JPS5857402B2 - Japanese porridge - Google Patents

Description

Detailed Description of the Invention The invention is based on 2,4-dichlorophenyl-3'-carbomethoxy 4'-nitrophenyl ether (compound (1)
) or 2,4,6-dolychlorphenyl-3'
--ty-honthoxy-4hoonidrophenyl ether (referred to as compound (2)) and 2,4-bis(ethylamine)-6-methylthio-1,3,5-triazine (referred to as compound part (3)). The present invention relates to a herbicidal composition containing the herbicidal composition as an active ingredient.

A feature of the herbicide according to the present invention is that, by mixing herbicides with different herbicidal activities, the herbicide has recently spread explosively and is extremely difficult to kill, making control measures a serious issue in various places. It exhibits an extremely high synergistic herbicidal effect against the perennial weed Prunus japonicum.

Conventionally, 2,4-dichlorophenoxyacetic acid, pentachlorophenol, 2,4-dichlorobenzonitrile, 2,4
-bis(isopropylamine)-6-methylthiote 3
・5-triazine, 2,4-dichlorophenyl-41-
New herbicides for paddy fields such as nitrophenyl nitrile, 2,4,6-dolychlorophenyl 4'-nitrophenyl ether, and S/<di-chlorobenzyl-N-N-diethylthiol carbamate. has been developed and widely used.

Nowadays, the use of herbicides that are highly toxic, toxic to fish, and highly toxic to plants has been severely restricted, and safe alternative herbicides such as barnyard grass,
Herbicides with extremely high herbicidal activity against weeds such as pine beetle are being developed one after another, and the use of herbicides is making a truly significant contribution in times of agricultural labor shortages.

However, existing herbicides have almost no herbicidal activity against the perennial weed, which has recently become a problem in many areas, and when other weeds are removed, mutual competitive effects are eliminated. Urikawa spreads and flourishes explosively.

Urikawa germinates in early spring, sends out underground stems, and multiplies.
The number of overwintering tubers that year grows from one in the spring to about 750 by the end of autumn, and the number of tubers the following year increases to 550,000.

Tubers tend to float when paddy fields are filled with water and plowed in the spring, and if one tuber invades in early spring, if growing conditions are good, there will be more than 400 million tubers in three years.

Since interest in Kurikawa arose in Setouchi a few years ago,
Nowadays, it has invaded most prefectures throughout Japan and is causing serious damage to rice crops and is rapidly growing, so it is extremely effective not only for controlling weeds such as Japanese barnyard grass and Japanese grasshopper, but also for weeds such as Japanese grasshopper. There is an urgent need and strong demand for the development of drugs that can control these diseases.

. The present inventors have discovered that the purpose of developing a drug that has an accurate herbicidal effect on the hard-to-kill weed, is harmless to fish and shellfish, and has no chemical damage to crops. Many compounds were tested.

As a result, compound (1) or compound (2) and compound (
3) The herbicidal composition containing as an active ingredient has extremely high herbicidal activity against paddy field grass, and the two types of chemicals mutually increase the herbicidal efficacy and exhibit a synergistic herbicidal efficacy. The present invention has been completed.

Compound (1) or compound (2) is an excellent herbicide for rice that has an extremely high herbicidal effect on the grass weed Grass grasshopper and most annual broad-leaved weeds before and after emergence, and has little chemical damage to transplanted rice. .

In addition, high herbicidal properties have been observed when the chemical is applied before the emergence of the perennial weed lily.

However, when a dose of the drug is used to completely control the paddy field in practical terms, there are problems such as phytotoxicity to paddy rice.

Compound (3) is also known to have extremely high herbicidal efficacy against annual weeds of paddy rice.

Furthermore, although some herbicidal activity has been observed in the perennial weed Prunus elegans, it is extremely difficult to control it with a single agent in practical terms.

Furthermore, in reality, a large amount of green grass is observed in rice fields to which compound (3) has been applied.

The herbicidal composition of the present invention contains the compound vA1 as an active ingredient.
), or by applying a mixture of compound (2) and compound (3), it is possible to not only exhibit high herbicidal efficacy against grasshoppers, Japanese azalea, Japanese millet, and Japanese grassweed, but also especially against weeds such as Japanese grasshopper, which has been difficult to weed in the past. It has a synergistic herbicidal effect that could not be expected with conventional drugs.

