foam-packed column for a predetermined time, extracting it with acetone, and quantitatively analyzing the natural pyrethrin contained in the extract by high-performance liquid chromatography. Evaporation rates at other time points can be measured in the same manner.

[0034] In another embodiment of the present invention, the composition may evaporate natural pyrethrins at an evaporation rate of 0.2 mg / hour to 2.0 mg / hour for 14 hours by heating at 150°C. In yet another embodiment of the present invention, the composition may evaporate natural pyrethrins at an evaporation rate of 0.2 mg / hour to 2.0 mg / hour for 16 hours by heating at 150°C. In one embodiment of the present invention, the ratio (V12 / V1) of the natural pyrethrin evaporation rate V12 (mg / hour) after heating at 150°C for 12 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 150°C for 1 hour may be 0.2 to 1.0. Specific ratios (V12 / V1) include, for example, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, and 1.0.

[0035] One embodiment of the present invention is a composition comprising 1 to 20% by mass of natural pyrethrin, 0.1 to 10% by mass of a radical chain inhibitor, 0.1 to 30% by mass of a peroxide decomposer, 20 to 65% by mass of a solvent, and 30 to 60% by mass of a solid carrier, wherein the ratio (V12 / V1) of the natural pyrethrin evaporation rate V12 (mg / hour) after heating at 150°C for 12 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 150°C for 1 hour is 0.2 to 1.0. Another embodiment of the present invention is a composition comprising 1 to 20% by mass of natural pyrethrin, 1 to 10% by mass of BHT, 0.1 to 30% by mass of 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 20 to 65% by mass of an isoparaffinic solvent, and 30 to 60% by mass of a matting material, wherein the natural pyrethrin is evaporated at an evaporation rate of 0.1 mg / hour to 2.0 mg / hour for 12 hours by heating at 150°C.

[0036] The composition of the present invention is preferably used as an insect control mat.

[0037] <Insect Control Mat and Formulation for Insect Control Mat> One embodiment of the present invention is an insect control mat containing natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier. The insect control mat may also be referred to as an electric mosquito repellent mat. In this specification, "formulation for insect control mat" means a composition for manufacturing an insect control mat containing the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components selected optionally, and a solid carrier. In this case, it is preferable that the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected optionally are supported on the solid carrier. As one embodiment of the present invention, an insect control mat according to the present invention can be manufactured by molding and processing a composition containing the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components selected optionally, and a solid carrier, which is an insect control mat formulation, into an insect control mat of a desired shape. Another embodiment of the present invention is an insect control mat in which the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other optionally selected components are impregnated or adsorbed into the blank mat material, where the solid carrier is a blank mat material composed of a fibrous carrier or a porous carrier.

[0038] One embodiment of the present invention is an insect control mat manufactured by molding and processing a formulation for insect control mats.

[0039] The size of the blank mat material, which is made of a fibrous or porous carrier and used in one embodiment of the present invention, is typically 2.0 to 4.0 cm² in apparent volume before impregnation or adsorption and retention of the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired. 3 (For example, 2.2 cm x 3.5 cm x 0.28 cm (approximately 2.2 cm) 3 ), 3.8cm x 4.8cm x 0.20cm (approximately 3.6cm 3 It could be within the range of (a certain degree).

[0040] In one embodiment of the present invention, the pest control mat includes the blank mat material 2.2 cm 3per unit area, the total amount of the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected can usually be retained at 20 to 1600 mg. Another embodiment of the pest control mat of the present invention is a blank mat material having a size different from the apparent volume of the blank mat material exemplified above, and the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected are impregnated or adsorbed and retained, and the blank mat material is 2.2 cm 3 per unit area, it can be produced by molding and processing into a desired size so that the total amount of the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected is usually retained at 20 to 1600 mg.

[0041] Another embodiment of the pest control mat of the present invention is a pest control mat preparation containing the natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components optionally selected, and a solid carrier, and the pest control mat is 2.2 cm 3 per unit area, it can be produced by molding and processing the pest control mat so that the total amount of the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected can usually be retained at 20 to 1600 mg. The method of impregnating or adsorbing and retaining the natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components optionally selected on the blank mat material, and the method of molding and processing into a desired shape and size can be respectively implemented by applying known methods.

