JP2023033588A - herbicide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a herbicide that allows an effect of repelling creeping pests to be exhibited in a short time after treatment.

SOLUTION: A herbicide contains pelargonic acid and an insecticide that exerts an insecticidal effect on creeping pests in a state of adhering to weeds. A contained amount of at least one of pelargonic acid, acetic acid and d-limonene is 2.0 wt.% or more. The insecticide is a contact insecticide that exert a repellent effect when creeping pests come into contact therewith. The contact insecticide is only one or a mixture of any two or more among etofenprox, acrinathrin, silafluofen, chlorpyrifos, propetamphos, fenitrothion, pyridafenthion, fipronil, dinotefuran, imidacloprid, chlorfenapyr, thiamethoxam, clothianidin, indoxacarb, and ethiprole.

SELECTED DRAWING: None

COPYRIGHT: (C)2023,JPO&INPIT

Description

TECHNICAL FIELD The present invention relates to a herbicide for removing weeds, for example, and particularly belongs to the technical field of containing an agent having a repelling effect against pests.

Patent Literature 1 discloses incorporating an insecticide into a herbicide in which a plurality of active ingredients are combined.

Patent Document 2 discloses the incorporation of a herbicide into a harmful animal repellent composition comprising a terpenoid compound monomer and its low polymer compound and low copolymer compound.

Patent Document 3 discloses incorporating a herbicide into a harmful animal repellent composition comprising a specific organic amine having a boiling point of a predetermined level or higher.

Japanese Patent No. 4625089 Japanese Patent Publication No. 7-521 JP-A-5-70302

By the way, where weeds grow thickly, many crawling pests such as ants and pill bugs inhabit in addition to flying pests such as mosquitoes. It is believed that the use of herbicides containing insecticides such as those disclosed in Patent Documents 1 to 3 and harmful animal repellent compositions containing herbicides will make it possible to exterminate pests and remove weeds at the same time. .

However, even if a herbicide or the like as in Patent Documents 1 to 3 is used, it is difficult for the insecticide component and the repellent component to reach the vicinity of the ground where weeds grow thickly, and the repellent effect against crawling pests in particular is not sufficient. , is considered to be difficult to appear.

The present invention has been made in view of this point, and its object is to make the effect of repelling creeping pests appear in a short period of time after treatment.

In order to achieve the above object, in the present invention, a pest repellent is incorporated into a herbicide with immediate effect.

A first invention is characterized by containing at least one of pelargonic acid, acetic acid and d-limonene, and an insect repellent.

According to this configuration, the weeds wither and droop in a short period of time after the treatment, so the pest repellent adhering to the weeds approaches or adheres to the ground. As a result, a repellent effect can be obtained even for crawling pests such as ants and pill bugs. In particular, hanging weeds near the nest provides a high repellent effect against pests that enter and exit the nest.

Further, the pest repellent is characterized by being a contact repellent that exerts a repelling effect upon contact with pests.

According to this configuration, when the herbicide is applied to the weeds, the contact repellent also adheres to the weeds because the herbicide contains the contact repellent. For example, when mosquitoes, which are flying pests, come into contact with weeds in an attempt to stay on the weeds, their bodies come into contact with the contact repellent agent, and as a result, a repelling effect can also be obtained against the flying pests.

In addition, since the contact repellent is a chemical that is difficult to evaporate compared to the spatial repellent, it continues to adhere to withered weeds for a long period of time, and is effective against not only crawling pests that come into contact with the weeds but also flying pests. Provides repellent effect.

Moreover, it is characterized by containing pelargonic acid.

According to this configuration, since pelargonic acid is contained, the immediate effect of weeding is further enhanced, and the time until weeds wither and droop is shortened.

According to the first aspect of the invention, since the pest repellent is contained in the herbicide having an immediate effect, the repelling effect against creeping pests can be exhibited in a short time after treatment.

In addition, the pest repelling effect can be maintained for a long period of time.

