Herbicidal Composition

Abstract

To provide a herbicide composition that has excellent stability over time, high rapid-acting property and residual effectiveness.SOLUTION: Provided is a herbicide composition that contains pelargonic acid and any one or more cationic surfactant selected from monoalkyl type cationic surfactant and dialkyl type cationic surfactant, and in which the pelargonic acid forms mixed vesicle and is present in water, and glyphosate salt is dissolved and present in water.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a herbicidal composition, particularly to a technical field that contains pelargonic acid and glyphosate salts. More specifically, the present invention relates to a herbicidal composition that has excellent long-term stability even if it contains glyphosate salts, by forming a mixed vesicle of pelargonic acid, which is a herbicidal active ingredient, and one or more cationic surfactants, and has rapid and residual effect. [Background technology]

[0002] Fatty acids with 6 to 12 carbon atoms, particularly pelargonic acid (common name: Pelargonic acid, IUPAC name: Nonanoic acid), which has 9 carbon atoms, are safe and rapidly acting herbicidal compounds and are widely used around the world (Patent Document 1).

[0003] Pelargonic acid is also used as a food additive and is attracting attention as a herbicidal active ingredient with a safe image, and there is a growing demand for herbicides that use pelargonic acid. Pelargonic acid is a hydrophobic substance with a solubility in water of 32 ppm (30°C), and the development of a herbicide using pelargonic acid requires technology to solubilize or emulsify pelargonic acid.

[0004] For example, Patent Document 1 discloses a formulation technique in which pelargonic acid is stably present in water as an acid by using water as the main solvent and combining an anionic surfactant and a nonionic surfactant.

[0005] Moreover, Patent Document 2 discloses a technique for emulsifying pelargonic acid using a quaternary ammonium salt as a surfactant.

[0006] On the other hand, Patent Documents 3 and 4 disclose preparations in which the water solubility of pelargonic acid is improved by neutralizing it with an organic base. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2016-190832 A [Patent Document 2] Special Publication No. 5-502216 [Patent Document 3] JP 2013-216643 A [Patent Document 4] JP 2014-91739 A Summary of the Invention [Problem to be solved by the invention]

[0008] As described above, the prior art includes preparations in which pelargonic acid exists in an acid form in water and is emulsified or solubilized with a surfactant (Patent Documents 1 and 2), and preparations in which pelargonic acid is neutralized with a basic substance to improve its water solubility (Patent Documents 3 and 4). The former, in which pelargonic acid exists as an acid, is known to exhibit a more rapid herbicidal effect than the latter, and is more desirable in that consumers can easily feel the herbicidal effect.

[0009] Incidentally, commercially available general-purpose herbicides are often sold in spray containers. In general households, such herbicides are often left outdoors or in warehouses in their containers, and are highly likely to be exposed to low and high temperature conditions. In such harsh storage environments, pelargonic acid may separate from conventional pelargonic acid herbicides emulsified and solubilized by surfactants. Therefore, there is a demand for a pelargonic acid herbicide composition that can stably maintain a uniformly dissolved and dispersed state even under such harsh storage conditions. It is possible to increase the amount of surfactant to improve storage stability, but this is not realistic because the price increases with the increase in surfactant, and the viscosity of the product increases, causing problems such as a decrease in spray efficiency and uneven spraying. Thus, conventional pelargonic acid herbicides produced by conventional emulsification and solubilization methods still have insufficient stability and there is room for improvement.

[0010] In addition, the herbicidal effect is not temporary, and residual activity that lasts for a certain period of time after application is also required. Therefore, in addition to pelargonic acid, which is a fast-acting herbicidal ingredient, glyphosate salts that are expected to have a long-lasting herbicidal effect can be added. However, it is well known that the stability of compositions emulsified and solubilized by conventional methods is impaired by the addition of salt substances such as glyphosate salts. In other words, it was extremely difficult to stably maintain a uniformly dissolved and dispersed state in conventional pelargonic acid herbicides even under harsh storage conditions after adding ingredients with residual activity.

