JPS62161702A - Herbicide for paddy rice plant with reduced chemical madage - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a herbicide for paddy rice with reduced phytotoxicity. More specifically, by adding the compound of formula (2) to the compound of formula (1) below, the phytotoxic effect of the compound of formula (1) on paddy rice can be improved without impairing the excellent herbicidal efficacy of the compound of formula (1). The present invention relates to a herbicide for paddy rice that can be treated during a wide range of growing seasons in paddy rice cultivation and has reduced phytotoxicity, which is characterized by scale damage, by significantly reducing the effects of water damage.

therefore.

The present invention can be effectively used in the two-drug manufacturing industry and the agricultural and horticultural fields.

Formula (1) Compound 2-((4,6-simethoxypyrimicin-2-yl)aminocarbonyl-aminosulfonylmethyl)benzoic acid methyl ester Formula (2) Compound 1-(α,α-dimethylbenzyl)-3 -p-Tolylurea (2) Prior art The compound of formula (1), which is the active ingredient of the herbicide for paddy rice with reduced chemical damage of the present invention, is known as a herbicidal active ingredient in JP-A-57-112379. . Also, the formula (1
) It is also known that by mixing a thiol carbamate type or amide type herbicide with the compound, the chemical damage to paddy rice caused by the compound of Formula 1 (1) can be reduced, and it can be used as a composite herbicide for paddy rice. As an example, JP-A-59-82
Publication No. 306 [Formula (+) compound + 5-(4-chloropencyl) -N,N-diethyl thiol carbamate)
, JP-A-59-82307 (Formula (1) compound +s
-(i-methyl-1-phenethyl)-piperidine-1-
carbothioate), JP-A No. 60-42312 (
Formula (1) compound + 4-ethoxybenz-2', 3'
- Cycloanilite, compound of formula (1) + S-inpropyl-hexabitro IH-azepine-1-carbothioate, JP-A-60-42313 [compound of formula (1) + S-ethyl-N,N- hexamethylenethiol carbamate), JP-A-60-112703 (formula (
1) Compound+S-pencyl-N=ethyl-N-(1,2
-dimethyl)-propylthiol carbamate and the like.

On the other hand, it is also known that the compound of Formula 1 (2) is used as a herbicide for paddy rice, such as in "Pesticide Handbook" published by the Japan Plant Protection Association, 1981 edition, pages 261 to 262.

However, until now, it has not been known at all that the compound of formula (1) and the compound of formula (2) can be used together. ) There is no knowledge that the toxic effects of compounds can be reduced.

(v) Problems to be Solved by the Present Invention The compound of formula (1), which is the active ingredient of the present invention, can be used in the amount (
200 to 300 g/10 are), it has a very low chemical fit (5 to 7.5 g/10 are) - shows high herbicidal effect on older weeds and perennial weeds,
Applications within -108 often cause severe chemical damage;
Furthermore, even when applied between 11 and 15 days after transplanting, the present invention has the disadvantage of suppressing rice growth under high temperature conditions. The purpose is to provide a herbicide for paddy rice that reduces vine growth.

0) Structure of the Invention l) Means for Solving Problems In order to achieve the above object, the present inventors have intensively studied combinations of the compound of formula (+) and a large number of compounds. As a result, by adding the formula (2) compound to the formula (1) compound, the phytotoxicity of the formula (1) compound to paddy rice can be practically ignored without reducing the -8icidal efficacy of the formula (1) compound. We have found that this can be reduced to the extent possible.

When the compound of formula (2) is used alone or in combination with a weed killer other than the compound of formula (1), it only exhibits its inherent herbicide action. However, in the present invention, the formula (
2) When the compound is used in combination with the compound of formula (1), the chemical damage caused by the compound of formula (1) to the water species is reduced or completely eliminated.As a result, 1) the paddy rice with reduced chemical damage of the present invention; The herbicide is applicable to transplanted paddy rice cultivation and direct-seeded paddy rice cultivation, and does not cause chemical damage to paddy rice plants over a wide range of treatment periods. Shows excellent weeding effect on , Japanese cypress, and Japanese black porgy.