Hereinafter, embodiments of the present invention will be described in detail. It should be noted that the following description of preferred embodiments is essentially merely illustrative, and is not intended to limit the invention, its applications, or its uses.

A herbicide according to an embodiment of the present invention is a liquid agent containing at least a contact repellent that exhibits a repellent effect upon contact with pests, a spatial repellent, pelargonic acid, and glyphosate. Contact repellents and spatial repellents are pest repellent ingredients. Pelargonic acid and glyphosate are herbicidal ingredients and are intended to kill plants such as vegetation and weeds. Moreover, the herbicide may contain water for diluting each component, or may contain a surfactant, a solvent, and the like.

The contact repellent is a non-transpirationable pest repellent having a vapor pressure of less than 1.0×10 ⁻⁵ mmHg at 25° C., preferably less than 1.0×10 ⁻⁶ mmHg at 25° C. is a pest repellent. As the contact repellent, for example, pyrethroid and organic phosphorus pest repellents are preferably used. Pyrethroid pest repellents for contact repellents include, for example, tralomethrin, bifenthrin, permethrin, phenothrin, cypermethrin, cyphenothrin, cyfluthrin, phthalthrin, resmethrin, etofenprox, acrinathrin, and silafluofen. Examples of organic phosphorus pest repellents for contact repellents include chlorpyrifos, propetamphos, fenitrothion, pyridafenthion, fipronil, dinotefuran, imidacloprid, chlorfenapyr, thiamethoxam, clothianidin, indoxacarb, and ethiprole. . In addition, those obtained by microencapsulating these are also used. Among these, it is preferable to use tralomethrin, bifenthrin, fipronil, dinotefuran, and imidacloprid. Moreover, among these, only 1 type can also be used and arbitrary 2 or more types can also be mixed and used.

The spatial repellent is an easily transpirationable pest repellent having a vapor pressure of 1.0×10 ⁻⁵ mmHg or more at 25° C., preferably 1.0×10 ⁻⁴ mmHg or more at 25° C. is a pest repellent. As the spatial repellent, for example, a pyrethroid pest repellent is preferably used. Examples of pyrethroid pest repellents for spatial repellents include empenthrin, transfluthrin, metofluthrin, profluthrin, and terarethrin. Moreover, among these, only 1 type can also be used and arbitrary 2 or more types can also be mixed and used.

The herbicide contains emulsified pelargonic acid, but may contain non-emulsified pelargonic acid. The contents of glyphosate and pelargonic acid are set so that the content of pelargonic acid is higher than the content of glyphosate. Specifically, the content of pelargonic acid is preferably 2.0% by weight or more, more preferably 2.5% by weight or more. The upper limit of the content of pelargonic acid can be, for example, 5.0% by weight. This is because even if the content of pelargonic acid is 5.0% by weight or more, the immediate effect does not increase so much.

In this embodiment, the herbicide is emulsified with pelargonic acid, so the herbicidal effect of pelargonic acid is greater than that of a herbicide in which a salt of pelargonic acid is dissolved. The herbicidal effect is rapid by lowering the internal pH and destroying the cells. Therefore, the time until the weeds wither and droop is further shortened.

If the pelargonic acid content is less than 2.0% by weight or more, the weeds take longer to wither and the immediate effect is reduced. However, it is possible to obtain a high weeding effect so that the immediate effect can be sufficiently felt. A pelargonic acid content of 2.5% by weight or more is preferable because a higher herbicidal effect can be obtained, and the content is more preferably 3.0% by weight or more.

In addition, at least one of pelargonic acid, acetic acid and d-limonene may be contained as a fast-acting herbicide. The herbicidal effect appears quickly even when acetic acid alone or d-limonene alone is contained as a fast-acting herbicide.

Glyphosate permeates through the stems and leaves of the plant and is then transported throughout the plant body, inhibiting amino acid synthesis, thereby killing the entire plant. It is superior to pelargonic acid in that it can wither up to.