[0042] Furthermore, a method for molding and processing a pest control mat formulation containing the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components as desired, and a solid carrier into a desired pest control mat can be carried out by applying known methods. For example, such a pest control mat can be manufactured in a manner similar to that of a substrate used in an air treatment apparatus described in Japanese Patent Publication No. 2009-526056. Japanese Patent Publication No. 2009-526056 discloses a substrate having a pore network structure formed by adhering granular particles, in which air treatment chemicals such as natural pyrethrin can be supported within the pores. Such a substrate can be attached to an air treatment apparatus described in Japanese Patent Publication No. 2009-526056 and heated to release air treatment chemicals such as natural pyrethrin from the substrate. In other words, similar to the substrate of Japanese Patent Publication No. 2009-526056, a pest control mat can be manufactured by solidifying a formulation for pest control mats containing the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, other components selected as desired, and a solid carrier, and molding it into a predetermined shape. A pest control mat, which is one embodiment of the present invention, can appropriately contain other pest control active compounds, repellents, etc., which is expected to further improve its effectiveness.

[0043] One embodiment of the pest control mat is, for example, the pest control mat 11 used in a heat vaporization type insecticide device 200 as shown in Figure 1. In the heat vaporization type insecticide device 200 of Figure 1, the pest control mat 11 is placed on a hot plate 10, and by heating the hot plate to approximately 140 to 200°C, the natural pyrethrins and other substances held in the pest control mat are vaporized into the atmosphere, thereby controlling pests.

[0044] Further, the preparation for a pest control mat according to one embodiment of the present invention is a preparation capable of manufacturing a pest control mat used in a heat-evaporating type insecticidal device described in, for example, Japanese Patent Publication No. 11-510055. In the heat-evaporating type insecticidal device described in Japanese Patent Publication No. 11-510055, a fuel such as butane gas is burned to heat the pest control mat to about 120 to 200°C, and natural pyrethrin or the like held in the pest control mat is evaporated into the atmosphere, thereby controlling pests. That is, while the heat-evaporating type insecticidal device 200 shown in FIG. 1 heats the hot plate 10 by electric heating, the heat-evaporating type insecticidal device described in Japanese Patent Publication No. 11-510055 heats the hot plate in the device by burning a fuel such as butane gas. Although there are differences in the heat source and the heating temperature between the two, the principle of evaporating natural pyrethrin or the like held in the pest control mat into the atmosphere by heating is the same.

[0045] The preparation for a pest control mat according to one embodiment of the present invention is not limited to the device shown in FIG. 1, but can be applied to a heat-evaporating type insecticidal device using a conventionally known pest control mat by being molded and processed into the shape of a conventionally known pest control mat, and any of them can exhibit excellent effects.

[0046] In one embodiment of the present invention, the pest control mat contains natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a mat material as a solid carrier, and may further contain a solvent (also referred to as a solvent), a pigment, a stabilizer, a fragrance, etc. as appropriate.

[0047] Examples of such a solvent include the solvents exemplified for the above-described composition of the present invention.

[0048] The insect control mat may contain one or more of these solvents. When the insect control mat contains a solvent, the solvent content (including the amount of auxiliary solvents if further included) is preferably 20 to 65% by mass, more preferably 30 to 60% by mass, and even more preferably 35 to 50% by mass, based on the total amount of the insect control mat. Specific solvent content examples include 20% by mass, 25% by mass, 30% by mass, 35% by mass, 40% by mass, 45% by mass, 50% by mass, 55% by mass, 60% by mass, and 65% by mass.

[0049] In one embodiment of the present invention, the solid carrier is a blank mat material composed of a fibrous carrier, more specifically, pulp and cotton linters, and the composition of the present invention is an insect control mat in which the blank mat material contains the aforementioned natural pyrethrin, radical chain inhibitor, peroxide decomposer, and other components selected as desired. In this case, the insect control mat can be manufactured by impregnating the blank mat material with the following liquid composition (hereinafter referred to as "insect control mat chemical solution"): <Insect control mat chemical solution>

[0050] The content of natural pyrethrin in the insecticide solution for pest control mats used in the present invention is preferably 1 to 30% by mass, more preferably 1 to 20% by mass, and even more preferably 3 to 15% by mass, based on the total amount of the insecticide solution for pest control mats. Specific examples of natural pyrethrin content in the insecticide solution for pest control mats include 2% by mass, 3% by mass, 4% by mass, 5% by mass, 6% by mass, 7% by mass, 8% by mass, 9% by mass, 10% by mass, 11% by mass, 12% by mass, 13% by mass, 14% by mass, 15% by mass, 16% by mass, 17% by mass, 18% by mass, 19% by mass, 20% by mass, 21% by mass, 22% by mass, 23% by mass, 24% by mass, 25% by mass, 26% by mass, 27% by mass, 28% by mass, and 29% by mass.