3)-4-Example (Method A of Formulation) The herbicide for paddy rice with reduced phytotoxicity of the present invention comprises a compound of formula (1) as an active ingredient and a compound of formula (2) as its phytotoxicity reducing agent.
) compound, various carriers, and various adjuvants, by a conventional method,
It can be used in formulations such as granules, wettable powders, emulsions, and flowables (sols). The carriers used include clay,
Solid carriers such as talc, bentonite, kaolin, silica, sucrose, etc., or benzene, xylene, toluene, kerosene, alcohols (methanol, etc.).

Liquid agents such as ethanol, impropatol, n-phthanol), and alcohols (acetone, methyl ethyl ketone, cyclohexanone, etc.) are used. These can be formulated with appropriate amounts of surfactants and other auxiliary agents, such as stabilizers and spreading agents, for use. The compounding ratio of the compound of formula (1) as an active ingredient in the herbicide for paddy rice with reduced phytotoxicity of the present invention and the compound of formula (2) as a phytotoxicity reducer is 1 part by weight of the compound of formula (1). On the other hand, it is appropriate to blend the compound of formula (2) in a proportion of 1 to 50 parts. However, the blending ratio can be changed as appropriate depending on the conditions at the time of use. In addition, other herbicides, fungicides, insecticides, plant 7A moderators, etc. can be mixed and used.

In addition, in order to reduce the phytotoxicity of water scavenging using the herbicide for paddy rice with reduced phytotoxicity according to the present invention, the compound of formula (1) and the compound of formula (2) should be combined in the range of 1 to 50, preferably 1 to 50, as described above. per 10 are, formula (1
) 2.5 to 15 g of the compound, 5 to 30 of the compound of formula (2)
The treatment time is preferably 1 to 150 days after transplanting paddy rice, or in the case of direct-seeded paddy rice, it is best applied to the water surface from the time of stem germination to the fourth stage.1Usually, granules, It is convenient to use wettable powders or emulsions.

In this way, by using the compound, it is possible to eliminate the chemical damage to paddy rice caused by the compound.

Next, examples of the present invention will be shown. In the examples, all parts are fffffi parts.

Example 1 (hydrating agent) 5 to 81 parts of formula (1) compound and 50 parts of formula (2) compound.

5 parts of polyoxyethylene alkylaryl ether, 3 parts of calcium lignin sulfonate, and 3 parts of diatomaceous powder are mixed and thoroughly ground to obtain a wettable powder.

Example 2 (granules) 0.25 parts of formula (1) compound, 1 part of formula (2) compound,
15 parts of water are added to 3 parts of calcium ligninsulfonate, 95.75 parts of talc, and a clay mixture, mixed in a kneader, granulated, and dried in a fluidized fluid dryer to obtain granules.

0.25 parts of the compound of the above formula (1), 10 parts of the compound of the formula (2), 10 parts of sodium Wi acid anhydride, 5 parts of calcium lignin sulfonate, 1 part of sodium alkylnaphthalene sulfonate , 73.75 parts of bentonite were mixed, pulverized in a hammer mill, 12 parts of water was added, kneaded in a mixer, granulated, and dried in a fluidized fluid dryer to obtain granules.

If the herbicide for paddy rice with reduced phytotoxicity of the present invention is used on the surface of the water from vkl to 15 days + 10 after transplanting paddy rice seedlings or from the time of germination to the 4-leaf stage of directly sown paddy rice, it will be surprisingly selective for paddy rice seedlings. The effect of reducing drug damage is achieved.

What is particularly noteworthy is that, as shown in the test examples below, when the compound of formula (1) is used alone within 1 to 10 days after transplanting paddy rice seedlings, or under high temperature conditions 1 to 11 days after transplanting paddy rice seedlings,
-If applied within 15 days, or if applied from the germination to the 4-leaf stage of directly sown paddy rice, significant chemical damage will occur to paddy rice; however, by adding a small amount of the compound of formula (2),
Even when applied within 1 to 15 days after transplanting paddy rice and from the time of germination to the 4tJ stage of directly sown paddy rice, the herbicidal effect of compound (1) is completely negligible, without decreasing the herbicidal effect. It can be reduced.

