JP2000239111A - Mixed herbicide composition for rice paddy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a mixed herbicide composition for rice paddy capable of manifesting an excellent weed control and an effect in terns of chemical injury in a rice paddy by including herbicidal tetrasolinones and known herbicidal sulfoniumureas as active ingredients. SOLUTION: This composition includes (A) 1 pt.wt of 1-(2-chlorophenyl)-4-(N- cyclohexyl-N-ethylcarbamoyl)-5(4H)-tetrazolinone, (B) 0.125-0.5 pt.wt of methyl α-(4,6-dimethoxypyrimizin-2-ylcarbamoylsuflamoyl)-o-toluate or 0.06-0.2 pt. of ethyl 5-(4,6-dimethoxypyrimizin-2-ylcarbamoylsulfamoyl)-1-methylpyrazol-4- carboxylate as the herbicidal ingredients. The composition is preferably applied to rice paddy from right after to ten days after transplantation of seedlings of paddy rice. The composition is a one capable of expecting exact herbicidal effects on several kinds of paddy weeds and excellent residual effects.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a herbicide mixture composition for paddy fields. More specifically, the present invention relates to a herbicide mixture composition for a paddy field, comprising a herbicidal tetrazolinone and a known herbicidal sulfonylurea as active ingredients.

[0002]

2. Description of the Related Art Paddy rice cultivation in Northeast Asia has been carried out mainly on transplanted rice, and
Herbicides used in transplanted paddy rice cultivation are usually applied in the form of a mixed composition containing two or more active ingredients. However, even with such a mixed composition, it is still unsatisfactory in view of the application time, the target weed, the amount of the active ingredient, the phytotoxicity to the crop, and the complex factors such as the repellency of the herbicidal effect. .

[0003]

Means for Solving the Problems The present inventors have found that the following mixed composition can be used for controlling weeds in paddy fields, in particular, for controlling weeds immediately after transplantation of rice plants or at an advanced leaf age, and in terms of phytotoxicity of rice. Has been found to exhibit extremely good and desirable effects.

Thus, the present invention provides (a) 1- (2-chlorophenyl) -4- (N-cyclohexyl-N-ethylcarbamoyl) -5 (4H) as a herbicidal active ingredient.
1 part by weight of tetrazolinone and (b) methyl α-
(4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluate 0.125-
0.5 parts by weight or ethyl 5- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -1
-Methylpyrazole-4-carboxylate 0.06
It is intended to provide a herbicide mixture composition for paddy fields, characterized in that the composition contains up to 0.2 parts by weight.

According to the above-mentioned mixed composition of the present invention, surprisingly, the herbicidal activity is substantially higher than the sum of the effects of the active compounds alone as compared with the case where each active compound is used alone. In effect, the combined compositions of the present invention, when performing weed control, make it possible to substantially reduce the concentrations of the individual drugs used so far, while at the same time obtaining a broad herbicidal spectrum. In particular, the suitable range of treatment can be used over a long period of time from immediately after transplanting the rice seedlings to 10 days after, showing excellent herbicidal effects even when used.
In addition, it has a long-lasting effect, is excellent in residual effect, and has an excellent herbicidal effect without phytotoxicity to rice.

In view of the above characteristics, the present invention further provides the paddy field herbicide mixture composition of the present invention immediately after transplantation of rice seedlings (usually 2.
The present invention provides a method for controlling paddy field weeds, wherein the method is applied during the period from the fifth leaf stage to ten days later.

The above-mentioned herbicidal active ingredient (a) is a known herbicidal compound and is described in, for example, JP-A-6-306061. The herbicidal active ingredient (b) is also known, and is described, for example, in "Agricultural Chemical Handbook" 1998 edition (issued by the Japan Plant Protection Association on December 15, 1998).

[0008] The mixed composition of the present invention exhibits a strong herbicidal effect on paddy field weeds. Therefore, the composition can be advantageously used as a mixed herbicide composition for paddy fields, particularly a selective herbicide composition for paddy rice.

