JPH0548202B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] Concerning herbicides for controlling weeds in lawns. [Conventional technology] Japanese grass is cultivated everywhere, including golf courses, parks, roadsides, and gardens of ordinary households.
It is becoming increasingly important as a place for recreation. Weed control is particularly important in lawn growth management, but there are many weed species that invade the lawn.
Because each type of weed has a different physiological ecology, perennial weeds that are difficult to eradicate are gaining priority in many lawns. Weeds that have recently become widespread are broad-leaved perennials such as white clover, dandelion, sardine, oxalis, and plantain, as well as perennials of the Cyperaceae and Equisetaceae families, such as Hymekweed, Cucumber, and Equisetaceae. The compound groups represented by formula (1)- and formula (1)- all exhibit considerable activity against the above-mentioned weeds, albeit to varying degrees. However, there are no pesticides that can safely eradicate these weeds in lawns with a single spraying.
Even with a combination of several species, especially dandelion, sagebrush, plantain, horsetail, redweed, and common sedge, they will only temporarily wither and regrow after a while. For this reason, spot treatment is often used, in which large amounts are applied only to areas where weeds are growing.
Not only is it time-consuming, but it also has a negative impact on the surrounding lawn, sometimes leaving it bare. In addition, it can be said that it is actually impossible to perform sub-bot treatment in places where there is a large amount of intrusion. On the other hand, the compound represented by formula (2) is a herbicide that has been known for a long time, and is currently used in small amounts in non-agricultural lands, orchards, etc. There is no example of its application to Japanese grass, and according to studies by the present inventors, Japanese grass shows considerable resistance to the compound of formula (2), and in particular, Japanese grass shows remarkable resistance. It is a so-called soil treatment type herbicide, which has high activity almost non-selectively on seeds, but its activity decreases rapidly as the growth stage progresses. - The compound group is different from that of foliar treatment agents. [Problems to be Solved by the Invention] The present invention eliminates the drawbacks of these hormone-type herbicides, easily controls perennials of the broad-leaved, horsetail, and Cyperaceae families that are difficult to control, and has no adverse effects on lawns. The aim is to provide an excellent herbicide that does not cause harmful effects. [Means for Solving the Problems] In order to achieve the above-mentioned problems, the present inventors investigated many combinations of herbicides and found that formula (1)- and formula (1)- have different suitable treatment periods. By combining the compound group (hereinafter referred to as the compound (1) group) with the compound of formula (2), the herbicidal activity far exceeds that of each individual agent, from before the weeds emerge to the late stage of growth. It was discovered that weed activity could be obtained, and the present invention was completed. That is, the present invention is a herbicide containing a compound represented by general formula (1)- or (1)- and a compound represented by formula (2) as herbicidal active ingredients. (Formula (1) - where A represents a carbon atom or a nitrogen atom, and when A is a carbon atom and X is a hydrogen atom, Y
is a chlorine atom, and if X is a chlorine atom or a methyl group, Y is a hydrogen atom. R ₁ represents a hydrogen atom or a methyl group, and R ₂ represents a lower alkyl group (C ₂ to C ₄ ), a butoxyethyl group, or an alkali metal. When A is a nitrogen atom, X and Y are chlorine atoms,
R ₁ is a hydrogen atom, R ₂ is a lower alkyl group (C ₂ to _{C 4} ),
Indicates a butoxyethyl group or an alkali metal. Formula (1) - in which X is a chlorine atom or a methoxy group, R
represents a hydrogen atom, a lower alkyl group (C ₂ to C ₄ ), or an alkali metal. ) In the present invention, it is possible to obtain a herbicidal activity that far exceeds that of each single agent, but against Japanese grass, the harmful symptoms remain the same as those of compound (1) group alone, and the harmful symptoms are increased. Never. Therefore the compound
By adding compound (2) while keeping the dosage of group (1) at a level safe for lawns, weed control ability can be maximized. That is, a high degree of selectivity between grass and weeds can be obtained.
Furthermore, the present invention has improved fast-acting properties and rain resistance, and can be easily made into granules and fine granules that are easy to handle, further increasing its practical value. The effect of the present invention is that compound (1) group and compound (2) are 1:
A wide range of 10 to 10:1 is recognized, and appropriate compounds and mixing ratios can be selected depending on objectives such as weed species, spraying time, dosage form, and control cost. The treatment amount varies depending on the weed species to be controlled, the growth level, the dosage form used, and the compound, but compound (1) group as an active ingredient is 10g to 500g per 10a,
Compound (2) is 50g to 1000g, preferably 20g to 500g, and compound (2) is
If the amount exceeds 500g, the purpose is to use granules to control Porites sedges. When spraying, on-site mixed application can also be adopted, and
It can also be integrally formulated into wettable powders, emulsions, powders, fine granules, etc. Appropriate dosage forms can be selected depending on the situation of the application area, labor and cost, etc. In the case of a monolithic preparation, an inert organic solvent such as xylene, cyclohexanone, etc. can be used as the carrier. As the solid carrier, for example, clay, talc, bentonite, etc. can be used. Anionic or nonionic surfactants can be used as emulsifiers and dispersants. [Example] The present invention will be illustrated in more detail with reference to Examples below. Table 1 shows the structural formula, compound number, dosage form used in the test example, and active ingredient content of typical compounds of the present invention.

