JPS5879908A - Mixed herbicide - Google Patents

Abstract

PURPOSE:To provide a mixed herbicide containing 3-[2-nitro-5-(2-chloro-4-trifluoromethylphenoxy)-phenoxy]-tetrahydrofuran and S-ethyl-N,N-hexamethylenethiolcarbamate, etc. CONSTITUTION:The objective herbicide can be obtained by mixing 3-[2-nitro-5- (2-chloro-4-trifluoromethylphenoxy)-phenoxy]-tetrahydrofuran with S-ethyl-N,N- hexamethylenethiolcarbamate or S-(4-chlorobenzyl)-N,N-diethylthiolcarbamate at a weight ratio of 1:1-10. The mixed herbicide exhibits remarkable herbicidal effect as herbicide for paddy rice field not only to gramineous weeds and annual weeds but also perennial weeds such as arrowhead, bulrush, flatstage, etc. Preferable rate of application is 30-300g/a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides 6-[2-nitro-5-(2-chloro/l/-
4-) IJ fluoromethylphenoxy)-phenoxy]-tetrahydrofuran (hereinafter referred to as "Compound A")
and S-ethyl-N,N-hexamethylenethiol carbamate (hereinafter referred to as "Compound B") and S-(4
-chlorobenzyl) -N,N-diethylthiol carbamate (hereinafter referred to as "compound 0").

It has been disclosed that it has a herbicidal effect on firefly, yellowtail moss, Japanese cypress, etc., and when applied to fields, it has a herbicidal effect on seaweed, foxtail grass, blueberry, white locust, etc. .

However, depending on the test conditions, Compound A may not show any weed-killing effect. Compound B is widely used in rice fields under the part name Audran (common name Molinate). The herbicidal spectrum is extremely narrow, and it exhibits a herbicidal effect specifically against wildflowers.

Compound C is Compound 1, which is mainly used in Water 1-1-1 under the trade names Saturn and Volley (generic name Benthiocarb), but it is also used in some broad-leaved weeds and weeds of Cyperus japonica. However, although its activity is sufficient, it mainly shows a 4k effect on wild animals.

It is a well-known fact that these 11', compounds 13 and 0, 14 GJ, are known agents, and that compounds 13 and 0 alone are insufficient as herbicides. It is.

We believe that a more complete exclusion? , ``As a result of repeated research on the +ill formulation of L agent, compound A and compound O
Hp or compound A and compound 00 combination is fl'! The present invention was completed by discovering that each compound produces excellent properties that could not be expected from the single use of each compound.

In other words, the mixed herbicide of the present invention is effective as a herbicide for paddy fields, not only against gramineous grasses and annual weeds, but also against perennial weeds that have become a big problem in recent years, such as weeds, fireflies, and cypress. It shows a herbicidal effect.

These effects were completely unexpected from the herbicidal spectrum of each single agent.

Furthermore, it is also effective to add other herbicides for the purpose of enhancing the herbicidal effect of the mixed herbicide of the present invention and expanding the suitable treatment period 1].

The mixed herbicide of the present invention can be mixed in a wide range of dry IM ratios in order to fully exhibit its mixed effect, but preferably Compound A and Compound B or O can be mixed at a ratio of 1 to 10 (1/1/2/1/2/1/2/2/2/2/2019). It is preferable to mix at a ratio of (ratio).

The amount of active ingredient when applied in water 1] depends on weather conditions, soil type, formulation form, application timing, application method 2. The amount to be applied as a mixture is preferably 10 to 500, preferably 60 to 500, although it varies depending on the location of D.

In the mixed herbicide of the present invention, Compound 13 or Compound A and Compound O may be used in combination, but usually they are mixed with each carrier or diluted 6j, and in some cases, an adjuvant is added. Even better results can be obtained if the compound is processed into a formulation such as granules, powder, emulsion, or wettable powder by a conventional method.

As carriers or diluents, commonly used solids or liquid powders are used. Examples of solid carriers include talc, bentonite, lysine, chikara, yusun, quince, and white. carbon, vermiculite,
Slaked lime, silica sand, I1lii Qt-11,1 (plain etc. or a mixture thereof, as a liquid carrier, alcohol,
Mixtures of dioxane, acetone, cyclohegisanone, methylnaphthalene, dimethylformamide, etc., 11 in 1. As adjuvants, surfactants such as argyl sulfate, argyl sulfonic acid black crystals, polyoxyethylene glycol ether polyoxyethylene alkylaryl ether, polyoxyethylene sorbitan monoalkylate, etc., and carpolysil methyl cellulose are used as adjuvants. , Algin i￥! Various auxiliary agents such as Noda, polyvinyl alcohol, and gum arabic are used.