[0011] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a herbicide which is excellent in stability over time and has a high rapid effect and residual effect. [Means for solving the problem]

[0012] In order to achieve the above object, the present inventors have found a concentration range in which pelargonic acid having a carbonyl group and a cationic surfactant having a specific quaternary amine group can interact in water to form a mixed vesicle of self-aggregation. The inventors have also found that the formation of such mixed vesicles allows pelargonic acid to be uniformly dissolved and dispersed in water and stabilized for a long period of time, and that the uniformly dissolved and dispersed state of the pelargonic acid can be maintained even if glyphosate salts, which are long-lasting herbicidal ingredients, are dissolved in the water, thereby completing the present invention.

[0013] That is, the mixed vesicle is a self-association in which amphiphilic molecules having both hydrophobic and hydrophilic properties are arranged without gaps to form spheres, rods, layers, etc. in water, and since the self-association forms multiple layers, pelargonic acid is uniformly contained, and high concentration pelargonic acid can be stabilized in water for a long time. And even if glyphosate salts, which are water-soluble components, are dissolved in the water containing this mixed vesicle, the mixed vesicle is maintained for a long time without becoming unstable.

[0014] The herbicidal composition according to the present disclosure contains at least pelargonic acid and glyphosate salts as herbicidal active ingredients, and further contains one or more cationic surfactants and water. The glyphosate salts dissolve in the water, and mixed vesicles are formed by the pelargonic acid and the cationic surfactant, so that the pelargonic acid is uniformly dissolved and dispersed in the water.

[0015] However, in a herbicide containing pelargonic acid and glyphosate salts as herbicidal active ingredients, if the pelargonic acid and glyphosate salts do not adhere to the surface of weeds when sprayed, it is considered that sufficient herbicidal effect cannot be obtained. In contrast, the mixed vesicle pelargonic acid according to the present invention is contained in a self-association body by interacting with a cationic surfactant, but it has not been examined whether the pelargonic acid can adhere to the surface of weeds when sprayed on weeds. Through the examination by the present inventors, it has been confirmed that a herbicidal effect is high by a herbicidal composition consisting of mixed vesicles of pelargonic acid and glyphosate salts.

[0016] In other words, in water in which glyphosate salts are dissolved, a specific cationic surfactant and pelargonic acid are uniformly dispersed and dissolved as self-aggregates of mixed vesicles, and when sprayed, the pelargonic acid that constituted the mixed vesicles adheres to the surface of weeds. This provides excellent long-term stability and high herbicidal effect even when left under low or high temperature conditions.

[0017] The concentration of the pelargonic acid may be in the range of 1.5% by mass to 8.0% by mass, or in the range of 2.0% by mass to 7.0% by mass.

[0018] The concentration range of the glyphosate salts may be from 0.1% by mass to 5.0% by mass, or from 0.5% by mass to 4.0% by mass.

[0019] When the concentration of the pelargonic acid is a and the concentration of the glyphosate salt is b, the concentration ratio R1=b / a may be 0.014 or more and 2.00 or less. Also, the concentration ratio R1=b / a may be 0.1 or more and 1.5 or less.

[0020] The concentration of the cationic surfactant may be in the range of 2.0% by mass to 12.0% by mass, or in the range of 10.0% by mass or less.

[0021] When the combined concentration of the pelargonic acid and the glyphosate salt is a+b and the concentration of the cationic surfactant is c, the concentration ratio R2=c / (a+b) may be 0.30 or more and 1.90 or less. Also, the concentration ratio R2=c / (a+b) may be 0.50 or more and 1.80 or less.

[0022] Additionally, the pH of the herbicidal composition according to the present disclosure is 5.0 or less. Effect of the Invention

[0023] According to the present invention, a cationic surfactant and pelargonic acid form mixed vesicles in water, and high concentration pelargonic acid is uniformly dispersed and dissolved in water, thereby making it possible to obtain a herbicide that has excellent long-term stability even in the presence of glyphosate salts, and has high rapid-acting and residual activity. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, the embodiments of the present invention will be described in detail. Note that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0025] The herbicide composition according to the embodiment of the present invention is a liquid herbicide containing pelargonic acid as a herbicidally active ingredient, glyphosate salts as a herbicidally active ingredient, a specific cationic surfactant, water, and a specific alcohol. The herbicide composition can be stored, for example, in various containers. By storing the herbicide composition in a container, a product used for weed control is formed. The herbicide composition can be used by directly spraying it on weeds from the container in which it is stored, or it can be transferred to a container other than the container in which it is stored and sprayed on weeds. The container that stores the herbicide composition may be provided with a shower nozzle with a number of openings. The container that stores the herbicide composition may also be provided with a sprayer equipped with a pump mechanism. The container that stores the herbicide composition may also be an aerosol container equipped with a valve and a nozzle, and in this case, the herbicide composition according to the present invention is filled into the aerosol container together with a propellant.

