Pest control composition

Abstract

To provide a pest control agent capable of achieving control of agricultural and horticultural pests at a low concentration due to an ingredient which maintains safety for humans, further to provide a pest control agent which has a danger of harmful effects such as damaged appearance reduced to the utmost even when used on crops such as fruit trees, ornamental flowers and the like where appearance is important, and especially to provide a pest control agent which has a sufficient control effect against spider mites which are important pests in agriculture by low concentration spray.SOLUTION: Provided is a pest control composition, comprising: (a) a polyglycerol fatty acid ester containing at least one selected from esters where the polymerization number of glycerol is 3-10, the degree of esterification is 50% or more, and the constituent fatty acid has a carbon chain length of 12-22; and (b) a nonionic surfactant which is a fatty acid ester where the hydrophilic group contains a polyol structure.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a pest control composition. Specifically, it relates to a spraying composition for agricultural and horticultural crops that contains polyglycerol fatty acid ester with high safety as an active ingredient and a nonionic surfactant as an additive.

Background Art

[0002] In order to stably supply agricultural and horticultural crops, the control of pests and diseases is essential. Currently, chemical synthetic pesticides are widely used for controlling these pests and diseases because of their excellent economy and control effects. However, if chemical synthetic pesticides are continuously used, the target pests and diseases may develop drug resistance. In recent years, consumers' awareness of pesticides has increased, and there is a demand for pesticides with high safety for the human body and the environment. Although the control of pests and diseases by biological pesticides such as natural enemies and physical control using films, etc. has been confirmed to be effective in some cases, the current cost-effectiveness is not satisfactory.

[0003] Under such circumstances, pest control compositions that act physically, different from chemical synthetic pesticides, have been reported. For example, as active ingredients, a pest control composition using a water-soluble polymer in Patent Document 1, a medium-chain fatty acid triglyceride having 8 to 10 carbon atoms in Patent Document 2, and a sorbitan fatty acid ester in Patent Document 3 are each described. However, in order for these described compositions to exhibit sufficient effects, a high concentration of the active ingredient is required, and there are concerns about the adverse effects on crops caused thereby (hereinafter referred to as "phytotoxicity" in this specification), so the applicable crops are limited.

[0004] In recent years, improved compositions for addressing these issues have been reported. Patent Document 4 discloses a pest control composition containing a polyglycerol fatty acid ester with an HLB of 5 or less and being liquid at room temperature, and a nonionic surfactant, and it is described that high control effects are exhibited even in a highly diluted solution at 1000-fold dilution against spider mites and aphids. Further, Patent Document 5 discloses a control agent for plant pests and / or plant diseases containing a polyglycerol fatty acid ester as an active ingredient, wherein the polyglycerol fatty acid ester is an ester of at least one fatty acid selected from fatty acids having 8 to 10 carbon atoms and at least one polyglycerol polymerized from 3 to 10 glycerols, and it is described that the control agent exhibits uniformly high control effects against a wide range of pests such as mites, thrips, aphids, whiteflies, gray mold, powdery mildew, etc. by diluting the described composition 500-fold with water and using it. Thus, it has been shown that by using various polyglycerol fatty acid esters, it is possible to control pests at a relatively low spraying solution concentration and the risk of phytotoxicity can be kept low. However, even with these agents, the risk of phytotoxicity has not been eliminated for some crops such as flowers.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made in view of the problems in the prior art, and it is to provide a pest control agent that can achieve pest control at a low concentration with components that ensure safety for humans, and further, to provide a pest control agent that minimizes the risk of phytotoxicity that may damage the appearance even when used on crops such as fruit trees and flowers where appearance is important. In particular, it is to provide a pest control agent that has sufficient control efficacy at a low concentration against spider mites, which are important pests in agriculture.

Means for Solving the Problems

[0007] As a result of intensive research to solve the above problems, the present inventors focused on polyglycerol fatty acid esters, which are known to be safe for the human body and the environment as food additives, and by combining fatty acid ester-based nonionic surfactants, the adhesion selectivity of the active ingredient, polyglycerol fatty acid esters, to target pests was improved, and while suppressing the risk of phytotoxicity to plants, it was found that a high control effect can be obtained at a low concentration against pests, leading to the completion of the present invention.

