JPS6045507A - Herbicide composition - Google Patents

Abstract

PURPOSE:A herbicide composition having no phytotoxicity to paddy rice plants, controlling Echinochloa crus-galli Beauv. var. praticola Ohwi. with a small amount of it, obtained by blending a specific pyrazolesulfonylurea derivative with one of NTN801, HW-52, butachlor, and pretilacrol. CONSTITUTION:A herbicidal composition comprising a pyrazolesulfonylurea derivative shown by the formula (A is lower alkyl; B is H, or lower alkyl; R is lower alkyl; X and Y are lower alkyl, or lower alkoxy) and one of 2-benzothiazol-2-yloxy-N-methylacetanilide (NTN801 for short), 4-ethoxy-methoxy-benz-2', 3'-dichloroanilide (HW-52 for short), N-butoxymethyl-2,6-diethyl-alpha-chloroacetanilide (butachlor for short), and 2-chloro-2',6'-diethyl-N-(n-propoxyethyl)acetanilide (pretilacrol for short) as active ingredients.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula (■): [In the formula, a lower alkyl group is shown. B represents a hydrogen atom or a lower alkyl group. R represents a lower alkyl group. X
and Y each independently represent a lower alkyl group or a lower alkoxy group. ] A pyrazolesulfonylurea derivative represented by
(hereinafter referred to as HW-52), N~butoxymethyl-2,
6-diethyl-α-chloroacetanilide (hereinafter referred to as butachlor) or 2-chloro-2'6''-diethyl-N-(n~propoxyethyl)acetanilide (hereinafter referred to as pretilachlor). The present invention relates to a herbicidal composition containing the present invention as an ingredient.

As a result of many years of research and development into herbicides, a wide variety of herbicides have been put into practical use, and these herbicides have contributed to labor-saving weed control operations and improved productivity of agricultural and horticultural crops. Even today, there is a demand for the development of new chemicals with better herbicidal properties, and in particular, as herbicides for agriculture and horticulture, they are used to selectively control only target weeds at low doses without causing harm to cultivated crops. However, existing drugs do not necessarily meet this requirement.

The compound represented by the general formula (1) exhibits excellent herbicidal effects at lower dosages than conventional herbicides, and has high safety against rice. Moreover, it is highly effective not only against -year-old grass weeds and -year-old broad-leaved weeds, but also against perennial weeds, making it highly useful.

Also, the conventionally known NTN801, HW-52
General formula (1) is used for Noviae, butachlor or pretilachlor is used for Noviae, - an annual weed, and Bokurui.
Although it has been used in higher doses than the compounds represented by
As a result, perennial weeds that are difficult to control with these chemicals have increased, and improvements are desired.

The present inventor conducted research to increase the herbicidal effect of the compound represented by the general formula ('I), and found that the compound represented by the general formula ('I)
) and the conventionally used herbicides, the inventors discovered that not only the respective herbicidal effects were merely additive, but also a synergistic herbicidal effect appeared, and the present invention was completed. did.

This synergistic effect is great, and the composition of the present invention does not cause any phytotoxicity to rice, and it is possible to completely control wild weeds, annual weeds, and perennial weeds at a low dose, and the usefulness of the present invention is extremely large. . In addition, the synergistic effect of the herbicidal effect on barnyard grass is particularly remarkable, and by the above-mentioned mixed application, it is possible to reduce the amount of the conventionally used herbicides contained in the composition of the present invention, making it extremely useful. expensive.

Furthermore, the herbicidal composition of the present invention is effective even when treated before and after weed germination, and is highly effective when treated with soil or with both foliage and soil. It is also useful for various grains other than rice, and can also be used to control various weeds in agricultural and horticultural fields such as fields and orchards, as well as in non-agricultural areas such as playgrounds, vacant lots, forest areas, tank yards, and railway edges. Can be used,
Shows great economic effect in weed control.

The composition according to the present invention generally contains a compound o, ooi to 50% of the compound represented by the general formula (1) per 1 part by weight of NTN801, HW-52, butachlor or brennaraclor, although it depends on the relative activity of each component. parts by weight, preferably 0.0
It contains 01 to 10 parts by weight.

In many cases, the greatest advantage of the combined herbicide of the present invention is that the formula (1
) is relatively lower than other herbicides, for example, when the proportion of the compound represented by formula (I) is 0.001 to 0.1 part by weight per 1 part by weight of other herbicides. sometimes obtained.

The amount of mixture to be applied will depend on a number of factors, such as the specific target plant species to be inhibited, but generally amounts of 0.001 to 10) [g/ha are usually suitable. . Those skilled in the art can readily determine appropriate usage rates by routine, standardized tests without the need for extensive experimentation.

The compositions of the invention are preferably used in the form of a composition in which the active ingredient is mixed with a carrier consisting of a solid or liquid diluent. Preferably, the composition further comprises a surfactant.

Next, Table 1 shows representative examples of the compound represented by the general formula (1) in the present invention. Although the following compounds are included in the compounds represented by the general formula (I), they are also included in the compounds represented by the general formula (I).
The compounds represented by 1) are not limited to these.

Table 1 in the margin below Me: Methyl group Et: Ethyl group Individual active compounds often exhibit drawbacks in their herbicidal activity, but in such cases, the herbicidal activity when two types of active compounds are combined is When the activity of two compounds is greater than the simple sum of their respective activities (expected activity), this is called synergism. The expected activity of a particular combination of two herbicides can be calculated as follows.