[0026] (Pelargonic acid is a herbicidal active ingredient) Pelargonic acid, which is the fast-acting herbicidal ingredient of the present invention, may be used alone or as a major ingredient (e.g., 90% or more) of a mixture containing other fatty acids. When other fatty acids are contained, the herbicidal ingredient may be one or a mixture of carboxyl fatty acids having a hydrocarbon chain of 8 to 12 carbon atoms, including pelargonic acid.

[0027] Pelargonic acid exists in water by forming mixed vesicles through interaction with cationic surfactants. That is, mixed vesicles are self-assemblies in which amphiphilic molecules having both hydrophobic and hydrophilic properties are arranged without gaps to form a spherical shell or bag shape in water, and since the self-assembly layers are in multiple phases, pelargonic acid is uniformly contained therein, which allows pelargonic acid to be stabilized in water for a long period of time.

[0028] The lower limit of the concentration range of pelargonic acid in the herbicidal composition is 1.5% by mass or more, more preferably 2.0% by mass or more. The upper limit of the concentration range of pelargonic acid is 8.0% by mass or less, more preferably 7.0% by mass or less. If the concentration range of pelargonic acid exceeds the upper limit, mixed vesicles are difficult to form, or the formed mixed vesicles are easily broken. In addition, if the concentration range of pelargonic acid is below the lower limit, the herbicidal effect becomes insufficient.

[0029] In the present invention, the pelargonic acid is present in the herbicide composition in the form of an acid (not a salt). In this way, since the pelargonic acid is present in the form of an unneutralized acid, it has a superior immediate effect compared to when it is formulated in the form of a salt. Since the pelargonic acid is present as an acid, the herbicide composition is acidic. When the pelargonic acid is in the above-mentioned concentration range, the pH of the herbicide composition is 5.0 or less.

[0030] (Glyphosate salts, a herbicidal active ingredient) Examples of glyphosate salts which are the residual herbicidal active ingredient of the present invention include ammonium glyphosate, isopropylamine glyphosate, and potassium glyphosate.

[0031] Glyphosate salts are water soluble and exist in dissolved form in water.

[0032] The lower limit of the concentration range of glyphosate salts is 0.1% by mass or more, more preferably 0.5% by mass. The upper limit of the concentration range of glyphosate salts is 5.0% by mass or less, more preferably 4.0% by mass or less. If the concentration range of glyphosate salts exceeds the upper limit, mixed vesicles are difficult to form, or the formed mixed vesicles are easily broken. In addition, if the concentration range of glyphosate salts is below the lower limit, the herbicidal effect becomes insufficient.

[0033] (Cationic Surfactant) In order to form the mixed vesicle in water, the specific cationic surfactant is required. The specific cationic surfactant is any one or any two or more cationic surfactants selected from a group of surfactants consisting of a plurality of surfactants classified as monoalkyl cationic surfactants and a plurality of surfactants classified as dialkyl cationic surfactants. The specific cationic surfactant may be only a monoalkyl cationic surfactant or only a dialkyl cationic surfactant. The specific cationic surfactant may contain a monoalkyl cationic surfactant and a dialkyl cationic surfactant. In this case, it may contain one monoalkyl cationic surfactant and two or more dialkyl cationic surfactants, or it may contain two or more monoalkyl cationic surfactants and one dialkyl cationic surfactant.

[0034] Examples of monoalkyl cationic surfactants include lauryl trimethyl ammonium chloride, myristyl trimethyl ammonium chloride, cetyl trimethyl ammonium chloride, stearyl trimethyl ammonium chloride, behenyl trimethyl ammonium chloride, alkyl (C12-C16) trimethyl ammonium chloride, and alkyl (C16-C18) trimethyl ammonium chloride.

[0035] Examples of the dialkyl cationic surfactant include dioctyldimethylammonium chloride, didecyldimethylammonium chloride, dilauryldimethylammonium chloride, dialkyl(C12-C18)dimethylammonium chloride, dialkyldimethylammonium chloride, and dialkyl(C16-18)dimethylammonium chloride.