[0051] The amount of radical chain inhibitor contained in the insecticide solution for pest control mats used in the present invention is preferably 0.1 to 3.2% by mass, more preferably 0.1 to 2.1% by mass, and even more preferably 0.3 to 1.6% by mass, based on the total amount of the insecticide solution for pest control mats. Specific examples of radical chain inhibitor content in pest control mat solutions include 0.2% by mass, 0.4% by mass, 0.5% by mass, 0.6% by mass, 0.7% by mass, 0.8% by mass, 0.9% by mass, 1.0% by mass, 1.1% by mass, 1.2% by mass, 1.3% by mass, 1.4% by mass, 1.5% by mass, 1.7% by mass, 1.8% by mass, 1.9% by mass, 2.0% by mass, 2.2% by mass, 2.3% by mass, 2.4% by mass, 2.5% by mass, 2.6% by mass, 2.7% by mass, 2.8% by mass, 2.9% by mass, 3.0% by mass, and 3.1% by mass.

[0052] The content of the peroxide decomposing agent in the insecticide solution for pest control mats used in the present invention is preferably 0.25 to 30% by mass, more preferably 0.5 to 20% by mass, and even more preferably 1.5 to 13.5% by mass, based on the total amount of the insecticide solution for pest control mats. Specific contents of the peroxide decomposer include 0.3% by mass, 0.4% by mass, 0.6% by mass, 0.7% by mass, 0.8% by mass, 0.9% by mass, 1.0% by mass, 2.0% by mass, 2.5% by mass, 3.0% by mass, 4.0% by mass, 5.0% by mass, 6.0% by mass, 7.0% by mass, 8.0% by mass, 9 .0 mass%, 10 mass%, 11 mass%, 12 mass%, 13 mass%, 14 mass%, 15 mass%, 16 mass%, 17 mass%, 18 mass%, 19 mass%, 21 mass%, 22 mass%, 23 mass%, 24 mass%, 25 mass%, 26 mass%, 27 mass%, 28 mass%, 29 mass%.

[0053] When the insecticide solution for pest control mats used in the present invention contains a solvent, the solvent content is preferably 40 to 98.65% by mass, more preferably 60 to 98.5% by mass, and even more preferably 71.5 to 95.5% by mass, based on the total amount of the insecticide solution for pest control mats. Specific solvent content examples include 45% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass, 80% by mass, 81% by mass, 82% by mass, 83% by mass, 84% by mass, 85% by mass, 86% by mass, 87% by mass, 88% by mass, 89% by mass, 90% by mass, 91% by mass, 92% by mass, 93% by mass, 94% by mass, 95% by mass, 96% by mass, 97% by mass, and 98% by mass.

[0054] In one embodiment of the insecticide solution for pest control mats, the insecticide solution for pest control mats contains 1 to 30% by mass of natural pyrethrin, 0.1 to 3.2% by mass of a radical chain inhibitor, 0.25 to 30% by mass of a peroxide decomposer, and 40 to 98.65% by mass of a solvent.

[0055] When manufacturing an insecticide mat by impregnating a blank mat material with a chemical solution for insecticide mats, the mass ratio of the blank mat material to the chemical solution for insecticide mats is preferably 1:0.43 to 1:2.3, more preferably 1:0.67 to 1:1.5, and even more preferably 1:1 to 1:1.5. Specific mass ratios of the chemical solution for insecticide mats to the blank mat material include 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2.0, 1:2.1, and 1:2.2.

[0056] One embodiment of the present invention is a pest control method comprising the step of evaporating natural pyrethrin into the air for 12 hours at a evaporation rate in the range of 0.2 mg / hour to 2.0 mg / hour.

[0057] One embodiment of the present invention is a pest control method that includes the step of heating a pest control mat and evaporating natural pyrethrin into the air for 12 hours at an evaporation rate in the range of 0.2 mg / hour to 2.0 mg / hour.

[0058] Another embodiment of the present invention is a pest control method comprising the step of evaporating natural pyrethrin into the air at a evaporation rate in the range of 0.2 mg / hour to 2.0 mg / hour for 14 hours. Yet another embodiment of the present invention is a pest control method comprising the step of evaporating natural pyrethrin into the air at a evaporation rate in the range of 0.2 mg / hour to 2.0 mg / hour for 16 hours. Yet another embodiment of the present invention is a pest control method comprising the step of evaporating natural pyrethrin into the air at a evaporation rate in the range of 0.2 mg / hour to 2.0 mg / hour for 16 hours. Specific ratios (R12 / R1) include, for example, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, and 1.0.