In addition, the content of glyphosate is set to 0.5% by weight or more, preferably 1.0% by weight or more. The upper limit of the content of glyphosate is preferably 2.0% by weight, for example. This is because even if the content of glyphosate is 2.0% by weight or more, the herbicidal effect of glyphosate does not increase so much.

If the glyphosate content is less than 0.5% by weight, depending on the type of weed, the time required for the roots to surely wither will be longer. It is possible to obtain a high herbicidal effect on weeds over a long period of time.

Since the herbicide is a liquid, it can be applied to the weeds, for example, by spraying it from above the weeds. The herbicide can be put into a container that can be easily sprayed, for example, a resin container with a capacity of about 1000 ml to 2000 ml, and can be commercialized. A spray nozzle, shower nozzle, or the like with a built-in pump mechanism can be attached to the container.

The herbicide can also be contained in an aerosol can along with the propellant to form an aerosol product. Examples of the propellant include LPG (liquefied petroleum gas).

Next, the effect of the herbicide will be described separately for herbicidal effect and pest repellent effect. First, the herbicidal effects of immediate effect, transferability, and persistence will be explained based on the test results. In the rapid-acting test, as test plants (weeds), oxalis (a perennial weed of the Oxalis family), mugwort (a perennial weed of the Asteraceae family) and crabgrass (an annual weed of the Gramineae family) were used. The test method is to cut the leaves of weeds from the leaves and branches, arrange them on white paper with water absorption, spray the test agent so that the entire leaf is completely wet, measure the elapsed time from the start of spraying, and measure the spraying time. After 5 minutes, 10 minutes, 20 minutes, 30 minutes, 40 minutes, 60 minutes, 90 minutes, and 120 minutes from the start, the leaves were observed.

A herbicide (Example 1) containing 3.0% by weight of emulsified pelargonic acid, 1.0% by weight of a contact repellent, a spatial repellent, and glyphosate was prepared as a test agent. .

When oxalis was sprayed with the herbicide of Example 1, the leaves began to turn brown 5 minutes after the start of spraying, and 100% of the leaves turned brown or withered after 30 minutes. That is, it can be seen that the immediate effect is high. Further, when mugwort was sprayed with the herbicide of Example 1, the leaves began to turn brown 30 minutes after the start of spraying, and more than 90% of the leaves turned brown or withered after 120 minutes. Further, when crabgrass was sprayed with the herbicide of Example 1, the leaves began to turn brown 30 minutes after the start of spraying, and 100% of the leaves turned brown or withered after 90 minutes.

In the migration test, oxalis planted in a pot was prepared as a test plant (weed). The test method is to apply the test agent to 50% of the leaves, measure the elapsed time from the start of application, and 1 day, 2 days, 3 days, and 7 days after the start of application. Observations were made on how the oxalis withered.

As test agents, the herbicide of Example 1 and the herbicide of Comparative Example 1 containing glyphosate but not containing pelargonic acid (containing 1.0% by weight of glyphosate) were prepared.

When the herbicide of Example 1 was sprayed on Oxalis planted in a pot, most of the plants withered 3 days after the start of spraying, and all withered after 7 days. In other words, it can be seen that the herbicide has a high transferability to the roots and can kill even the roots. On the other hand, when the herbicide of Comparative Example 1 was sprayed on Oxalis planted in a pot, the withered portion was smaller than in Example 1 after 3 days, but the whole withered after 7 days.

For the durability test, a place where weeds with a height of about 20 cm were growing outdoors was selected, a 30 cm square area was prepared as a test area, and the area before the herbicide was sprayed (before treatment) was photographed and recorded. 1 day, 2 days, 3 days, 7 days, 2 weeks, and 3 weeks after the treatment were taken and recorded, and compared with the test area before treatment.

As test agents, the herbicide of Example 1 and the herbicide containing glyphosate of Comparative Example 2 (containing 0.86% by weight of glyphosate) were prepared. The treatment amount was substantially uniform so as to be 100 ml/m ² .