[0036] The lower limit of the concentration range of the specific cationic surfactant is 2.0% by mass or more, and more preferably 3.0% by mass or more. The upper limit of the concentration range of the cationic surfactant is 12.0% by mass or less, and more preferably 10.0% by mass or less. If the concentration range of the specific cationic surfactant is outside the above range, it becomes difficult to form mixed vesicles.

[0037] (Monohydric or polyhydric alcohol) In order to ensure the formation of the mixed vesicles, it is preferable that the herbicide composition contains a specific alcohol. The specific alcohol is a monohydric or polyhydric alcohol, and an alcohol having 2 to 6 carbon atoms and 1 to 6 hydroxyl groups can be used. Examples of such alcohols include ethyl alcohol, propyl alcohol, isopropyl alcohol, 1,3 butylene glycol, propylene glycol, dipropylene glycol, glycerin, sorbitol, etc. In addition, if the herbicide composition does not contain a glyphosate salt, good results can be obtained with either a monohydric or polyhydric alcohol, but it has been revealed that in the case of the herbicide composition of the present invention containing a glyphosate salt, the formation of mixed vesicles may become unstable with a polyhydric alcohol. For this reason, a monohydric alcohol is particularly preferable as the alcohol.

[0038] By using the above alcohol, the mixed vesicle is more reliably formed. The lower limit of the alcohol concentration range is 0.01% by mass or more, preferably 2.0% by mass or more, and more preferably 2.5% by mass or more. The upper limit of the alcohol concentration range is 10% by mass or less, and more preferably 6.0% by mass or less. If the alcohol concentration range is outside the above range, the mixed vesicle is difficult to form, or the formed mixed vesicle is easily broken.

[0039] (Concentration ratio of pelargonic acid and glyphosate salts R1=b / a) In addition, when the concentration of pelargonic acid is a and the concentration of the glyphosate salts is b, the concentration ratio R1 of the glyphosate salts to pelargonic acid can be expressed by the following formula 1.

[0040] R1=b / a Equation 1 The lower limit of R1 is 0.014 or more, and more preferably 0.1 or more. The upper limit of R1 is 2.00 or less, and more preferably 1.5 or less. If the value of R1 is outside the above range, it becomes difficult to form mixed vesicles.

[0041] (Ratio of concentration of pelargonic acid and glyphosate salts to cationic surfactant R2 = c / (a+b)) In addition, when the combined concentration of pelargonic acid and glyphosate salts is a+b and the concentration of the specific cationic surfactant is c, the concentration ratio R2 can be expressed by the following formula 2.

[0042] R2=c / (a+b) Equation 2 The lower limit of R2 is 0.30 or more, and more preferably 0.50 or more. The upper limit of R2 is 1.90 or less, and more preferably 1.80 or less. If the value of R2 is outside the above range, it becomes difficult to form mixed vesicles.

[0043] (Other ingredients) The water may be purified water or ion-exchanged water. The herbicide may contain a preservative. Examples of the preservative include, but are not limited to, isothiazolinone derivatives.

[0044] The herbicide may also contain a pest control component. Examples of the pest control component include, but are not limited to, pyrethroid insecticides, neonicotinoid insecticides, and diamide insecticides. Examples of pyrethroid insecticides include transfluthrin, pyrethrin, allethrin, phthalthrin, tetramethrin, prallethrin, fenothrin, tralomethrin, cyfluthrin, resmethrin, permethrin, empenthrin, cyphenothrin, imiprothrin, fenpropathrin, fenvalerate, etofenprox, and silafluofen. Examples of neonicotinoid insecticides include imidacloprid, nitenpyram, acetamiprid, thiamethoxam, clothianidin, and dinotefuran. Examples of diamide insecticides include flubendiamide, chlorantraniliprole, and cyantraniliprole. Among these, one or a mixture of two or more can be used.

[0045] (Method of producing herbicidal composition) An example of a method for producing a herbicide composition will be described. First, purified water heated to 70°C is prepared. The specific cationic surfactant, pelargonic acid, glyphosate salts, and alcohol are dissolved in this purified water. If a pest control component is contained, the pest control component is also dissolved. Then, the mixture is cooled to room temperature, and a preservative is added.

[0046] (Example) Examples of the present invention will be described below, but the present invention should not be construed as being limited to these examples.