This fact in the present invention is a completely new finding.

The blending ratio of the active ingredients used in the present invention is 1 part by weight (hereinafter referred to as parts), and 1 part to 1 part of compound (3) is blended to 1 part of compound 1) or compound (2). The proportion is more than half, but it can be made to be more than half if necessary.

Furthermore, it goes without saying that it can be applied in combination with other herbicides.
If used in combination with fungicides, insecticides, plant regulators, fertilizers, etc., it can be used as a more labor-saving pest control agent.

The above-mentioned formulation can be mixed with various carriers to form a formulation commonly used in agricultural chemicals, such as emulsions, granules, and wettable powders.

As carriers used for this purpose, commonly used carriers are used, such as solid carriers such as talc, clay, and bentonite, and liquid carriers such as alcohols, benzene, xylene, acetone, and solvent naphtha.

Furthermore, various auxiliary agents such as a spreading agent, an emulsifier, a wetting agent, and a fixing agent can be added as necessary.

Next, some examples of the herbicide composition of the present invention will be shown, but the present invention is not limited to the following examples.

Example 1 Granules 10 parts of compound u), 5 parts of compound (3), 5 parts of bentonite, 2 parts of sodium dodecylbenzenesulfonate and 78 parts of clay are mixed and granules are obtained using a granulator.

□Example 2 Granule compound (2) 7 parts, compound (3) 3 parts, bentonite
10 parts of sodium dodecylbenzenesulfonate and 78 parts of clay were mixed to obtain granules using a granulator.

Example 3 Emulsion compound (2) 18 parts, compound (3) 6 parts, xylene 31
38 parts of acetone and 7 parts of polyoxyethylene nonylphenyl ether are uniformly mixed to obtain an emulsion.

Next, the usefulness of the inventive herbicide composition will be specifically explained using test examples.

Test Example 1 As a test method for testing the control effect on P. elegans, alluvial clay paddy soil was filled in a Wagner pot with a size of 1/5000 are, and 10 P. elegans tubers per pot were transplanted to the surface layer of the pot. The aqueous level was kept at 3 crI'L.

Thereafter, a predetermined amount of the test chemical prepared according to Example 3 was added dropwise immediately before the appearance of scorch.

This test was conducted using a three-pot system at one concentration.

The survey was conducted on the dry weight of surviving weeds on the 30th day after chemical treatment (
The weeding rate (%) was determined using the following formula.

Furthermore, among the active ingredients of the herbicide composition of the present invention, diphenyl ether compound 1) or (2) is replaced with S-parachlorobenzyl-N-N-diethylthiol carbamate (commercially available herbicide: compound A). Comparative drug ■ [Compound 10 compounds 3], 2,4-dichlorophenyl-3
Comparative drug substituted with '-methoxy-4'-nitrophenyl ether (compound B) ■ [Compound B 10 compounds (3)]
and 2,4,6-dolychlorphenyl ether 4'
Comparative drug (1) [Compound C 10 Compound Track 3] was tested in the same manner as above except that -nitrophenyl ether (Compound C) was substituted.

The results are shown in Table 1.

Test Example 2 Post-transplant treatment test of paddy rice As a test method, a test plot with an area of 10 m2 was created in a paddy field, and a fixed number of grains (100 grains) was set in the test plot.
During puddling, a certain amount of the seeds of Japanese porphyry, Japanese cabbage, and pine nuts were mixed and sown on the soil surface during puddling.

After rice planting while maintaining the flooding method at 3 crrL, on the 7th day, granules of the test drug were prepared according to Example 1 and dispersed.

In the investigation, weeds that survived 300 days after the chemical treatment were pulled out and their dry weight was measured.

The results are shown in Table 2.

Claims (1)

[Claims] 12,4-dichlorophenyl-31-carbomethoxy-4'-nitrophenyl ether or 2,4,6-dolychlorophenyl-3'-carbotoxy-4'-nitrophenyl ether and 2,4-bis( ethylamino)-6
-Methylthio-1,3,5-triazine as an active ingredient.