JPH0881312A - Herbicidal composition - Google Patents

Abstract

PURPOSE: To obtain a herbicidal composition capable of selectively controlling weeds in a plowland, especially a wide range of weeds in soybean fields and manifesting synergistic effects by mixing a specific imide compound with a specified imidazolinone compound or its salt for use. CONSTITUTION: This herbicidal composition contains a 7-fluoro-6-[3,4,5,6- tetrahydrophthalimido]-4-(2-propynyl)-1,4-benzoxazin-3(2H)-one of formula I and (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5- ethyl-3- pyridinecarboxylic acid of formula II or its salt as active ingredients. In the composition, the mixing ratio of the compound of formula I to the compound of formula II or its salt is within the range of preferably 1:(0.1-10), especially 1:(0.25-10). The composition has higher herbicidal effects and a wider weeding spectrum without manifesting the phytotoxicity causing problems in soybeans and corn which is a succeeding crop of the soybeans.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a herbicidal composition, and more particularly to a herbicidal composition suitable for controlling weeds in soybean fields.

[0002]

2. Description of the Related Art Currently, many herbicides are commercially available and used. However, many weeds to be controlled have many kinds of weeds and their occurrence is long-term, so that the herbicidal effect is further improved. The herbicides are highly sought after, have a broad spectrum of herbicidal activity, and are safe for crops.

[0003]

Means for Solving the Problems As a result of intensive investigations by the present inventors to find an excellent herbicide, 7-
Fluoro-6- [3,4,5,6-tetrahydrophthalimide] -4- (2-propynyl) -1,4-benzoxazin-3 ( 2H ) -one

[Chemical 3] An imide compound (hereinafter referred to as compound A) and (±) -2- [4,5-dihydro-4-methyl-4-
(1-Methylethyl) -5-oxo-1H-imidazol-2-yl] -5-ethyl-3-pyridinecarboxylic acid

[Chemical 4] Imidazolinone compound (generic name imazethapyr
Hereinafter, referred to as compound B. ) Or a salt thereof (for example,
Alkali metal salts, alkaline earth metal salts, amine salts such as isopropylamine salts, and agrochemically acceptable salts such as ammonium salts) to be used in combination with field weeds, especially in soybean fields. The present invention has been completed by finding that a wide range of weeds can be selectively weeded, and that their herbicidal efficacy is synergistically increased as compared with the case where they are used alone. That is, the present invention provides a herbicidal composition comprising compound A and compound B or a salt thereof as active ingredients. Compound A is described in US Pat.
No. 707, wherein compound B is Farm C
hemicals Handbook, 1994 (published by Meister Publishing Co., 1994), page C300.

The composition of the present invention is effective for controlling a wide range of weeds, especially in soybean fields, and for applying it to new cultivation methods such as no-tillage cultivation. The composition is provided, the main weeds of soybean fields, for example, buckwheat vine, sanaetade, american scepter, purslane, white azalea, agatellium, velvetleaf, horned hemlock, ebisugusa, hibiscus, golden stag, American morning glory, Malva morning glory. ,
Maruba american morning glory, Datura strechata, Prunus densiflora, Corydalis, Sunflower, Convolvulus communis, dicotyledon, sedgegrass, American sedgegrass, ragweed, etc. It effectively weeds monocots and does not cause harmful phytotoxicity to soybeans, which are crops, and corn, which is a post-crop of soybeans.

In the composition of the present invention, the mixing ratio of the compound A and the compound B or a salt thereof can be varied over a wide range, but the weight ratio is usually 1: 0.1 to 20, preferably 1: 0.1. -10, more preferably 1: 0.25-1
The range is 0.

The composition of the present invention is usually mixed with a solid carrier, a liquid carrier, etc., and if necessary, a surfactant, other auxiliaries for formulation and the like are added thereto to prepare an emulsion, a wettable powder, a suspension, It is used after being formulated into granules and the like. In these formulations, the total amount of Compound A and Compound B or salts thereof is generally 0.5-.
90% by weight, preferably 1 to 80% by weight.