When treated with the herbicide of Example 1, almost all the weeds in the test plot died after one day, and almost no weeds newly grew even after three weeks. In other words, it can be seen that the herbicidal effect persists over a long period of at least 3 weeks. On the other hand, when treated with the herbicide of Comparative Example 2, almost no weeds in the test plot died even after 1 day, and some weeds remained without dying even after 3 days. After one week, almost all the weeds in the test plot died, and this state was maintained until three weeks had passed.

Next, the pest repelling effect will be explained. Regarding the repelling effect against insect pests, the effect of repelling crawling insects and the effect of repelling flying insects will be mainly explained based on test results. Regarding the effect of repelling creeping pests, a place where weeds with a height of about 30 cm are growing outdoors is selected, a 30 cm square area is prepared as a test area, and mainly creeping pests (ants, pill bugs, woodlice, spiders, etc.) are prepared in the test area. , terrestrial mollusks, beetles) are counted and then each test agent is sprayed. Before spraying, 11 ants, 2 pill bugs, 10 woodlice, 2 spiders and 1 beetle were confirmed.

Spraying was carried out in a 200 cm square around the test area. Immediately after spraying, and after 3, 7, 21, 33 and 42 days, the creeping pests were counted.

Example 2 was a herbicide containing 3.0% by weight of emulsified pelargonic acid, tralomethrin as a contact repellent, transfluthrin as a spatial repellent, and 1.0% by weight of glyphosate. In Example 2, the content of tralomethrin was adjusted to 0.0091% by weight. Example 3 contains all of the ingredients of Example 2 and is prepared with a tralomethrin content of 0.0182% by weight. Example 4 contains all the ingredients of Example 2 and is prepared with a tralomethrin content of 0.0303% by weight. Example 5 contains all of the ingredients of Example 2 and is prepared with a tralomethrin content of 0.0910% by weight. In addition, as Comparative Example 3, a general pest repellent (transfluthrin) was prepared.

The treatment amount was substantially uniform so as to be 100 ml/m ² . With this treatment amount, Example 2 resulted in a spray rate of 9 mg/m ² of tralomethrin, Example 3 resulted in a spray rate of 18 mg/m ² of tralomethrin, and Example 4 resulted in a spray rate of 30 mg/m ² of tralomethrin. In Example 5, the application amount of tralomethrin is 91 mg/m ² .

When the herbicides of Examples 2 to 5 were sprayed, the number of crawling pests was 0 for 7 days after spraying. In Example 2, 21 days after spraying, a few ants were found, but no other creeping pests were found. In Example 3, the number of crawling pests was 0 even after 21 days from spraying. After 33 days, a few ants and beetles were found, but no other creeping pests were found. In Example 4, 21 days after spraying, several pill bugs were found, but no other creeping pests were found. In Example 5, the number of crawling pests was 0 even after 21 days from spraying. After 33 days, a few spiders and terrestrial mollusks were found, but no other creeping pests were found. Therefore, in Examples 2 to 5, it can be seen that the effect of repelling crawling pests is maintained for a long period of time.

On the other hand, in the case of Comparative Example 3, the number of crawling pests was 0 immediately after spraying, but after 3 days, 8 ants were confirmed, and after 7 days, 11 ants, pill bugs, and several woodlice were confirmed. was done. Nearly 40 ants were found after 21 days.

Next, the effect of repelling flying pests will be described. Regarding the repelling effect against flying pests, it was carried out by the decoy method outdoors where Aedes albopictus (flying pests) are occurring. The tester stood in the center of the test plot with both arms exposed, counted the number of Aedes albopictus that tried to suck blood, and captured the Aedes albopictus with a fluke tube. The test area was a 4.5m square grassy area, and was prepared at three locations. Test times are 10 minutes each. As Example 6, the test preparation contained all of the components of Example 2, and when it was sprayed substantially uniformly at 100 ml/m ² , the amount of tralomethrin sprayed was 18 mg/m ² , and the amount of transfluthrin was 18 mg/m 2 . The amount of each component was set so that the spray amount was 8 mg/m ² .