[0047] [Table 1]

[0048] Table 1 shows the composition of the herbicides according to Examples 1 to 17 of the present invention. The concentration of pelargonic acid in Examples 1 to 17 is 1.50% by mass or more and 8.00% by mass or less. The concentration of glyphosate salts is 0.50% by mass or more and 5.00% by mass or less. The concentration of monoalkyl cationic surfactant is 1.00% by mass or more and 8.00% by mass or less. The concentration of dialkyl cationic surfactant is 0.50% by mass or more and 4.00% by mass or less. The concentration of alcohol is 3.00% by mass or less. The concentration of preservative is 0.02% by mass. The balance is purified water.

[0049] The concentration ratio R1 of the concentration b of the cationic surfactant to the concentration a of the herbicide active ingredient is set in the range of 0.014 to 2.00, and the concentration ratio R2 is set in the range of 0.33 to 1.71.

[0050] (Appearance evaluation) After preparing the herbicidal composition samples of the Examples, they were placed in 100 ml glass bottles and visually evaluated for appearance at room temperature (RT). The same evaluation was also carried out for the Comparative Examples described below.

[0051] Translucent: Translucent liquid Cloudy: Cloudy liquid Separation: Liquid separated into two or more layers

[0052] (Confirmation and evaluation of mixed vesicles) After preparing the herbicide composition sample of the embodiment, it was placed in a 100 ml glass bottle and placed in a box with perpendicular polarizing plates (crossed Nicols) at room temperature (RT). The presence or absence of mixed vesicle formation was evaluated by shining light on the sample bottle from outside the polarizing plate box and visually observing the state of the light passing through the sample bottle through the polarizing plate. The same evaluation was also performed for the comparative examples described later.

[0053] ○: Mixed vesicles present ×: no mixed vesicles

[0054] As shown in Table 1, mixed vesicles were formed in all of Examples 1 to 17.

[0055] (Stability evaluation) Next, the results of the stability test will be described. In the stability test, each herbicide composition of Examples 1 to 17 was placed in a 100 ml glass bottle and stored for one month in a thermostatic chamber at room temperature (RT), 5°C, or 50°C. The condition (appearance) of the herbicide composition after one month of storage was visually evaluated, and the stability was evaluated according to the following criteria. The comparative examples described below were also evaluated in the same manner.

[0056] ○: No separation (single homogeneous phase). △: The upper and lower layers are partially separated. ×: Complete separation into two phases.

[0057] As shown in Table 1, Examples 1 to 17 were rated "○" at all temperatures of "RT", "5°C" and "50°C". In other words, the mixed vesicles continued to exist without being broken down, and it was found that separation and changes in properties were unlikely to occur even when stored for an extremely long period of time, such as one month, in the extremely wide temperature range of 5°C to 50°C. The same results were obtained even if no preservative was included.

[0058] Next, comparative examples 1 to 9 will be described.

[0059] [Table 2]

[0060] First, Comparative Examples 1 to 5 will be described. Comparative Examples 1 to 5 are examples in which the concentration of the cationic surfactant is 2.00 mass% or less, that is, the amount of the cationic surfactant is relatively small. In all of these examples, mixed vesicles were not formed, and the compositions were unstable. Comparative Examples 1 to 3 are examples in which the concentration of pelargonic acid is 1.50% by mass. Of these, Comparative Examples 1 and 2 are examples in which no alcohol is included. In Comparative Examples 1 and 2, the item "appearance (immediately after production)" was "separated," and mixed vesicles were not formed immediately after production. In other words, mixed vesicles were not formed immediately after production, and the results were "x" at all temperatures of "RT," "5°C," and "50°C," that is, the compositions were unstable.

[0061] On the other hand, Comparative Example 3 contains alcohol, but is "separated" in the "appearance (immediately after production)" category, and mixed vesicles were not formed immediately after production. In other words, mixed vesicles were not formed immediately after production, and the results were "x" at all temperatures of "RT", "5°C" and "50°C", that is, the composition was unstable. In this manner, in the low concentration range of pelargonic acid, the formation of mixed vesicles may be unstable even if alcohol is contained. Even in this concentration range, mixed vesicles can be formed by blending an appropriate amount of cationic surfactant, as shown in Example 1.