[0008] That is, the present invention relates to an invention having the following configurations (1) to (11). (1) A pest control composition containing (a) polyglycerol fatty acid ester and (b) a nonionic surfactant, (a) The polyglycerol fatty acid ester has a degree of polymerization of glycerol of 3 to 10, an esterification rate of 50% or more, and the carbon chain length of the constituent fatty acid is 12 to 22, (b) The nonionic surfactant is one fatty acid ester selected from the group consisting of glycerol fatty acid ester, polyoxyalkylenated glycerol fatty acid ester, polyoxyethylenated castor oil, polyglycerol fatty acid ester, sorbitan fatty acid ester, polyoxyalkylenated sorbitan fatty acid ester, polyoxyalkylenated sorbit fatty acid ester, and sucrose fatty acid ester, a pest control agent. (2)(a) The pest control composition according to (1), wherein the fatty acid constituting the polyglycerin fatty acid ester contains at least one selected from the group consisting of lauric acid, oleic acid, and erucic acid. (3)(b) The pest control composition according to (1) or (2), wherein the nonionic surfactant contains at least one selected from the group consisting of polyoxyethylenated glycerin fatty acid ester, polyoxyethylenated castor oil, polyglycerin fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and polyoxyethylene sorbit fatty acid ester. (4)(b) The pest control composition according to any one of (1) to (3), wherein the fatty acid constituting the nonionic surfactant contains at least one selected from the group consisting of caprylic acid, lauric acid, oleic acid, isostearic acid, and ricinoleic acid. (5)(b) The pest control composition according to any one of (1) to (4), wherein the HLB of the nonionic surfactant is 5 to 17. (6)(b) The pest control composition according to any one of claims 1 to 5, wherein the component content mass of the nonionic surfactant in the composition is less than that of (a) polyglycerin fatty acid ester. (7) The pest control composition according to any one of (1) to (6), which does not contain a pesticidal active ingredient selected from fungicides, insecticides, acaricides, herbicides, and plant growth regulators. (8) The pest control composition according to any one of (1) to (7), wherein the pest is one or more organisms belonging to an animal order selected from the orders Hemiptera, Acarina, and Thysanoptera. (9) A spray liquid obtained by diluting the pest control composition according to any one of (1) to (8) with water. (10) A spray liquid obtained by including another pesticide in the spray liquid according to (9). (11) A method for controlling pests, characterized in that the spray liquid according to (9) or (10) is directly sprayed on the pests or the crops where the pests occur.

Advantages of the Invention

[0009] The pest control composition of the present invention exhibits an excellent control effect against pests on agricultural and horticultural crops, particularly against mites. In addition, the polyglycerol fatty acid ester, which is the active ingredient, becomes fatty acids and polyhydric alcohols with low toxicity upon decomposition, so it has a low environmental impact and high safety. Therefore, many of these components have a track record of use as food additives, and the safety for the human body is guaranteed. The safety of the pesticide composition of the present invention is extremely high. Since the pest control composition of the present invention can control pests at a component concentration equal to or lower than that of known compositions, it is advantageous in terms of drug cost. In addition, since the component concentration is low, the risk of phytotoxicity to crops can be reduced.

Mode for Carrying Out the Invention

[0010] The harmful control composition of the present invention is a pest control composition containing (a) polyglycerol fatty acid ester and (b) a nonionic surfactant (hereinafter also referred to as "the pest control composition of the present invention" or "the composition of the present invention" in this specification). It has been completed based on the finding that, compared with conventional pest control agents that act physically, it shows an excellent control effect against pests while reducing the risk of phytotoxicity to plants. In this specification, "pest control" directly acts on pests belonging to animal orders such as Hemiptera, Acarina, and Thysanoptera and causative bacteria of plant diseases. For example, by covering or partially adhering the drug to the pests to prevent their activities, or by blocking the spiracles of the pests, etc., physically weaken or kill these pests and control them.

[0011] (a) The polyglycerol fatty acid ester means a compound in which glycerol is polymerized two or more times to form polyglycerol, and part or all of the hydroxy groups contained in the polyglycerol are ester-bonded to fatty acids. The "degree of polymerization" shown below indicates the average degree of polymerization of glycerol in the polyglycerol. The polyglycerol fatty acid ester used in the present invention is a polyglycerol fatty acid ester obtained by ester-bonding polyglycerol having a degree of polymerization of 3 to 10 and a fatty acid. Examples of polyglycerol having a degree of polymerization of 3 to 10 include triglycerol, tetraglycerol, pentaglycerol, hexaglycerol, heptaglycerol, octaglycerol, nonaglycerol, and decaglycerol. More preferably, it is composed of polyglycerol having a degree of polymerization of 6 to 10. The decaglycerol fatty acid ester having a degree of polymerization of 10 is particularly preferred.