1 hour, 2 hours, 3 hours, 6 hours, 9 hours, 1 day after the herbicide of Example 6 was sprayed approximately uniformly on each of the above test plots so as to be 100 ml / m ² , After 7 days, the number of Aedes albopictus captured was counted. Then, after 9 hours had passed, only a few fish were caught, and no other fish were caught. In other words, it can be seen that the effect of repelling flying pests is maintained for a long period of time. It is presumed that there is a similar repellent effect against flying pests other than Aedes albopictus.

Next, the test results of the insecticidal effect of the herbicide will be explained. Test insects for the insecticidal test are mysid ants and pill bugs. Example 6 is the test agent. Then, the test insect was placed in a petri dish lined with filter paper, and 1 ml of the test agent was sprayed on the test insect with a hand spray. After spraying, the time until the test insects were knocked down (a startled state, unable to move) was measured. The KT50 was about 3 minutes and 40 seconds in the case of the reticulum ant, and the KT50 was about 4 minutes and 10 seconds in the case of the pill bug. In other words, it can be seen that an excellent insecticidal effect against creeping pests can be obtained.

As described above, in this embodiment, since the herbicide contains the contact repellent, the pest repelling effect can be maintained for a long period of time. In addition, by using a non-transpirationable pest repellent having a vapor pressure of less than 1.0×10 ⁻⁵ mmHg at 25° C., the duration of the repelling effect against flying pests and creeping pests can be extended for a longer period of time. can be done.

In addition, since the herbicidal effect of pelargonic acid appears quickly, the weeds tend to droop, and the drooping of the weeds causes the contact repellent adhering to the weeds to approach or adhere to the ground. As a result, a repellent effect can be obtained even for crawling pests such as ants and pill bugs. In particular, hanging weeds near the nest provides a high repellent effect in a short period of time against pests that enter and leave the nest.

In addition, since it is a herbicide emulsified with pelargonic acid, compared to a herbicide in which a salt of pelargonic acid is dissolved, the herbicidal effect of pelargonic acid, that is, it penetrates from the foliage surface of weeds and lowers the intracellular pH. The herbicidal effect appears quickly by destroying the cells. Therefore, the time until the weeds wither and droop is further shortened.

In addition, since the above herbicide contains a contact repellent, a pest repellent method can be performed in which the contact repellent adheres to plants by spraying the herbicide. In addition, since the spatial repellent also adheres to weeds, the weeds serve as a carrier for retaining the contact repellent and the spatial repellent. For example, when a mosquito, which is a flying pest, comes into contact with weeds in an attempt to stay on the weeds, the body comes into contact with the contact repellent agent, thereby obtaining a repellent effect. In addition, when the contact repellent adheres to short weeds, it is effective in repelling crawling pests such as ants and pill bugs. Also, by adhering the contact repellent to weeds growing near the nest, a high repelling effect can be obtained against pests that enter and leave the nest. Furthermore, since the contact repellent is a chemical that is less likely to evaporate compared to the spatial repellent, it continues to adhere to weeds for a long period of time, and a repelling effect can be obtained against flying and crawling insects that come into contact with the weeds. . Incidentally, the contact repellent can also be attached to various plants.

In addition, since the spatial repellent evaporates easily, the spatial repellent evaporates around the weeds, and a pest repelling effect can be obtained over a wide area.

The above-described embodiments are merely examples in all respects and should not be construed in a restrictive manner. Furthermore, all modifications and changes within the equivalent range of claims are within the scope of the present invention.

The herbicide according to the present invention can be used, for example, on grassy areas inhabited by insect pests.

Claims (1)

2.0% by weight or more of pelargonic acid;
only one or any two or more of etofenprox, acrinathrin, silafluofen, chlorpyrifos, propetamphos, fenitrothion, pyridafenthion, fipronil, dinotefuran, imidacloprid, chlorfenapyr, thiamethoxam, clothianidin, indoxacarb and ethiprole,
herbicide containing