The mixed herbicide of the present invention will be explained in detail below with reference to Examples (formulation examples and test examples).

All test compounds are indicated by the above abbreviations. Note that "part 1 in the formulation example" refers to the heavy wall percent.

Formulation Example 1 10 parts of compound A, 835 parts of compound, 1 part of white carbon
0 parts, 40 parts of cane earth, 6 parts of sodium lignin sulfonate
1 part, 2 parts of sodium dodecylbenzenesulfonate +9
・Mixed to obtain a wettable powder.

1 and 241 Example 2 20 parts of Compound A, 30 parts of Compound 0, 10 parts of emulsifier Tsurupol 3558 (11 product names: manufactured by Toho Katei Co., Ltd.) and 40 parts of xylene were mixed to obtain an emulsion.

Formulation Example 3 Compound A 2 parts, Compound 13 7 parts, polyethylene glycol nonylphenyl ether 1 part, bentonite 20
1 part and 70 parts of clay were pulverized, mixed with water, stirred, kneaded, and then granulated and dried to obtain a powder.

Formulation Example 4 1.5 parts of Compound A, 1 part of sodium ligninsulfonate, 60 parts of bentonite and 325 parts of Merck were ground and mixed,
After adding water and kneading well, granulate and dry to obtain compound IA.
granules were prepared. 7. Mixed granules were obtained by adding 05 parts of the compound to this 1☆ agent at m-IQ υ゛.

Formulation Example 5 2 parts of Compound Δ, 135 parts of Compound 135, 1 part of sodium ligninsulfonate, and 92 parts of clay were ground and mixed to obtain a powder.

Test Example 1 In a 115.0007-ru 1-no-danel bottle, tubers of 41 m long of Jukou Dairyu, ``Bayoshime Tainubi'' and ``Hotarui'' were sown, and tubers of ``Japanese cypress'' and ``Urikawa'' were planted and submerged in water. Paddy rice vinegar (2,5) that had been sterilized in advance
5 leaf stage) Transplant 2 plants, grow outdoors, and grow at 7 days after transplanting to the water surface.
At the time of 05 leaves of Japanese millet millet ``υ'', a predetermined fi' of the test compound was treated using 1 granule prepared according to the method described in Formulation Example B.

After that, it was grown outdoors and treated with chemicals for 25 hours.
The effect of pasture on rice and the degree of sputum damage to paddy rice were investigated.

The results are shown in Table 1.

In this table, the degree of chemical damage to crops and the herbicidal effect on weeds are expressed by comparing the emergence or growth of crops or weeds with the air-dried type in the untreated plot, according to the evaluation criteria below.

The test compounds were indicated by the abbreviations listed above, and compounds A, B, and 0 were indicated as A, B, and 0, respectively.

Evaluation Criteria 10 Survival rate expressed as air-dry weight ratio in Karikun treatment area 0-4 (%
)9
5-148
15-247
25～
546
35-445
45-544
55-643

65-742
75-841
85-940

95-100 Table 1 Patent Applicant Mitsui Toatsu Chemical Co., Ltd.

Claims (3)

[Claims] (1) 3-(2-2L-Rho-5-(2-chloro-4-trifluoromethylphenoxy)-phenoxy]-tetrahydrofuran and S-ethyl-N, N-hexamethylenethiol carbamate or 5-(4 -chlorobenzyl)-NIN-diethylthiol carbamate. (2) 3-(2-nitro-5-(2-chloro-4-
Claims in the Japanese Patent Claims include a mixture of trifluoromethylphenoxy)-phenoxy]-tetmhydrofuran and S-ethyl-N,N-hexaramethylenethiol carbamate in a ratio of 1:1 to 10 (weight ratio) The mixed herbicide according to paragraph 1. (3) Lo-[2-nitro-5-(2-chloro-4-trifluoromethylphenoquine)-phenoxy]-tetrahydrofuranth-5-(4-10 rubenzyl)-N,N-diethylthiolcarbamatetra 1= The mixed herbicide according to claim 1, which is obtained by mixing the herbicides in a ratio of 1 to 10 (weight ratio).