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, which has a highly safe polyglycerin fatty acid ester as an active ingredient and contains 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 economic efficiency and control effect. However, if chemical synthetic pesticides are continuously used, target pests and diseases may develop drug resistance. In recent years, consumers' awareness of pesticides has increased, and there is a demand for pesticides that are highly safe 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 has been confirmed to be effective in some cases, the current cost-effectiveness is not satisfactory.

[0003] Under such circumstances, pest control compositions based on physical actions, 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 described respectively. 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, compositions improved for these problems have been reported. Patent Document 4 discloses a pest control composition containing a polyglycerol fatty acid ester having an HLB of 5 or less and being liquid at normal temperature, and a nonionic surfactant, and it is described that the composition exhibits a high control effect even in a highly diluted solution of 1000-fold dilution against 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 obtained by polymerizing 3 to 10 glycerols, and it is described that the control agent exhibits a uniformly high control effect 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 suppressed low. However, in these agents as well, 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 ensuring 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 having 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 a fatty acid ester-based nonionic surfactant, the adhesion selectivity of the active ingredient, polyglycerol fatty acid ester, 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 glycerol polymerization number 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, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene 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 kinds of organisms belonging to an animal order selected from the orders Hemiptera, Acarina, and Thysanoptera. (9) A spraying liquid obtained by diluting the pest control composition according to any one of (1) to (8) with water. (10) A spraying liquid obtained by including another pesticide in the spraying liquid according to (9). (11) A method for controlling pests, characterized by directly spraying the spraying liquid according to (9) or (10) onto the pests or the crops on which 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 polyglycerin fatty acid ester, which is an active ingredient, becomes a fatty acid and a polyhydric alcohol 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, and 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 pest control composition of the present invention is a pest control composition containing (a) a polyglycerin 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 it shows an excellent control effect against pests while reducing the risk of phytotoxicity to plants as compared with conventional pest control agents having a physical action. 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, when a drug coats or partially adheres to a pest, its activity is hindered, or the pest's spiracles are blocked, etc., physically weakening or killing these pests and controlling 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, etc. 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 number of hydroxy groups (number) contained in the polyglycerol constituting the polyglycerol fatty acid ester are ester-bonded to the carboxy group of the fatty acid 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, having polyglycerol with a polymerization degree of 3 to 10 and fatty acids with a carbon chain length of 12 to 22 as constituent components. More preferably, it is a polyglycerol fatty acid ester with an esterification rate of 60 to 90%, having polyglycerol with a polymerization degree of 4 to 10 and fatty acids with a carbon chain length of 12 to 22 as constituent components. 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%, having 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 constituent components and polyglycerol with a polymerization degree of 6 to 10. In this case, it is even more preferably decaglycerol fatty acid ester with a polymerization degree of 10. 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, decaglycerol decaoleate is particularly preferable. 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 and adhesion properties to the target plant, pest, or causative bacterium of plant diseases and obtain a high control effect. The nonionic surfactant in the composition of the present invention includes one or more 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, and its carbon chain length is not limited. However, from the viewpoints of the pest control effect and the risk of phytotoxicity to plants, the fatty acid 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 numerical values ranging from 0 to 20. A low HLB indicates a surfactant with high lipophilicity, while a high HLB indicates a surfactant with high hydrophilicity. Therefore, surfactants with low HLB are more compatible with hydrophobic systems, and surfactants with high HLB are more compatible with hydrophilic systems. In other words, it can be said that it is an index indicating which system the surfactant is more likely to dissolve into for 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 quasi-drug raw material specifications. 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 properties during use, pest control effect, and the 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, when 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 content 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 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 such additive components include various pesticide active ingredients such as insecticides, fungicides, insecticide-fungicides, herbicides, and plant growth regulators. However, since the present invention is characterized by having a high control effect on pests by a physical action and having 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 pesticide active ingredients.

[0020] As other additive components in the present invention, surfactants for the purpose of improving emulsifiability when the pest control composition is diluted with water may be mentioned, and are not particularly limited. However, other surfactants may significantly 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 total content mass of anionic, cationic, and amphoteric surfactants does not exceed the total content mass of (a) polyglycerol fatty acid ester and (b) nonionic surfactant. Furthermore, it is more preferable that a nonionic surfactant not containing a fatty acid ester structure does not exceed the total content 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, 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 may be mentioned. 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 the oily component on a solid carrier of a mineral or an organic substance such as silica gel, clay, silt, bentonite, lactose, and 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 the 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 particularly 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 Tyrophagus putrescentiae. 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 plants 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. The spraying solution can be used to control the pests by spraying a sufficient amount onto the pests or the crops where pests have occurred according to a conventional method using a hand sprayer, a knapsack sprayer, a power sprayer, a boom sprayer, a speed sprayer, etc. 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 with reference to 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 Glister 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 octaelucate (Shakamoto Yakuhin Kogyo Co., Ltd.; trade name SY Glister 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 octalaurate (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 Glister 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 Glister 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 (Shakamoto 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 (Shakamoto 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 (Shakamoto 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 (Shakamoto 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 obtained by the following calculation formula, and the results were 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 untreated plot / number of insects after treatment in the untreated 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 performed according to the criteria in Table 1, and the results were 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 inside a plastic greenhouse. One day after the treatment, the phytotoxicity evaluation was conducted based on the criteria in Table 1 when the compositions of each example and comparative example were used, and the results were summarized in Table 2.

[0050] Table 1 Phytotoxicity evaluation criteria TIFF0007684093000001.tif32102

[0051] Table 2 List of test results TIFF0007684093000002.tif138125

[0052] As shown by the results of Test Examples 1 to 3, despite the high concentration of 100-fold dilution, no severe phytotoxicity symptoms were observed on the kidney bean leaves and eggplant flowers for the pest control composition of the present invention. It was also confirmed that even at a low concentration of 1000-fold dilution, it has a sufficiently high control effect against Tetranychus urticae. On the other hand, the compositions of the comparative examples either had a high control effect but phytotoxicity symptoms were observed, or had no observed phytotoxicity symptoms but a low control effect, or had observed phytotoxicity symptoms 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, and 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 were 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 was 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 significantly affect the physical properties, quality improvement as a formulation such as adjustment of appearance and viscosity, improvement of emulsifiability, and a 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 pesticidal 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 pesticidal composition of the present invention is used for the purpose of controlling pests in agricultural and horticultural plants. The pesticidal composition according to the present invention uses polyglycerol fatty acid ester, which ensures safety to the human body, as an active ingredient and exhibits a sufficient pesticidal effect in application at a low concentration. Furthermore, the pesticidal 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) 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 acid is 12 to 22, and (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 (excluding the (a) polyglycerol fatty acid ester), sorbitan fatty acid ester, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene sorbit fatty acid ester, and sucrose fatty acid ester, and does not contain a pesticidal active ingredient selected from fungicides, insecticides, acaricides, herbicides, and plant growth regulators, a pest control agent.

2. The pest control composition according to claim 1, wherein the fatty acid constituting (a) 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 glycerol fatty acid ester, polyoxyethylenated castor oil, polyglycerol fatty acid ester (excluding the (a) 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 the fatty acid constituting (b) 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 the HLB of (b) 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, wherein the pest is one or more organisms belonging to an animal order selected from the orders Hemiptera, Acarina, and Thysanoptera.

8. A spraying solution obtained by diluting the pest control composition according to any one of Claims 1 to 7 with water.

9. A spraying solution obtained by including other pesticides in the spraying solution according to Claim 8.

10. A method for controlling pests, characterized in that the spraying solution according to Claim 8 or 9 is directly sprayed on pests or crops where pests occur.

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