[0059] Another embodiment of the present invention is a method of controlling pests in which heating of the pest control mat is performed by placing the pest control mat on a hot plate and heating the pest control mat with the heated hot plate. Yet another embodiment of the present invention is a method of controlling pests in which heating with the hot plate is performed by heating the hot plate to a temperature of approximately 140 to 200°C (for example, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C) by electric heating. Yet another embodiment of the present invention is a method of controlling pests in which heating with the hot plate is performed by heating the hot plate to a temperature of approximately 120 to 200°C (for example, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C) by burning fuel.

[0060] Yet another embodiment of the present invention is a method for controlling pests, wherein the space from which the natural pyrethrin is evaporated includes at least one selected from an entrance, corridor, toilet, washroom, bathroom, changing room, veranda, balcony, attic, staircase, garage, warehouse, attic storage, pantry, library, closet, cupboard, living room, bedroom, and dining room.

[0061] The pests that can be controlled by the composition and pest control method of the present invention include various harmful insects and arthropods such as mites. Specifically, the pests that can be controlled include harmful flying insects such as Culex pipiens, Culex tritaeniorhynchus, Culex aeruginosa, and Culex pipiens; Aedes mosquitoes such as Aedes aegypti and Aedes albopictus; Anopheles mosquitoes such as Anopheles sinensis; midges; houseflies such as Muscicapa japonica, Muscicapa fuscipes, and Muscicapa japonica; blowflies, flesh flies, Drosophila, moth flies, phorid flies, horseflies, gnats, stable flies, and biting midges. Among these, mosquitoes such as Culex pipiens, Aedes mosquitoes, and Anopheles mosquitoes are particularly suitable as pests to be controlled. Furthermore, the composition of the present invention and the pest control method of the present invention are also effective against mosquitoes, flies, fleas, bed bugs, house dust mites, indoor dust mites, cockroaches, ticks, etc., which are classified as sanitary pests that transmit diseases and cause illness in humans, and these sanitary pests can also be listed as target pests for control. Another embodiment of the present invention is a method in which the above-mentioned pest control method is a method for exterminating sanitary pests. In this specification, "control" is a concept that includes extermination, repellent and prevention. "Extermination" is a concept that includes killing, knocking down, driving away or keeping away target pests, and it is preferable to kill or knock down the pests.

[0062] The present invention will be described in more detail below with reference to examples such as manufacturing examples and test examples, but the present invention is not limited to these examples.

[0063] Examples 1-3, Comparative Example 1 (Production of pest control mats) A pest control solution for pest control mats was prepared by mixing each component to the composition shown in Table 1. 0.75 mL of this solution was spread onto each blank mat material (made of pulp and cotton linter, 0.21 cm thick, 3.5 cm long side, 2.2 cm short side, mass 695 mg), yielding pest control mats containing 25 mg (Example 1), 50 mg (Example 2), and 100 mg (Example 3, Comparative Example 1) of natural pyrethrin per mat.

[0064] In the table, radical chain inhibitor 1 is represented as BHT; peroxide decomposer 1 as 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite) (JPH-1200 (manufactured by Johoku Chemical Industry)); and solvent 1 as isoparaffinic solvent (Isopar M (manufactured by ExxonMobil)).

[0065] Test Example 1 (Amount of Natural Pyrethrin Evaporation in Pest Control Mats) One pest control mat (Pest Control Mat 1) manufactured in Example 1 was heated on a ceramic heater at 150°C, and the amount of natural pyrethrin evaporated in one hour between 0 and 1 hour after the start of heating (V1) and the amount of natural pyrethrin evaporated in one hour between 11 and 12 hours of heating (V12) were analyzed. The amount of natural pyrethrin evaporated (mg / hour) was determined by collecting the vapor of volatilized natural pyrethrin in a urethane foam-packed column at predetermined intervals for a predetermined time, extracting it from the urethane foam with acetone, and quantitatively analyzing the amount of natural pyrethrin contained in the extract by high-performance liquid chromatography. The same procedure was performed for the pest control mats manufactured in Examples 2 and 3, and Comparative Example 1 (Pest Control Mat 2, Pest Control Mat 3, and Comparative Pest Control Mat 1). The results are shown in Table 2.