【table】

[Table] Formulation example 1 50% hydration powder of compound (2) 3 parts of white carbon and 7 parts of kaolin clay were added to 90 parts of compound (2), and the mixture was finely pulverized with a diet mill, resulting in a finely ground product of 55.6 Kaolin clay in the part
38.4 parts, 4 parts of Solpol 5039 (Toho Chemical Co., Ltd. - hereinafter referred to as Toho Chemical, registered trademark) as a dispersant, and 2 parts of Solpol 5050 were added and mixed well using a mixer to form compound (2). A 50% hydrating powder was obtained. (All parts indicate parts by weight. The same applies hereinafter.) Formulation example 2 50% emulsion of compound No. 1 30 parts of xylene and 10 parts of cyclohexanone were added to 50 parts of compound No. 1, and after stirring and dissolving, Solpol
10 parts of 800A (registered trademark of Toho Chemical) were added and dissolved with stirring to obtain a 50% emulsion of Compound No. 1. Formulation example 3 50% hydration powder of Compound No. 3 3 parts of white carbon and 16 parts of clay were added to 50 parts of Compound No. 3, crushed in a grinder, and the powdered surfactant Solpol 5039 was added to it. Part 4, Solpol
2 parts of 5050 (Toho Chemical registered trademark) and 25 parts of clay
of the mixture was added and mixed well to obtain a 50% hydrating powder of Compound No. 3. Formulation example 4 Compound No. 3 Compound (2) 25% 25% hydrating powder Compound (2) and compounds obtained in Formulation examples 1 and 3
Five parts of each of the 50% hydrating agents No. 3 were thoroughly mixed to obtain a hydrating agent containing 25% of Compound No. 3 and 25% of Compound (2). (This is referred to as Formulation No. 11). Formulation example 5 Compound No. 5 Compound (2) 3% 5% granules 10 parts of a 50% hydrating powder of compound (2), 60 parts of clay, and 26 parts of benite were mixed and transferred to a kneader to form compound No. 5. 6 parts of a 50% emulsion and 0.7 part of polyoxyethylene dodecyl ether were diluted with water and poured into a kneader. After kneading, it is put into a granulator with a 0.7mm screen, taken out and dried to form compound No.
Granules containing 3% of Compound (2) and 5% of Compound (2) were obtained. (This is referred to as formulation No. 12) Formulation example 6 Compound No. 8 Compound (2) 1% 5% granules 10 parts of 50% hydrating powder of compound (2), 60 parts of clay, and 29 parts of bentonite are inserted. Add 1 part of Compound No. 8 diluted with water, knead with a kneader, granulate with a granulator, dry, and make 1% of Compound No. 8.
Granules containing 5% of compound (2) and compound (2) were obtained. (This is referred to as Formulation No. 13) Formulation Example 7 Compound No. 6 Compound (2) 2% 2% Fine Granules Calcium carbonate fine particles and zeolite fine particles (48~
Carrier 92 with a 2:1 mixture of
of compound No. was placed in a speed kneader, and while stirring, compound No.
After slowly dropping 2 parts of 6, 1 part of polyoxyethylene dodecyl ether diluted with a small amount of water to reduce the viscosity was added dropwise, and then the compound
Add 4 parts of the 50% hydrating agent of (2) and code.Finally, add 1 part of white carbon, continue stirring for a while, take it out and air dry it.
% and 2% of compound (2) were obtained.
(This is referred to as Formulation No. 14) Test Example 1 Three plants each of plantain and dandelion were transplanted into a 200 cm ² clay pot filled with diluvial volcanic ash soil, and their growth was controlled. During the peak growth period after rooting, polyoxyethylene dodecyl ether was sprayed as a spreading agent to the specified diluted solutions of compound group (1) and compound (2) at a concentration.
Add to 300ppm (excluding emulsion), 100ppm
A sprayer was used to uniformly spray the liquid at a volume of 10A. Table 2 shows the results of observation and investigation one month after spraying. The evaluation criteria are as follows. 0: Same as no weed treatment or no harmful symptoms on grass 1: 10% control of weeds 10% control on grass 2: 20 weeds 20 on grass 5: 50 weeds 50 on grass 10: Complete control of weeds 〃 Shiba completely withers