In addition, in the present invention, the compound of formula (2) used as a phytotoxicity reducer can sufficiently exhibit its original activity as a herbicide for water gates. Here, the compound of formula (2) and the compound of formula (2) differ in herbicidal activity and herbicidal spectrum.

By using them in combination, it is possible to expand the herbicidal spectrum and the application period.

Next, the usability of the herbicide for paddy rice with reduced phytotoxicity of the present invention will be explained using test examples.

In paddy fields of alluvial loam, plowing, watering,
After fertilizing and raking for the first generation, 1 section 16rn' (4m x 4m
) test plots were established. After that, seeds of Japanese millet, Japanese apricot, azalea, firefly seeds, water cypress, black croaker,
Mix Urikawa tubers into the soil and add 2.3ffi
Transplanting paddy rice seedlings (variety: Megiharu) and sowing germinated rice seeds (variety: Nihonbare) were carried out at the same time. Transplant 5 [1
Thereafter, granules prepared according to Example 2 were applied to the water surface.

35 days after application of the drug, a total of 4 r from 4 locations in the test area
Weeds remaining per rr' were extracted, their dry form was measured, and the weeding rate (%) was determined using the following formula.

In addition, phytotoxicity to transplanted paddy rice and directly sown paddy rice was determined by measuring the dryness of the rice, and the growth inhibition rate (%) for rice was determined according to the method for calculating the weeding rate (%), and expressed according to the following phytotoxicity standards.

Chemical damage, L: 'RI8 1(): 9+)% or more inhibition of growth 1'1 compared to untreated plot 9
: Less than 80-90% raw Yr suppression 8: No. 7 () ~ 80 No. 1 7: No. 60-70 No. 6: No. 15 () ~ 60 No. I 5.4 () ~ 50 No. 4: No. 0 ~4Qu]: No.120-30 horns 22+In~20 horns: No.11-10 nol O: No.1 Tsunokyu 7*1 plate 115,000 if the drug is applied on the 51st
Fill a Wagner pot with paddy soil,
Add wood and chemical fertilizer (N:P: = 17: 17:17
), and after plowing, paddy rice seedlings (variety Nihonbare) at the 2.5-nest stage were transplanted. The subsequent management was carried out in an artificial climate room, and the temperature conditions were 17°C at night and 27°C during the day, and on the 5th day after transplanting rice, a hydrating powder prepared according to Example 1 was used to make the specified medicinal product. The solution was diluted with water and treated dropwise. 21 days after the chemical treatment, the plant height, number of votes, and dry form of the leaves and roots were measured, and the ratio (%) to the untreated plot was determined.

In addition, in this test, 31i per drug concentration area! It was conducted under the L system. The results are shown in Table 2.Test Example 3
High temperature conditions, transplantation, 12 days of drug application Fill a 175,000 are Wagnerbot with paddy soil, add water, and add 3 g of chemical fertilizer (N:P: = 17:17:17)
After mixing and puddling, paddy rice seedlings at the 2.5 leaf stage (variety Nihonbare) were transplanted. Subsequent management was carried out in an artificial climate room. In other words, from day 1 to day 11 after transplanting paddy rice,
Managed under conditions of 7°C 1 day and 27°C, 12 days after transplanting paddy rice.
On Day 1, a hydrating powder prepared according to Example 1 was diluted with water to a predetermined dose, and the mixture was dropped. Thereafter, the plants were maintained under high-temperature conditions of 25°C at night and 35°C during day until the growth survey.

Then, on the 21st day after the chemical treatment, the plant height, number of votes, dry form of the stems, leaves, and roots were measured, and the ratio (%) to the untreated plot was determined. One test was conducted three times per drug concentration area. The results are shown in Table 3.

Claims (1)

[Claims] The compound represented by the following formula (1) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(1) The compound represented by the following formula (2) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(2) 1. A herbicide for paddy rice with reduced phytotoxicity, characterized in that the herbicide is made by adding a compound that is