[0066] The pest control mats 1 to 3 of the present invention had a high ratio (V12 / V1) of the evaporation rate V12 (mg / hour) after 12 hours of heating to the evaporation rate V1 (mg / hour) after 1 hour of heating, confirming that the amount of natural pyrethrin transpiration was stably maintained over a long period of time. On the other hand, comparative pest control mat 1, which does not belong to the present invention, had a low ratio (V12 / V1) of the evaporation rate V12 (mg / hour) after 12 hours of heating to the evaporation rate V1 (mg / hour) after 1 hour of heating, confirming that the amount of natural pyrethrin transpiration decreased significantly over time.

[0067] Test Example 2 (Efficacy Test of Pest Control Mat) A heated vaporization insecticide device (heater temperature: 150°C) shown in Figure 1, with pest control mat 1 (heated for 12 hours) placed on the floor of a test chamber (3m x 4m x 2.3m), was immediately released into the chamber, and the number of knocked-down insects after 60 minutes was recorded. The knock-down rate (hereinafter referred to as the KD rate) can be calculated using the following formula. The same procedure was performed for pest control mat 2 and pest control mat 3. KD rate (%) = (Number of knocked-down insects / Number of test insects) x 100 The results are shown in Table 3.

[0068] The pest control mat according to the present invention was confirmed to exhibit a high level of pest control efficacy even after being heated for 12 hours. In other words, it was suggested that the pest control mat according to the present invention can maintain its excellent efficacy even after prolonged use (heating).

[0069] Test Example 3 (User Experience of Heat-Vaporized Insecticide) One or more heat-vaporized insecticide devices, as shown in Figure 1, with insecticide mats 2 set up to achieve a predetermined amount of natural pyrethrin vaporization, were installed on the floor of a test chamber (3m x 4m x 2.3m). The natural pyrethrin was vaporized by turning on the power (heating) for 10 minutes. After that, participants entered the chamber and evaluated the user experience by assigning scores based on the following criteria. The results are shown in Table 4. Criterion 1 (Odor) 3: Unpleasant 2: Sensitive but not unpleasant 1: Almost not noticeable 0: Not noticeable at all Criterion 2 (Sensations other than odor (e.g., scratchy throat, itchy or stinging nose)) 3: Unpleasant 2: Sensitive but not unpleasant 1: Almost not noticeable 0: Not noticeable at all Judgment: × (Poor usability): The sum of Criterion 1 and Criterion 2 is 5 or more △ (Issues with usability): The sum of Criterion 1 and Criterion 2 is 3 to 4 ○ (No problems with usability): The sum of Criterion 1 and Criterion 2 is 2 or less

[0070] It was confirmed that the user experience was good when the transpiration rate of natural pyrethrin was between 0.2 mg / hour and 2.0 mg / hour. On the other hand, it was confirmed that the user experience deteriorated when the transpiration rate of natural pyrethrin exceeded 2.0 mg / hour.

[0071] The present invention provides a pest control composition and a pest control method with excellent pest control effects.

[0072] 10 Hot plate 11 Pest control mat 12 Power switch 13 Casing

Claims

1. A pest control composition comprising natural pyrethrin, a radical chain inhibitor, a peroxide decomposer, and a solid carrier, wherein the ratio (V12 / V1) of the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 150°C for 12 hours to the natural pyrethrin evaporation rate V1 (mg / hour) after heating at 150°C for 1 hour is 0.2 to 1.

0.

2. The pest control composition according to claim 1, wherein the radical chain inhibitor comprises dibutylhydroxytoluene.

3. The pest control composition according to claim 1, wherein the peroxide decomposing agent comprises at least one selected from the group consisting of 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite), 2-tert-butyl-6-methyl-4-{3-[(2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosfepin-6-yl)oxy]propyl}phenol, tetra(C12-15 alkyl)-4,4'-isopropylidenediphenyl diphosphite, and tris(nonylphenyl)phosphite.

4. The pest control composition according to claim 1, wherein the peroxide decomposing agent comprises 4,4'-butylidenebis(3-methyl-6-t-butylphenyl ditridecyl phosphite).

5. The pest control composition according to claim 1, wherein the mass ratio of the radical chain inhibitor to the peroxide decomposing agent is 1:0.078 to 1:

100.

6. A pest control mat, comprising the pest control composition according to any one of claims 1 to 5.

7. A method for controlling pests, comprising the step of evaporating natural pyrethrin into the air for 12 hours at a evaporation rate ranging from 0.2 mg / hour to 2.0 mg / hour.

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