【table】

[Table] Test Example 2 Stalk and foliage treatment test (mixing ratio, speed) Using plantain grown in the same manner as in Test Example 1, predetermined dilutions of Compound No. 1 and Compound (2) were sprayed alone and in combination, and the mixing ratio was determined. and the speed of drug efficacy. Table 3 shows the results of the investigation two weeks and one month after spraying. Evaluation was performed according to Test Example 1.

[Table] From the results of Tables 2 and 3, compound (1) group and compound (2)
It can be seen that by combining these two agents, a herbicidal activity that far exceeds that of each agent alone can be obtained. In addition, when mixing both,
It can be seen that the range of mixing ratios that can be used is wide, and that the drug's efficacy is quickly expressed. Test example 3 Field test (on-site mixed use) A test area of 1 4 m ² was set up in a grassy field with many weeds, and polyoxyethylene dodecyl ether was sprayed as a spreading agent to the specified dilution solution of each chemical at a concentration.
It was added at a concentration of 300 ppm and uniformly spread within the plot using a hand pressure sprayer at a liquid volume of 150/10a. Table 4 shows the results of an observational survey conducted one month after the spraying. The evaluation was performed by comparing each grass type with the untreated one, and the evaluation criteria were in accordance with Test Example 1. The weeding conditions during the treatment were as follows. Species name Area occupancy (%) Plant height (cm) White clover 10-30 15 Dandelion 5-20 5-20 Oxalis 5-10 5 Horsetail 10-20 15-25

[Table] From the results of Table 4, in the field test,
It can be seen that weed activity far exceeds the herbicidal activity of each single agent. Moreover, no signs of harm to Noshiba are observed. Test example 4 Field test (integrated formulation) A test area of 10 ^m2 was set up in a weed-rich area, and a liquid spray agent was tested using an integrated formulation of compound (1) group and compound (2). In the same manner as in Example 3, the granules and fine granules were evenly distributed in the area by hand. Table 5 shows the results of a survey conducted one month after spraying. The evaluation method was the same as in Test Example 3. The weeding status during treatment was as follows. Species name Occupied land within the ward (%) Plant height (cm) Chidomegusa 10-20 5 Dandelion 5-20 10-20 Plantain 5-20 5-10 Himekugu 5-10 10-20

【table】

〔Effect of the invention〕

Since the present invention is configured as explained above, it is possible to obtain herbicidal activity that far exceeds the herbicidal activity of each isolate from before emergence to the late stage of growth, and moreover, it does not cause any harmful symptoms to Japanese grass. It is as low as for single use. Therefore, it has a high degree of selectivity, allows a wide range of formulations to be applied, and is fast-acting, so it can eliminate broad-leaved, horsetail, and Cyperaceae perennial weeds that have been difficult to control in the past, and can have harmful effects on lawns. It can be controlled without giving any.

Claims (1)

[Claims] 1 Herbicidal active ingredient: General formula (1)- or (1)-
A herbicide containing a compound represented by formula (2) and a compound represented by formula (2). (Formula (1) - where A represents a carbon atom or a nitrogen atom, and when A is a carbon atom and X is a hydrogen atom, Y
is a chlorine atom, and if X is a chlorine atom or a methyl group, Y is a hydrogen atom. R ₁ represents a hydrogen atom or a methyl group, and R ₂ represents a lower alkyl group (C ₂ to C ₄ ), a butoxyethyl group, or an alkali metal. When A is a nitrogen atom, X and Y are chlorine atoms,
R ₁ is a hydrogen atom, R ₂ is a lower alkyl group (C ₂ to _{C 4} ),
Indicates a butoxyethyl group or an alkali metal. Formula (1) - in which X is a chlorine atom or a methoxy group, R
represents a hydrogen atom, a lower alkyl group (C ₂ to C ₄ ), or an alkali metal. )