[0009] The composition of the present invention can be used for various kinds of weeds occurring in paddy fields. Examples include: Dicotyledonous plants of the following genera : Polygonum, Polygonum, Rorippa, Rotala, Lindernia, Bidens, Abnum (D
opatrium), genus Eclipta, genus Echinacea (Elatine), genus Aberdeen (Gratiola), genus Lazenia (Lindernia), genus Luxwigi (Ludwigi)
a), Oenanthe, Ranunculu
s), and the genus Deinostema.

[0010] Monocotyledonous plants of the following genus : Echinochlo
a), Millet (Panicum), Poa
a), Cyperus, Cyperus (Mono)
choria), Tenmuki (Fimbristylis), Kwai (Sa)
gittaria), genus Eleocharis, and genus Firefly (Sc
irpus), Spiraea (Alisma), Ilexa (Ane)
ilema), Blyxa and Eriocaulo
n), Hirumushiro (Potamogeton) and the like.

The composition of the present invention can be used specifically for the following typical paddy weeds.

Plant name Latin name Dicotyledon Plant Kilaga rotunda Rotala indica Koehne Azena Lindernia procumbens Philcox Plumbum Ludwigia prostrata Roxburgh Hirumeshiro Potamogeton distinctus A. Benn Mizohacobe Elatine triandra Schk Seri Oenanthe javanica nipple Echina ova Echina monochae nipples Eenia echina monochae nipples Oenanthe javanica nipples Eoena ova Echiola monophyllum monophyllum monoecho nana Eicola monophyllum . Kuroguwai Eleocharis Kuroguwai Ohwi Cyperus difformis L. Cyperus serotinus Rottboel Urikawa Sagittaria pygmaea Miq Hera modaka Alisma canaliculatum A. Br. However, the present invention can be similarly applied to other weeds.

In the composition of the present invention, methyl α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-toluate, which is the herbicidally active ingredient (b), is contained in an amount of 1% by weight of the herbicidally active ingredient (a). 0.12 per copy
5 to 0.5 parts by weight, and ethyl 5- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl-1-methylpyrazole-4-carboxylate are used in an amount of 0.1 to 1 part by weight of the herbicidally active ingredient (a). It can be mixed with the herbicidal active ingredient (a) at a ratio of 06 to 0.2 parts by weight.

When the composition of the present invention is used for controlling paddy field weeds, it can be made into a usual formulation. Examples of the preparation form include liquids, emulsions, wettable powders, suspensions, powders, soluble powders, granules, suspension emulsion concentrates, solids (jumbo), floating granules, and polymer substances. And the microcapsules therein.

These preparations can be prepared by a method known per se. For example, the components (a) and (b) may be combined with a spreading agent, ie, a liquid diluent and / or a solid diluent, and, if necessary, a surfactant, ie, an emulsifier and / or dispersant. A formulation according to the invention can be prepared by mixing with a foam-forming agent.

When water is used as the spreading agent, for example, an organic solvent can be used as an auxiliary solvent. As the liquid diluent, for example, aromatic hydrocarbons (for example,
Xylene, toluene, alkylnaphthalene, etc.), chlorinated aromatic or chlorinated aliphatic hydrocarbons (eg, chlorobenzenes, ethylene chloride, methylene chloride, etc.), aliphatic hydrocarbons [eg, cyclohexane, etc. or paraffins ( For example, mineral oil fractions, minerals, vegetable oils, etc.)], alcohols (eg, butanol, glycol and their ethers or esters), ketones (eg, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), strong polar solvents (eg, For example, organic solvents such as dimethylformamide and dimethylsulfoxide) and water can be mentioned.

