JPS6025403B2 - herbicidal composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides S-isopropylhequinohydro IH-azepine-1-carbothioate (hereinafter referred to as "R-4574").
) and 5-te9. A mixture of -butyl-3-(2,4-dichloro-5-isoproboxyphenyl)1,3,4-oxadiazolin-2-one (hereinafter abbreviated as "oxadiazone") is treated before rice transplantation. The present invention relates to a herbicidal composition, and is particularly intended to treat and control various weeds occurring in rice fields before transplanting rice, providing a herbicide with a wide range of applications and high practical value.

In addition, R-4754 can be used for soil mixing before field preparation and water seedling, or after sowing, and can also be used for direct sowing in dry fields,
In both flooded and transplanted paddy fields, ± soil mixing treatment, post-sowing treatment, and treatment during the growing season are possible, and there is no harm to the germination or growth of rice, and it is effective against most of the pongee-leaf weeds such as grasshopper and cyperus. This is a weed control agent for paddy rice that can prevent the germination and growth of rice. However, it has no effect at all on suppressing the germination and growth of broad-leaved weeds such as weed grass, azalea, azalea, and water chickweed. That is, R
Weed control using -4574 was effective only in paddy fields dominated by pongee weeds, but completely ineffective in paddy fields dominated by broadleaf weeds. Oxadiazone, on the other hand, is a chemical that is used during puddling of rice fields, and it strongly suppresses the germination and growth of annual weeds, but when treated with the usual dosage of 6M/IQ, the herbicidal effect may vary depending on the nature of the soil in the treated rice fields. It is an unstable drug as it may deteriorate or cause severe drug damage. Therefore, it was necessary to reduce the dosage and stabilize the herbicidal effect. In addition, oxadiazon has a weed growth suppressing effect, contrary to R-47, which is particularly strong against broad-leaved annual weeds, but has the disadvantage that it is weak against weeds of the Poaceae family, such as grass weeds, and weeds that have grown to a certain extent. . That is, R-4754 is used for grain weeds, weeds in the growing period after germination, and perennial weeds, but R-47 is used for broad-leaved weeds before germination and in the very early stages of germination. It has a suppressive power superior to that of rats and is promising as a herbicide, but when used alone, it has the disadvantage of being limited in terms of the appropriate period of use and the amount of dosage that can be applied from the viewpoint of safety against applicable weeds and rice. The inventors
As a result of various studies to compensate for these shortcomings, R-4
It has been found that by treating rice with 754 and oxadiazone before transplanting rice or during puddling work, it does not harm rice at all and has an excellent herbicidal effect.

In other words, due to the additive effect, it showed a strong growth suppressing effect on grass family weeds, broad-leaved annual weeds, perennial weeds, and weeds that were in the growing season at the time of plowing. A synergistic effect was also observed. In other words, these compounds have significantly greater weed growth suppressing power than when acting alone, and can inhibit all kinds of weeds or weeds that have grown to some extent, such as 2- to 3-leaf stages that were still alive during puddling. It exhibits a strong and stable herbicidal effect on grasshoppers without causing any harm to the grass. The present invention relates to a herbicidal composition in which R-4754 is mixed with oxadiazone and treated before transplanting to rice, and its performance as a herbicide is significantly improved due to the synergistic effect based on the combination of active ingredients. Moreover,
Furthermore, no chemical damage will occur due to treatment with this drug before rice transplantation. R-4754 and oxadiazone, which belong to the thiocarbamate family, are the three most active herbicides, but the synergistic effect of the herbicides when these are combined and treated before rice transplantation is new. Next, the effects of the present invention will be explained in detail by showing experimental examples when applied to paddy fields. Experimental Example 1 One rice field wiping test plot was divided into 10 sections, and the following test was conducted with three repetitions per test plot.

At the same time, paddy fields (wooden loam) where weeds grow uniformly were plowed, and at the same time, granules were prepared using the formulation method shown in Example 1 below.
R-475 Fuoxadiazone alone was formulated in the same manner, and the amount was increased with bentonite to maintain a constant concentration of the active ingredient in the composition.

) was uniformly mixed with soil. 2.5~ after treatment
The conditions were set to 3 arcs of water, and 2 days later, 2.5-season rice flutes were transplanted and cultivated in the usual manner. To investigate the effectiveness, the number of living weeds was measured 30 days after the chemical treatment, and at the same time, the chemical damage to rice was also observed. The results are shown in Table 1. 1st
Table Experimental Example 2 and Experimental Example 3 are shown to explain in more detail the synergistic efficacy of the herbicidal composition according to the present invention.