(Colby S, R, Calculation of synergistic and antagonistic responses of herbicide combinations rWeedJ vol. 15, pp. 20-22, 1
967) α: Inhibition rate when herbicide A is treated at a Kg/ha amount β: Suppression rate when herbicide B is treated at a Kg/haO amount E: Herbicide A is aKg/ha ha, herbicide B bKg/ha
If the expected inhibition rate, that is, the actual inhibition rate when treated with the above amount, is greater than the above calculation, it can be said that the combined activity exhibits a synergistic effect.

Hereinafter, the present invention will be explained in more detail with reference to Examples.
The compounds, formulation amounts, array types, etc. in the present invention are not limited to the examples.

In addition, all "parts" mean parts by weight.

n Gold box granule compound inhibitor 2 ------111-0, 1 part HW-52-
−−−−7 parts bentonite −−−−−−・−・・−50 parts talc −−m−−−・−, 42. Mix and crush 9 parts or more evenly, then add a small amount of water. The mixture is then stirred and kneaded, granulated using an extrusion granulator, and dried to form granules.

1 row of rows of grains 5 = -------0, 05 parts NTN801
−−−−−−−−−− Three parts bentonite −−−−−
-----------50 parts talc -----------46,
At least 95 parts are uniformly mixed and pulverized, then a small amount of water is added, stirred and kneaded, granulated using an extrusion granulator, and dried to form granules.

Column H Row J - Granule Compound N [L6 ------- 0.1 part Butachlor - 3,5 parts Bentonite ----
−−−−−−25 parts talc −−−−−−−・−= 7
1.4 parts or more are uniformly mixed and pulverized, then a small amount of water is added, stirred and kneaded, granulated using an extrusion granulator, and dried to form granules.

Kaishoku Co., Ltd. Granule Compound Moving Tooth 8 ---------0, 05 parts Pretilachlor ---1,5 parts Bentonite ---
−−−−−−−−2.5 parts talc −−−−−−”−73
, 45 parts or more are uniformly mixed and pulverized, then a small amount of water is added, stirred and kneaded, granulated using an extrusion type granulator, and dried to form granules.

Discretion plate l Hydrating agent compound moving tooth 7 ----------0.3 parts HW -52-------40 Zikryte A---- --------- 55.7 parts (kaolin clay: Zikrite Industries trade name) Tsurupol 5039 ------ 2 parts (nonionic surfactant and anionic interface) Mixture with activator: Toho Chemical (trade name) Carplex (anti-caking agent) - 2 parts or more (white carbon: Shionogi & Co., Ltd. trade name) are uniformly mixed and pulverized to make a wettable powder.

Weeding effect test under flooded conditions 115000
After putting alluvial soil into Earl's Wagner Posoto, water is added and mixed to create freshwater conditions at a depth of 2 cm. Seeds of Japanese grasshopper, broad-leaved weeds (Japanese chinensis, azalea, and Kikashigusa) were mixedly sown in the above-mentioned pots, and tubers of Japanese cypress, Japanese cypress, and black bream were also placed in the beds. Furthermore, rice seedlings at the 2.5 leaf stage were transplanted. 25-3 bots
Plants were grown in a greenhouse at 0° C., and 10 days after sowing, at the 1.5-leaf stage, a diluted drug solution was dropped onto the water surface using a volumetric pipette at a predetermined dose.

Three weeks after dropping the chemical solution, the herbicidal effect on various weeds was investigated according to the following criteria.

The results are shown in Tables 2 and 3.

Judgment Criteria 5 Weed killing rate 90% or more (almost complete death) 4- Weed killing rate 70-89% 3- Weed killing rate 40-69% 2- Weed killing rate 20-39% 1- Weed killing rate 5-19% 〇 - Weed killing rate 5% or less (almost ineffective) However, the above weed killing rate was determined by measuring the above-ground grass weight in the chemical-treated area and the above-ground grass weight in the untreated area using the following formula. It is something.

Table 2 Table 2 (Continued) Margin below Table 3 Mixed herbicidal effect test (herbicide rate 2%) Synergistic effect test on barnyard millet A polyethylene pot with an inner diameter of 8 cm was filled with paddy soil, and rice fields were grown in the paddy field. were grown, and the flooded soil was treated with each prescribed drug formulated into granules during the three-leaf stage of barnyard grass. The pots are placed in a greenhouse at 25-30°C for controlled cultivation, and after treatment 3
The above-ground grass weight of the barnyard grass remaining on day 0 and the above-ground grass weight of the untreated area were measured, and the weed killing rate was calculated and judged according to the following criteria. The results are shown in Tables 4 and 5.

Ratings Table 4 Weed Killing Rate Table 4 (Continued) Table 5 Mixed Herbicidal Effect Test (Weed Kill Rate 1%) Table 5 (Continued) In the table, the calculated values show the expected values calculated from the Co1by formula.

As is clear from the above table, the composition of the present invention does not simply combine the activities of the compound represented by general formula (1) and conventionally known herbicides, but also exhibits greater synergistic herbicidal activity. Furthermore, target weeds can be selectively and completely controlled with a low dosage.

Patent applicant: Nissan Chemical Industries, Ltd.

Claims (1)

[Claims] General formula (I): [In the formula, a lower alkyl group is shown. B represents a hydrogen atom or a lower alkyl group. R represents a lower alkyl group. X
and Y each independently represent a lower alkyl group or a lower alkoxy group. ] Pyrazolesulfonylurea derivative represented by and 2-hendithiazol-2-yloxy-N-methylacetanilide, 4-ethoxymethoxyhenz-2',3'
-dichloroanilide, N-butoxymethyl-2,6-
Diethyl-α-chloroacetanilide or 2-chloro-2'6”-diethyl-N-(n-propoxyethyl)
1. A herbicidal composition comprising one type of acetanilide as an active ingredient.