[0062] Comparative Examples 4 and 5 are examples in which the concentration of pelargonic acid is 2.00% by mass or more. Of these, Comparative Example 4 is an example in which the concentration ratio R2 is 0.50. In Comparative Example 4, the item "appearance (immediately after production)" was "separated", and mixed vesicles were not formed immediately after production. In other words, mixed vesicles were not formed immediately after production, and the results were "x" at all temperatures of "RT", "5°C", and "50°C", that is, the composition was unstable.

[0063] Comparative Example 5 is an example in which the concentration ratio R2 is 0.25. In Comparative Example 5, the item "appearance (immediately after production)" was "separated", and mixed vesicles were not formed immediately after production. In other words, mixed vesicles were not formed immediately after production, and the composition was rated "x" at all temperatures of "RT", "5°C", and "50°C", that is, it was an unstable composition.

[0064] As shown above in Comparative Examples 4 and 5, even if the concentration of pelargonic acid is within a range suitable for vesicle formation, if the amount of cationic surfactant is too small, mixed vesicles are not formed.

[0065] Next, Comparative Examples 6 to 8 will be described. Comparative Examples 6 to 8 are examples in which the concentration ratio R2 is 2.00 or more, that is, the cationic surfactant is more abundant than the herbicidal active ingredient. In all of these, mixed vesicles were not formed. In addition, the compositions were relatively stable in low temperature environments, but were unstable in other temperature environments.

[0066] Of these, Comparative Example 6 is an example in which the concentration of the cationic surfactant is 16.00% by mass. In this Comparative Example 6, the item "Appearance (immediately after production)" was "cloudy", and mixed vesicles were not formed immediately after production. In addition, the results were "good" at "RT" and "5°C", but "bad" at "50°C". In other words, the product was stable in a relatively low temperature environment, but unstable in a high temperature environment.

[0067] Comparative Example 7 is an example in which the cationic surfactant concentration is 15.00% by mass and isopropyl alcohol is contained. In this Comparative Example 7, the item "Appearance (immediately after production)" was "cloudy", and mixed vesicles were not formed immediately after production. In addition, it was "good" at "5°C", but "bad" at "RT" and "50°C". In other words, it was stable in a relatively low temperature environment, but unstable in a high temperature environment.

[0068] Comparative Example 8 is an example in which the cationic surfactant concentration is 15.00% by mass and ethyl alcohol is contained. In this Comparative Example 8, the item "Appearance (immediately after production)" was "cloudy", and mixed vesicles were not formed immediately after production. In addition, it was "good" at "5°C", but "bad" at "RT" and "50°C". In other words, it was stable in a relatively low temperature environment, but unstable in a high temperature environment.

[0069] As shown above in Comparative Examples 6 to 8, if the amount of cationic surfactant is too large relative to pelargonic acid, mixed vesicles are not formed, and the composition becomes unstable in low temperature environments but not in other environments.

[0070] On the other hand, Comparative Example 9 is an example in which the concentration ratio R2 is 1.91 and the concentration of pelargonic acid is 10.00% by mass. In this Comparative Example 9, the item "appearance (immediately after production)" is "separated", and mixed vesicles were not formed immediately after production. In other words, mixed vesicles were not formed immediately after production, and the results were "x" at all temperatures of "RT", "5°C", and "50°C", that is, the composition was unstable. Thus, if the concentration of pelargonic acid is too high, mixed vesicles are not formed, and the composition is unstable under all temperature environments.

[0071] Next, Examples 18 to 26 will be described.

[0072] [Table 3]

[0073] The concentration of pelargonic acid in Examples 18 to 26 is 2.50% by mass or more and 6.00% by mass or less. The concentration of glyphosate salts is 1.00% by mass or more and 2.00% by mass or less. The concentration of monoalkyl cationic surfactant is 2.00% by mass or more and 5.00% by mass or less. The concentration of dialkyl cationic surfactant is 1.00% by mass or more and 2.00% by mass or less. The concentration of alcohol is 3.00% by mass. The concentration of preservative is 0.02% by mass. The range of the concentration ratio R1 of cationic surfactant b to herbicide active ingredient a is set to 0.17 or more and 0.80 or less. The range of the concentration ratio R2 is set to 0.63 or more and 0.89 or less.

[0074] Moreover, a pest control component (insecticide component) is contained in Examples 18 to 26. The concentration of transfluthrin or tralomethrin is 0.01% by mass or more and 0.10% by mass or less.