[0012] (a) The polyglycerol fatty acid ester is one in which a fatty acid having a carbon chain length of 12 to 22 is ester-bonded. Examples of such fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, ricinoleic acid, linoleic acid, erucic acid, and the like. Among them, from the viewpoint of the pest control effect, it preferably contains at least one selected from lauric acid, oleic acid, and erucic acid, and more preferably contains oleic acid.

[0013] (a) The "esterification rate" of the polyglycerol fatty acid ester is an index indicating what percentage of the total hydroxy groups (number) contained in the polyglycerol constituting the polyglycerol fatty acid ester are ester-bonded to the carboxy groups of fatty acids on average. The polyglycerol fatty acid ester contained in the present invention preferably has an esterification rate of 50% or more, and more preferably 60 to 90%.

[0014] (a) As the polyglycerol fatty acid ester, it is a polyglycerol fatty acid ester with an esterification rate of 50% or more, composed of polyglycerol with a polymerization degree of 3 to 10 and a fatty acid with a carbon chain length of 12 to 22. More preferably, it is a polyglycerol fatty acid ester with an esterification rate of 60 to 90%, composed of polyglycerol with a polymerization degree of 4 to 10 and a fatty acid with a carbon chain length of 12 to 22. In this case, the constituent fatty acid is preferably at least one selected from the group consisting of lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, ricinoleic acid, linoleic acid, and erucic acid. Particularly preferably, it is a polyglycerol fatty acid ester with an esterification rate of 60 to 90%, composed of polyglycerol with a polymerization degree of 6 to 10 and at least one selected from the group consisting of lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, oleic acid, ricinoleic acid, linoleic acid, and erucic acid as a constituent component. In this case, a decaglycerol fatty acid ester with a polymerization degree of 10 is even more preferably used. Examples thereof include the following. Tetraglycerol pentaoleate, hexaglycerol pentaoleate, decaglycerol decaoleate, decaglycerol octaerucate, decaglycerol octalaurate, polyglycerol ricinoleate, etc. From the viewpoints of the pest control effect and the risk of phytotoxicity to plants, among these, particularly, decaglycerol decaoleate is preferred. The polyglycerol fatty acid ester is commercially available under the name SY Glister (trade name, manufactured by Sakamoto Yakuhin Kogyo Co., Ltd.).

[0015] (b) When the nonionic surfactant is used by diluting the composition of the present invention with water, it can be easily suspended. Also, due to the physicochemical properties obtained by combining with the above polyglycerol fatty acid ester, it is used to improve the wetting property and adhesiveness to the target plant, pest, or causative bacterium of plant diseases, and to obtain a high control effect. Examples of the nonionic surfactant in the composition of the present invention include at least one selected from the group consisting of glycerol fatty acid ester, polyoxyethylenated glycerol fatty acid ester, polyoxyethylenated castor oil, polyglycerol fatty acid ester, sorbitan fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, polyoxyethylene sorbit fatty acid ester, and sucrose fatty acid ester. Preferably, it is at least one selected from the group consisting of glycerol fatty acid ester, polyoxyethylenated glycerol fatty acid chain ester, polyoxyethylenated castor oil, polyglycerol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and polyoxyethylene sorbit fatty acid ester. More preferably, it is at least one selected from the group consisting of polyoxyethylenated glycerol fatty acid chain ester, polyoxyethylenated castor oil, polyglycerol fatty acid ester, and polyoxyethylene sorbitan fatty acid ester. (b) The hydrophobic group of the nonionic surfactant is a fatty acid. Although the carbon chain length thereof is not limited, from the viewpoints of the pest control effect and the risk of phytotoxicity to plants, as the fatty acid, it preferably contains at least one selected from the group consisting of caprylic acid, lauric acid, oleic acid, isostearic acid, and ricinoleic acid.