Examples of solid diluents include ammonium salts and soil natural minerals (eg, kaolin, clay, talc, chalk, quartz, attapulgite, montmorillonite, diatomaceous earth, etc.) and soil synthetic minerals (eg, highly dispersed silicic acid, alumina Silicate, etc.). Solid carriers for granules include, for example, crushed and fractionated rocks (eg, calcite, marble, pumice, sepiolite, dolomite, etc.), synthetic particles of inorganic and organic powders,
Fine organic substance (eg, sawdust, coconut, corn cob, tobacco stem, etc.) and the like can be used.

Examples of the emulsifier and / or foaming agent include nonionic and anionic emulsifiers [eg, polyoxyethylene fatty acid esters, polyoxyethylene fatty alcohol ethers (eg, alkylaryl polyglycol ethers, alkyl sulfonates, Alkyl sulfates, aryl sulfonates, etc.]] and albumin hydrolysis products.

As the dispersant, for example, lignin sulfate waste liquid and methyl cellulose are suitable.

Fixatives can also be used in the preparations (powders, granules, emulsions), such as carboxymethylcellulose, natural and synthetic polymers (eg gum arabic, polyvinyl alcohol, polyvinyl acetates) And the like, natural phospholipids (eg, cephalins, lecithins, etc.), and synthetic phospholipids. Furthermore, mineral and vegetable oils can be used as additives.

Coloring agents may be used. Examples of the coloring agents include inorganic pigments (eg, iron oxide, titanium oxide, Prussian blue, etc.), organic dyes such as alizarin dyes, azo dyes and metal phthalocyanine dyes. And furthermore, minor elements such as salts of iron, manganese, boron, copper, cobalt, molybdenum, zinc and the like.

The preparation is generally prepared by adding component (a) and component (b) in a total amount of 0.1 to 95% by weight, preferably 0.5 to 90% by weight.
It can be contained in a concentration of% by weight.

The composition of the present invention can be used as it is or in the form of a preparation for controlling weeds, and can be mixed in a tank at the time of use. It is also possible to incorporate active compounds which are usually used in paddy fields, for example fungicides, insecticides, plant growth regulators, plant nutrients, soil conditioners, safeners and / or other herbicides. . As a preferred example, the herbicidal sulfonamides (a) may be added to the composition of the present invention as a safener, for example, by 1 part by weight.
1-200 parts by weight, preferably 2-100 parts by weight, of-(α, α-dimethylbenzyl) -3-p-tolylurea can be added.

The composition of the present invention may be used as it is, in the form of a preparation, or in an application form prepared by further diluting the preparation, for example, a ready-to-use sol.
ution), emulsions, suspensions, powders, wettable powders or granules. These forms can be obtained in the customary manner, for example by watering, spraying.
ng, atomizing), dusting, granulation and the like.

The composition of the present invention can be applied to paddy fields before, simultaneously with, or after rice transplanting, but is particularly preferably applied to paddy fields immediately after rice transplanting until 10 days after rice transplanting. The amount of the composition that can be applied can vary within a substantial range. The application rate is, for example, 0.1 to 0.5 kg / ha as a total amount of the component (a) and the component (b),
Preferably, it can be in the range of 0.15 to 0.3 kg / ha.

The excellent effects of the composition of the present invention will be more specifically described by the following examples. However, the present invention should not be limited to this.

[0027]

EXAMPLES Biological test examples and preparation examples: Active compound (component) (a): 1- (2-chlorophenyl) -4- (N-cyclohexyl-N-ethylcarbamoyl) -5 (4H)
-Tetrazolinone, (b-1): methyl α- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -o-
Toluate, (b-2): ethyl 5- (4,6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -1-
Methylpyrazole-4-carboxylate Example 1 (biological test): Effect test of herbicide composition on paddy weeds I Pot of 1/2000 ares (25 × 20 × 9 cm)
Was filled with paddy soil, and three rice plants (variety: Nipponbare) at the 2.5 leaf stage (plant height: 15 cm) were planted at three plants per pot and transplanted at two locations.