Practical Example 2 This experiment shows the synergistic herbicidal efficacy of a mixture of R-4754 and oxadiazone against azaena and selectivity against rice under conditions of soil mixing at the time of rice transplantation. It is something.

Fill a 1'2,000 are Wagner pot with rice paddy bush soil (coffin soil), sow 5 vertical seeds of /bie seeds on the surface, fill with fallow paddy surface soil containing a large amount of azaena seeds, and then plow at a water depth of 2. At the same time, a wettable powder was prepared using the formulation method shown in Example 2 below (R-4754, oxadiazone alone was also formulated in the same way, and the concentration of the active ingredient in the composition was kept constant by increasing or decreasing the amount of clay. I made it.

) was mixed uniformly into the soil. After the treatment, the rice plants were flooded at 2.5 to 3 arcs, and 3 days later, the rice plants at the 4-leaf stage were transplanted to the center of the pot and cultivated in a greenhouse of 20 to 3,000 yen according to the usual method. To investigate the effect, the fresh weight of surviving weeds was measured 30 days after the chemical treatment, and at the same time, the chemical damage to rice was observed. The results are shown in Table 2. Table 2 Experimental Example 3 This experiment investigated the synergistic herbicidal efficacy of an admixture of R-4754 and oxadiazone against perennial weeds IJ, firefly, and black croaker under conditions of soil admixture at the time of plowing before transplanting rice. This indicates selectivity.

Fill a 1/2000 are Wagner pot with paddy soil (sandy loam), sow the germinating seeds of fireflies on the surface, then bury the tubers of Mizugari and blackeye in solid increments, then plow at a depth of 1 inch, and at the same time. Example 3 below
(R-4754 and oxadiazone alone were formulated in the same way, and the concentration of the active ingredient in the composition was kept constant by increasing or decreasing xylene.) The emulsion was uniformly applied to the soil using the formulation method shown in . Mixed. After the treatment, the water conditions were set to 2.5 to 3 ml, and 4 days later, the 2.9 garden period rice plants were transplanted to the center of the pot and cultivated in a 20 to 3 ml greenhouse using the usual method. To investigate the effectiveness, the living weeds were measured 30 days after the chemical treatment, and at the same time, the chemical damage to rice was observed. The results are shown in Table 3. Table 3 The blending ratio of the active ingredients contained in the herbicidal composition of the present invention is not particularly limited and can be blended in any ratio depending on the purpose.

The herbicide of the present invention can be produced by mixing R-4754 with a predetermined oxadiazone in advance and, if necessary, forming the mixture into conventional formulations such as wettable powders, emulsions, powders, and granules.

Alternatively, the herbicide of the present invention can be prepared by mixing R-4754 and oxadiazone in appropriate proportions at the time of use. For formulation, any commonly used carrier may be used, such as viscous, kaolin, talc, bentonite, lenite, water, xylene, alcohol, acetone, benzene, and the like.

Furthermore, auxiliary agents such as dispersants, diluents, emulsifiers, penetrants, and binders may be added to the drug. Furthermore, depending on the purpose of use, the above-mentioned fermentation component can be used in combination with other herbicides, fungicides, insecticides, plant growth regulators, fertilizers, etc. When using the herbicide of the present invention, preferred results can be obtained by spraying the active ingredient in an amount of 200 to 500 ta per 10 ares by a commonly used spraying method.

Moreover, it goes without saying that the dosage can be adjusted as appropriate depending on the situation of the weed. The present invention will be explained below with reference to Examples.

Example 1 Granules R-4754 Parts by weight of cloud 1 part by weight of oxadiazone 44 parts by weight Pentonite 45 parts by weight The above components were thoroughly kneaded, granulated by a conventional method, and used as granules.

Example 2 Hydrating agent R-4754 4 parts by weight Oxadiazone 8 parts by weight Clay
47 parts by weight polyoxyethylene nonyl phenol ether
2 parts by weight Sodium alkylbenzenesulfonate 3 parts by weight The above components are mixed in a conventional manner and used as a wettable powder.

Example 3 Emulsion R-4754 3 parts by weight Oxadiazone 3 parts by weight Xylene 52 parts by weight Solpol 2539 (manufactured by Toho Kagaku Kogyo Co., Ltd.) 15 parts by weight The above components were mixed in a conventional manner and used as an emulsion.

Claims (1)

[Claims] 1S-isopropylhexahydro-1H-azepine-1-carbothioate and 5-tert. -butyl-3
- (2,4-dichloro-2-isopropoxyphenyl) A herbicidal composition characterized in that it is treated with a mixture of 1,3,4-oxadiazolin-2-one before transplanting to rice.