[0016] HLB (Hydrophile-Lipophile Balance) represents the degree of hydrophilicity and lipophilicity of a surfactant and is an index expressed by a numerical value from 0 to 20. A low HLB indicates a surfactant with high lipophilicity, and a high HLB indicates a surfactant with high hydrophilicity. Therefore, surfactants with a low HLB are more compatible with hydrophobic systems, and surfactants with a high HLB are more compatible with hydrophilic systems. In other words, it can be said that it is an index indicating which system a surfactant is more likely to dissolve into in a water / oil system. The HLB value of the polyglycerol fatty acid ester is obtained by applying the numerical value derived from the following calculation method, which is Griffin's empirical formula. In addition, the following saponification value and acid value use the values analyzed in accordance with the general test methods for food additives and raw material specifications for quasi-drugs. HLB value = 20(1 - S / A) S: Saponification value of the ester of the surfactant, A: Acid value of the fatty acid constituting the surfactant

[0017] The (b) nonionic surfactant used in the present invention preferably includes those with an HLB of 5 to 17. In the pest control agent of the present invention, from the viewpoints of emulsifying property during use, pest control effect, and risk of phytotoxicity to plants, it preferably includes those with an HLB of 7 to 16, and more preferably includes those with an HLB of 8 to 12.

[0018] The pest control composition of the present invention contains (a) polyglycerol fatty acid ester and (b) nonionic surfactant in an arbitrary ratio. However, if there is too much (b) nonionic surfactant, the pest control effect may decrease and the risk of phytotoxicity to plants may increase. Therefore, the content of (b) nonionic surfactant is preferably less than that of (a) polyglycerol fatty acid ester. Also, if the proportion of (a) polyglycerol fatty acid ester, which is the active ingredient, is too high, the emulsifiability when diluted with water will be poor, unevenness will occur in the spraying solution, and the pest control effect may become unstable. Therefore, more preferably, the mass ratio of (a) polyglycerol fatty acid ester:(b) nonionic surfactant = 1:0.01 to 1:0.9, even more preferably (a) polyglycerol fatty acid ester:(b) nonionic surfactant = 1:0.05 to 1:0.5, and particularly preferably (a) polyglycerol fatty acid ester:(b) nonionic surfactant = 1:0.1 to 1:0.3. Also, in the pest control composition of the present invention, usually, (a) polyglycerol fatty acid ester is contained in an amount of 5 to 100% by mass. Also, (b) nonionic surfactant is contained in an amount of 0.1 to 50% by mass. Preferably, (a) polyglycerol fatty acid ester is contained in an amount of 20 to 95% by mass, and (b) nonionic surfactant is contained in an amount of 1 to 30% by mass.

[0019] The pest control composition in the present invention is suitable for use alone as a pest control composition, but it can also be used in combination with any pesticide or contain additive components within the range where the excellent physical properties of the present invention are not lost. For example, examples of the additive components include various pesticidal active ingredients such as insecticides, fungicides, insecticidal fungicides, herbicides, and plant growth regulators. However, since the present invention has a high control effect on pests by a physical action and is characterized by a low risk of phytotoxicity to plants, it is preferable that the polyglycerol fatty acid ester is used as the active ingredient for pest control and does not contain other pesticidal active ingredients.

[0020] As other additive components in the present invention, there are surfactants for the purpose of improving the emulsifiability when the pest control composition is diluted with water, and they are not particularly limited. However, other surfactants may greatly change the physical properties in the present invention, and there is a risk of increasing the possibility of phytotoxicity to plants. Therefore, it is preferable that the anionic, cationic, and amphoteric surfactants are not contained in an amount more than the total mass of (a) polyglycerol fatty acid ester and (b) nonionic surfactant. Further, it is more preferable that the nonionic surfactant not containing a fatty acid ester structure is not contained in an amount more than the total mass of the polyglycerol fatty acid ester and the nonionic surfactant. The content of the above other surfactants is usually 0 to 30% by mass based on the total amount of the composition of the present invention. Preferably it is 0 to 10% by mass, and more preferably 0 to 5% by mass.