Next, tubers of Echinacea purpurea, Echinacea purpurea, Konagi, broadleaf weeds (Azena, Kikasigusa, Mizohakobe, Himemisohagi, Abnome, etc.), tubers of Mizugayatsuri and Firefly were inoculated, and were flooded for about 2 to 3 cm. Seven days after rice transplantation, the active compound mixture or the active compound in the form of granules prepared according to Preparation Example 1 described below was treated with water. After the treatment, the state of flooding of 3 cm was maintained, and three weeks after the chemical treatment, the herbicidal effect and the degree of phytotoxicity were observed and evaluated in terms of%.

100%: Complete death 0%: No effect or no phytotoxicity The results are shown in Table 1.

[0030]

[Table 1] Example 2 (Biological test): Effect test of herbicidal composition on paddy weeds II Under the same conditions as in Example 1, transplanted paddy rice and various weeds were prepared, and immediately after being flooded to about 2 to 3 cm, the following formulation The test chemicals prepared according to Example 2 were subjected to a water treatment, and the herbicidal effect and the degree of phytotoxicity were evaluated under the same conditions as in Example 1. Table 2 shows the results.

[0031]

[Table 2] Formulation Example 1 Active compound (a) 2 parts by weight, active compound (b-1) 0.
5 parts by weight, bentonite (montmorillonite) 36.5
25 parts by weight of water, a mixture of 58 parts by weight of talc (talc) and 3 parts by weight of ligninsulfonate is kneaded well, and the mixture is extruded into granules of 10 to 40 mesh by an extrusion granulator. Dry at ℃ to make granules.

Formulation Example 2 Clay mineral particles 99.2 having a particle size distribution of 0.2 to 2 mm
Parts by weight into a rotary mixer, 0.7 parts by weight of the active compound (a) together with the liquid diluent under rotation and the active compound (b-
1) After spraying 0.1 parts by weight to make it even,
Dry at 50 ° C. to make granules.

Formulation Example 3 4 parts by weight of active compound (a), 2 parts by weight of active compound (b-1), 10 parts by weight of ethylene glycol, 5 parts by weight of polyoxyalkylene tristyrylphenyl ether, 0.5 parts by weight of xanthan gum, A mixture of 0.1 part by weight of 14% silicone oil emulsion and 78.4 parts by weight of water is thoroughly stirred, and then pulverized with a pulverizer (Dynomill KDL type) to obtain an aqueous suspension preparation.

Formulation Example 4 5 parts by weight of active compound (a), 1 part by weight of active compound (b-2), 40 parts by weight of sodium ligninsulfonate, 17 parts by weight of bentonite and 37 parts by weight of calcined diatomaceous earth powder After mixing, adding water and kneading well,
Extrude and dry with a 0.3 mm screen to obtain a wettable powder in granular form.

[0035]

The herbicide mixture composition for paddy fields according to the present invention, as shown in the above-mentioned biological test examples, shows an accurate control effect on various paddy field weeds and also shows an excellent residual effect. .

Claims (2)

[Claims] 1. A herbicidal active ingredient comprising: (a) 1 part by weight of 1- (2-chlorophenyl) -4- (N-cyclohexyl-N-ethylcarbamoyl) -5 (4H) -tetrazolinone; and (b) methyl α -(4,6-dimethoxypyrimidine-
2-ylcarbamoylsulfamoyl) -o-toluate 0.125 to 0.5 parts by weight or ethyl 5- (4,4
A herbicide mixture composition for a paddy field, comprising 0.06-0.2 parts by weight of 6-dimethoxypyrimidin-2-ylcarbamoylsulfamoyl) -1-methylpyrazole-4-carboxylate. 2. A method for controlling weeds in paddy fields, comprising applying the herbicide mixture composition for paddy fields according to claim 1 immediately after transplanting the rice seedlings until 10 days after the transplantation.