[0075] In all of Examples 18 to 26, as described in the column "Appearance (immediately after production)," the herbicides immediately after production were translucent. In addition, mixed vesicles were formed in all of Examples 18 to 26.

[0076] (Weed control test) Next, the herbicidal test will be described. Table 4 shows the formulation of Comparative Example 10.

[0077] [Table 4]

[0078] Comparative Example 10 is an example containing pelargonic acid, triethanolamine, and glyphosate ammonium salt.

[0079] The herbicidal test method is as follows. First, wood sorrel, crabgrass, and green foxtail were prepared as test weeds. Each weed was transplanted into a pot, and the herbicides of the Examples and Comparative Examples were sprayed evenly over each weed using a hand sprayer with a discharge volume of 1 ml. The pots were then placed in an artificial weather chamber (temperature 25°C, humidity 60%), and the state of the weeds was recorded using the interval photography function of a camera. The results are shown in Table 5. In Table 5, the Example was the formulation of Example 24.

[0080] [Table 5]

[0081] In Example 24, the time until wood sorrel, crabgrass, and green foxtail began to wither was significantly shorter than that in Comparative Example 10. The time until withering was also significantly shorter in Example 24. The formulations of other Examples other than Example 24 can also provide similar herbicidal effects, although the time varies slightly.

[0082] (Effects of the embodiment) As described above, the herbicide of this embodiment contains at least pelargonic acid and glyphosate salts as herbicidal active ingredients, and further contains one or more cationic surfactants and water. The glyphosate salts dissolve in the water, and mixed vesicles are formed by the pelargonic acid and the cationic surfactant, so that the pelargonic acid is uniformly dissolved and dispersed in the water. This makes it possible to provide a herbicide with excellent long-term stability and high rapid-acting and residual effect.

[0083] The above-described embodiment is merely illustrative in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention. [Industrial Applicability]

[0084] As described above, the herbicidal composition according to the present invention can be used against various weeds.

Claims

1. A herbicide composition containing at least pelargonic acid and glyphosate salts as herbicidal active ingredients, further containing one or more cationic surfactants and water, wherein the glyphosate salts are dissolved in the water, and a mixed vesicle is formed by the pelargonic acid and the cationic surfactant, and when the combined concentration of the pelargonic acid and the glyphosate salts is a + b and the concentration of the cationic surfactant is c, the concentration ratio R2 = c / (a + b) is 0.30 or more and 1.90 or less.

2. The herbicide composition according to Claim 1, wherein the concentration range of the pelargonic acid is 1.5% by mass or more and 8.0% by mass or less.

3. The herbicide composition according to Claim 2, wherein the concentration range of the pelargonic acid is 2.0% by mass or more and 7.0% by mass or less.

4. The herbicide composition according to any one of Claims 1 to 3, wherein the concentration range of the glyphosate salts is 0.1% by mass or more and 5.0% by mass or less.

5. The herbicide composition according to Claim 4, wherein the concentration range of the glyphosate salts is 0.5% by mass or more and 4.0% by mass or less.

6. The herbicide composition according to any one of Claims 1 to 5, wherein when the concentration of the pelargonic acid is a and the concentration of the glyphosate salts is b, the concentration ratio R1 = b / a is 0.014 or more and 2.00 or less.

7. The herbicide composition according to Claim 6, wherein the concentration ratio R1 = b / a is 0.1 or more and 1.5 or less.

8. The herbicide composition according to any one of Claims 1 to 5, wherein the concentration range of the cationic surfactant is 2.0% by mass or more and 12.0% by mass or less.

9. The herbicide composition according to Claim 8, wherein the concentration range of the cationic surfactant is 10.0% by mass or less.

10. The herbicide composition according to Claim 1, wherein the concentration ratio R2 = c / (a + b) is 0.50 or more and 1.80 or less.

11. The herbicide composition according to any one of Claims 1 to 10, A herbicide composition characterized by having a pH of 5.0 or less. **Claim 12**: A herbicide composition containing at least pelargonic acid and glyphosate salts as herbicidal active ingredients, further containing one or more cationic surfactants and water, wherein the glyphosate salts are dissolved in the water, and a mixed vesicle is formed by the pelargonic acid and the cationic surfactant, characterized by having a pH of 5.0 or less.

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