[0021] As additive components of the pest control composition in the present invention, there are various solvents such as animal and vegetable oils, mineral oils, paraffin, water, (poly)ethylene glycol, (poly)propylene glycol, alcohols, ethers, ketones, fatty acids, fatty acid esters, and fatty acid amides for adjusting the appearance of the composition. In particular, since the composition of the present invention is usually used in a diluted state with water, water can be used in any proportion. Further, as hydrophilic solvents, (poly)ethylene glycol, (poly)propylene glycol, methanol, and isopropanol are preferable, and as hydrophobic solvents, fatty acid esters and fatty acid amides are preferable. It is also possible to use the pest control composition of the present invention as a solid preparation by impregnating, adsorbing, or retaining an oily component on a solid carrier of a mineral or an organic substance such as silica gel, clay, silt, bentonite, lactose, cyclodextrin. The total content of the above-mentioned solvent or solid carrier excluding water is usually 0 to 90% by mass, preferably 0 to 50% by mass, more preferably 0 to 30% by mass based on the total amount of the composition of the present invention. As other optional additive components, defoaming components, foam-suppressing components, coloring components, fragrance components, etc. can be mentioned, and these are not limited as long as they are components generally used in pesticides and the like. The content of these optional additive components is usually 0 to 30% by mass based on the total amount of the composition of the present invention.

[0022] The pest control composition of the present invention is used for controlling pests occurring in agricultural crops such as fruit trees, tea trees, vegetables and flowers. Examples of pests targeted by the pest control composition of the present invention include mites and insects that belong to animal orders such as Acarina, Hemiptera, Lepidoptera and Thysanoptera and damage agricultural crops, and it has an excellent control effect especially against spider mites. Examples of organisms belonging to the order Acarina include spider mites, rust mites and dust mites. Examples of spider mites include Tetranychus urticae, Tetranychus kanzawai, Panonychus citri and Panonychus ulmi, examples of rust mites include Phyllocoptruta oleivora and Eriophyes chibaensis, and examples of dust mites include Dermatophagoides farinae. Examples of organisms belonging to the order Hemiptera include aphids, whiteflies and stink bugs. Examples of aphids include Aphis gossypii and Myzus persicae, examples of whiteflies include Bemisia tabaci and Trialeurodes vaporariorum, and examples of stink bugs include Halyomorpha halys. Examples of organisms belonging to the order Thysanoptera include Toxoptera citricida, Thrips palmi, Thrips tabaci, Thrips hawaiiensis and Thrips flavus. Examples of organisms belonging to the order Lepidoptera include Plutella xylostella and Helicoverpa armigera. In addition, the composition of the present invention is also effective in controlling diseases caused by fungi such as powdery mildew occurring in vegetables, flowers and fruit trees.

[0023] The composition of the present invention is usually used as a pesticide formulation that is diluted with water to form a spraying solution during spraying. By spraying a sufficient amount of the spraying solution (hereinafter referred to as the spraying solution of the present invention) onto the leaf surface of a plant infested with pests, pests in agricultural and horticultural crops can be controlled. The concentration of the polyglycerol fatty acid ester in the spraying solution of the present invention is usually 50 to 5000 ppm, preferably about 100 to 2000 ppm. The spraying solution can be obtained by diluting and adjusting the composition of the present invention with water so that the concentration of the fatty acid ester in the spraying solution is within the above range. Specifically, the method for preparing the spraying solution of the present invention and the method for controlling pests will be described below. By adding 100 to 10000 parts by mass of water to 1 part by mass of the composition of the present invention and stirring well to obtain a uniform mixture, a spraying solution can be obtained. According to a conventional method, the spraying solution is sprayed in a sufficient amount onto pests or crops where pests have occurred using a hand sprayer, a knapsack sprayer, a power sprayer, a boom sprayer, a speed sprayer, etc., so that the pests can be controlled. The pest control composition of the present invention controls pests by the direct action of the active ingredient on the pests. Although the composition of the present invention is a formulation having a physical control effect, as described above, even as a spraying solution containing the polyglycerol fatty acid ester as the active ingredient at a low concentration, a high pest control effect can be achieved.

Examples

[0024] Hereinafter, the present invention will be described more specifically by way of examples.

[0025] Example 1 83 parts by mass of decaglycerol decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of polyoxyethylene (20) sorbitan trioleate (Takemoto Yushi Co., Ltd.; trade name New Calgen D-945E, HLB: 11.0) were mixed to obtain a pest control composition.

[0026] Example 2 83 parts by mass of decaglycerin decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of polyoxyethylene (30) sorbitol tetraoleate (Kao Corporation; trade name Leodol 440V, HLB: 11.8) were mixed to obtain a pest control composition.

[0027] Example 3 83 parts by mass of decaglycerin decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of polyoxyethylenated castor oil (Takemoto Yushi Co., Ltd.; trade name New Calgen D-206, HLB: 5.1) were mixed to obtain a pest control composition.

[0028] Example 4 83 parts by mass of decaglycerin decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of diglycerin monocaprylate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister MCA-150, HLB: 8.7) were mixed to obtain a pest control composition.

[0029] Example 5 83 parts by mass of decaglycerin decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of tetraglycerin monolaurate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister ML-310, HLB: 10.4) were mixed to obtain a pest control composition.

[0030] Example 6 80 parts by mass of decaglycerin decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 20 parts by mass of tetraglycerin monoisostearate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name S Face IS-401P, HLB: 8.2) were mixed to obtain a pest control composition.

[0031] Example 7 83 parts by mass of tetraglycerin pentaoleate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY-Glycer PO-3S, esterification rate 83%) and 17 parts by mass of polyoxyethylene (20) sorbitan trioleate (Takemoto Yushi Co., Ltd.; trade name New Calgen D-945E, HLB: 11.0) were mixed to obtain a pest control composition.

[0032] Example 8 90 parts by mass of decaglycerin octaelcic acid ester (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY-Glycer EO-750, esterification rate 67%) and 10 parts by mass of tetraglycerin monoisostearate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name S-Face IS-401P, HLB: 8.2) were mixed to obtain a pest control composition.

[0033] Example 9 80 parts by mass of decaglycerin octalauric acid ester (esterification rate 67%) and 20 parts by mass of tetraglycerin monoisostearate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name S-Face IS-401P, HLB: 8.2) were mixed to obtain a pest control composition.

[0034] Example 10 95 parts by mass of decaglycerin decao leate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY-Glycer DAO-7S, esterification rate 83%) and 5 parts by mass of polyoxyethylene (20) sorbitan trioleate (Takemoto Yushi Co., Ltd.; trade name New Calgen D-945E, HLB: 11.0) were mixed to obtain a pest control composition.

[0035] Example 11 50 parts by mass of decaglycerin decao leate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY-Glycer DAO-7S, esterification rate 83%) and 50 parts by mass of polyoxyethylene (20) sorbitan trioleate (Takemoto Yushi Co., Ltd.; trade name New Calgen D-945E, HLB: 11.0) were mixed to obtain a pest control composition.

[0036] Example 12 90 parts by mass of decaglycerin decaoleate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%), 5 parts by mass of diglycerin monocaprylate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister MCA-150, HLB: 8.7), and 5 parts by mass of polyoxyethylene oleate (NOF Corporation; trade name Nonion O-6) were mixed to obtain a pest control composition.

[0037] Example 13 60 parts by mass of decaglycerin decaoleate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%), 20 parts by mass of diglycerin monocaprylate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister MCA-150, HLB: 8.7), and 20 parts by mass of methyl laurate (Kao Corporation; trade name Exceparl ML-85) were mixed to obtain a pest control composition.

[0038] Example 14 90 parts by mass of decaglycerin decaoleate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%), 5 parts by mass of diglycerin monocaprylate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister MCA-150, HLB: 8.7), and 5 parts by mass of polyoxyethylene sorbitan laurate (Takemoto Yushi Co., Ltd.; trade name New Calgen D-941) were mixed to obtain a pest control composition.

[0039] Comparative Example 1 83 parts by mass of decaglycerin decaoleate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of polyether-modified organopolysiloxane (Shin-Etsu Chemical Co., Ltd.; trade name KF-640, HLB: 13.5) were mixed to obtain a pest control composition.

[0040] Comparative Example 2 83 parts by mass of decaglycerin decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of polyoxyethylene oleyl ether (Kao Corporation; trade name Emulgen 408, HLB: 10.0) were mixed to obtain a pest control composition.

[0041] Comparative Example 3 83 parts by mass of decaglycerin decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of polyoxyethylene oleate (NOF Corporation; trade name Nonion O-4, HLB: 11.7) were mixed to obtain a pest control composition.

[0042] Comparative Example 4 83 parts by mass of decaglycerin decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of polyoxyethylene oleate (Toho Chemical Industry Co., Ltd.; trade name Pegnol O-24, HLB: 7.9) were mixed to obtain a pest control composition.

[0043] Comparative Example 5 83 parts by mass of decaglycerin decaoleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister DAO-7S, esterification rate 83%) and 17 parts by mass of polyoxyethylene laurylamine (Takemoto Yushi Co., Ltd.; trade name New Calgen D-3102, HLB: 6.2) were mixed to obtain a pest control composition.

[0044] Comparative Example 6 83 parts by mass of propylene glycol monolaurate (Riken Vitamin Co., Ltd.; trade name Type-BP, esterification rate 50%) and 17 parts by mass of polyoxyethylene (20) sorbitan trioleate (Takemoto Yushi Co., Ltd.; trade name New Calgen D-945E, HLB: 11.0) were mixed to obtain a pest control composition.

[0045] Comparative Example 7 83 parts by mass of sorbitan monolaurate (Takemoto Yushi Co., Ltd.; trade name: New Calgen D-931, esterification rate 25%) and 17 parts by mass of polyoxyethylene (20) sorbitan trioleate (Takemoto Yushi Co., Ltd.; trade name: New Calgen D-945E, HLB: 11.0) were mixed to obtain a pest control composition.

[0046] Comparative Example 8 83 parts by mass of decaglycerin monooleate (Sakamoto Yakuhin Kogyo Co., Ltd.; trade name: SY Glister MO-7S, esterification rate 8%) and 17 parts by mass of polyoxyethylene (20) sorbitan trioleate (Takemoto Yushi Co., Ltd.; trade name: New Calgen D-945E, HLB: 11.0) were mixed to obtain a pest control composition.

[0047] Test Example 1: Control Test of Tetranychus urticae On kidney bean seedlings at the first trifoliate leaf extraction stage parasitized by Tetranychus urticae at various growth stages, a sufficient amount of a pest control agent diluted 1000-fold with water was sprayed using an electric sprayer and managed in a constant temperature room at 25°C. Six days after the treatment, the number of insects living on each leaf was counted. The corrected density index when using the compositions of each example and comparative example was determined by the following calculation formula, and the results are summarized in Table 2. Corrected density index = (number of insects after treatment in the treated plot / number of insects before treatment in the treated plot) × (number of insects before treatment in the non-treated plot / number of insects after treatment in the non-treated plot) × 100

[0048] Test Example 2: Phytotoxicity Test (Kidney Bean Leaves) On kidney bean seedlings at the first trifoliate leaf extraction stage, a sufficient amount of a pest control agent diluted 100-fold with water was sprayed using an electric sprayer and managed in a constant temperature room at 25°C. Three days after the treatment, the phytotoxicity evaluation when using the compositions of each example and comparative example was carried out according to the criteria in Table 1, and the results are summarized in Table 2.

[0049] Test Example 3: Phytotoxicity Test (Eggplant Flowers) A sufficient amount of a pest control agent diluted 100-fold with water was sprayed onto the blooming eggplant flowers using an electric sprayer and managed in a vinyl house. One day after the treatment, the phytotoxicity of each composition of the examples and comparative examples was evaluated based on the criteria in Table 1, and the results were summarized in Table 2.

[0050] Table 1 Phytotoxicity evaluation criteria TIFF2025107490000001.tif32102

[0051] Table 2 List of test results TIFF2025107490000002.tif138125

[0052] As shown by the results of Test Examples 1 to 3, despite the high concentration of 100-fold dilution, no severe phytotoxic symptoms were observed on the green bean leaves and eggplant flowers for the pest control composition of the present invention. Even at a low concentration of 1000-fold dilution, it was confirmed to have a sufficiently high control effect against spider mites. On the other hand, the compositions of the comparative examples had a high control effect, but there were those with phytotoxic symptoms observed, those without phytotoxic symptoms but with a low control effect, or those with phytotoxic symptoms observed and a low control effect. The details of these test results are described below. In Examples 1 to 6 and Comparative Examples 1 to 5, compositions using various nonionic surfactants were tested. All of the compositions of the present invention exhibited a high control effect, and no phytotoxicity symptoms were observed. In particular, the nonionic surfactant is preferably polyoxyethylene sorbitan fatty acid ester or polyglycerol fatty acid ester, or polyoxyethylenated castor oil. In Examples 7 to 9 and Comparative Examples 6 to 8, compositions using various polyglycerol fatty acid esters or other fatty acid esters were tested. All of the compositions of the present invention exhibited a high control effect, and no phytotoxicity symptoms were observed or were minor. From these results, it was confirmed that the polyglycerol fatty acid ester used in the present invention greatly affects the effects of the present invention. The fatty acid constituting it is preferably oleic acid, and the polyglycerol fatty acid ester is particularly preferably decaglycerol decaoleate. Examples 10 and 11 are compositions in which the contents of polyglycerol fatty acid ester and nonionic surfactant are changed. All of them exhibited a high control effect, and no phytotoxicity symptoms were observed or were minor. However, since the risk of phytotoxicity increases as the content of the nonionic surfactant increases, the mass of the component content of the nonionic surfactant in the composition is preferably less than that of the polyglycerol fatty acid ester. Examples 12 to 14 are those in which a surfactant or a solvent is added to the composition of the present invention. Thus, when the addition amount is small with respect to the composition of the present invention and does not greatly affect the physical properties, quality improvement as a formulation such as adjustment of appearance and viscosity, improvement of emulsifying property, and sufficient control effect can be obtained, and at the same time, the risk of phytotoxicity to plants can be kept low.

Industrial Applicability

[0053] The pesticide composition according to the present invention has an action of killing pests by spraying a spraying liquid prepared by diluting it with water onto crops. Therefore, the pesticide composition of the present invention is used for the purpose of controlling pests in agricultural and horticultural plants. The pesticide composition according to the present invention uses polyglycerol fatty acid ester with guaranteed safety to the human body as an active ingredient and exhibits sufficient pest control effect in application at a low concentration. Furthermore, the pesticide composition of the present invention can be used as a pesticide for controlling agricultural and horticultural pests that minimizes the risk of phytotoxicity that may damage the appearance even when used on crops such as fruit trees and flowers where appearance is important.

Claims

1. A pest control composition containing (a) polyglycerol fatty acid ester and (b) a nonionic surfactant, wherein (a) the polyglycerol fatty acid ester has a degree of polymerization of glycerin of 3 to 10, an esterification rate of 50% or more, and the carbon chain length of the constituent fatty acids is 12 to 22, and (b) the nonionic surfactant is one fatty acid ester selected from the group consisting of glycerin fatty acid ester, polyoxyalkyleneated glycerin fatty acid ester, polyoxyethylenated castor oil, polyglycerol fatty acid ester, sorbitan fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene sorbit fatty acid ester, and sucrose fatty acid ester, a pest control agent.

2. The pest control composition according to claim 1, wherein (a) the fatty acid constituting the polyglycerol fatty acid ester contains at least one selected from the group consisting of lauric acid, oleic acid, and erucic acid.

3. The pest control composition according to claim 1 or 2, wherein (b) the nonionic surfactant contains at least one selected from the group consisting of polyoxyethylenated glycerin fatty acid ester, polyoxyethylenated castor oil, polyglycerol fatty acid ester, polyoxyethylene sorbitan fatty acid ester, and polyoxyethylene sorbit fatty acid ester.

4. The pest control composition according to any one of claims 1 to 3, wherein (b) the fatty acid constituting the nonionic surfactant contains at least one selected from the group consisting of caprylic acid, lauric acid, oleic acid, isostearic acid, and ricinoleic acid.

5. The pest control composition according to any one of claims 1 to 4, wherein (b) the HLB of the nonionic surfactant is 5 to 17.

6. The pest control composition according to any one of claims 1 to 5, wherein the component content mass of (b) the nonionic surfactant in the composition is less than that of (a) the polyglycerol fatty acid ester.

7. The pest control composition according to any one of claims 1 to 6, which does not contain an agricultural pesticide active ingredient selected from fungicides, insecticides, acaricides, herbicides, and plant growth regulators.

8. The pest control composition according to any one of claims 1 to 7, wherein the pest is one or more organisms belonging to an animal order selected from the orders Hemiptera, Acarina, and Thysanoptera.

9. A spraying solution obtained by diluting the pest control composition according to any one of claims 1 to 8 with water.

10. A spraying solution obtained by including other pesticides in the spraying solution according to claim 9.

11. A method for controlling pests, characterized by directly spraying the spraying solution according to claim 9 or 10 on pests or crops where pests occur.

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