Examples of solid carriers used for formulation include clays (kaolinite, diatomaceous earth, synthetic hydrous silicon oxide, fubasami clay, bentonite, acid clay, etc.), talc, and other inorganic minerals (sericite, quartz powder). , Sulfur powder, activated carbon, calcium carbonate, etc., chemical fertilizers (ammonium sulphate, ammonium phosphate, ammonium nitrate, ammonium chloride, urea, etc.), etc., and the like, and the liquid carrier includes, for example, water and alcohols (methanol). , Ethanol, etc.), ketones (acetone, methyl ethyl ketone, cyclohexanone, etc.), aromatic hydrocarbons (toluene, xylene, ethylbenzene, methylnaphthalene, etc.), non-aromatic hydrocarbons (hexane, cyclohexane, kerosene, etc.), esters (Ethyl acetate, butyl acetate, etc.), Nitriles (acetonitrile, isobutyronitrile) ), Ethers (dioxane, diisopropyl ether), acid amides (dimethylformamide, dimethylacetamide), halogenated hydrocarbons (dichloroethane, trichlorethylene, etc.) and the like.

Examples of the surfactant include alkyl sulfates, alkyl sulfonates, alkyl aryl sulfonates, alkyl aryl ethers and polyoxyethylene compounds thereof, polyethylene glycol ethers, polyhydric alcohol esters, sugar alcohols. Examples thereof include derivatives. Other auxiliary agents for formulation include
For example, casein, gelatin, polysaccharides (starch, gum arabic, cellulose derivatives, alginic acid, etc.), lignin derivatives, bentonite, synthetic water-soluble polymers (polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid, etc.), etc. PAP (isopropyl acid phosphate), BHT (2,6-tert-butyl-4-methylphenol), BHA (2- / 3-tert-butyl-4-methoxyphenol), vegetable oil, mineral oil, fatty acid, fatty acid ester Stabilizers such as

The formulated composition of the present invention is applied to a plant or soil as it is or after diluted with water or the like. In the soil treatment, the preparation is usually sprayed on the soil surface, and if necessary, sprayed and then mixed with the soil surface. The composition of the present invention is
It can be expected to enhance herbicidal efficacy by mixing with other herbicides, and further insecticides, fungicides, plant growth regulators,
It can also be used in combination with fertilizers, soil conditioners and the like.

The application rate of the composition of the present invention is as follows: mixing ratio of the active ingredient compounds, compound A and compound B, or a salt thereof, weather conditions, formulation form, application time, application method, application site, weeds to be controlled, target. Depending on the crop, the total amount of active ingredient compounds per hectare is usually 20 to 400.
g, preferably 50 to 300 g. Emulsion, wettable powder,
Suspensions, etc. are usually used in a prescribed amount of 100 per hectare.
It is diluted with ˜1000 liters of water and applied, and granules and the like are usually applied without being diluted.

[0011]

[Examples] Formulation examples and test examples are shown below. In the following examples, parts represent parts by weight. Formulation Example 1 5 parts of compound A, 20 parts of compound B, 3 parts of calcium lignin sulfonate, 2 parts of sodium lauryl sulfate and 70 parts of synthetic hydrous silicon oxide are well pulverized and mixed to obtain a wettable powder. Formulation Example 2 Compound A (2 parts), compound B (20 parts), polyoxyethylene sorbitan monooleate (3 parts), CMC (carboxymethyl cellulose) (3 parts) and water (72 parts) are mixed to give a particle size of 5
Wet milling to submicron size to obtain suspension. Formulation Example 3 1 part of compound A, 4 parts of compound B, 1 part of synthetic hydrous silicon oxide,
Calcium lignin sulfonate 2 parts, bentonite 30
And 62 parts of kaolin clay are well pulverized and mixed, and after adding water and kneading well, granulation and drying are performed to obtain granules.

Test Example 1 A field plot of 40 cm × 35 cm, which was installed outdoors, was filled with upland soil and sown with crabgrass. When the crabgrass reached a plant height of 10 cm and 5 leaves, another test plot of the same scale was filled with upland soil, sowing bindweed, soybean, and corn were sowed, and the soil was covered with a thickness of 1 to 2 cm. A predetermined amount of the reagent which was made into a wettable powder according to Formulation Example 1 was diluted with water corresponding to 10 liters per 1 are in each test area, and was uniformly sprayed from above the plant or even on the soil surface. . On the 5th and 25th days after the treatment, the herbicidal efficacy against crabgrass (stem-leaf treating activity), the herbicidal efficacy against bindweed (Convolutus albicans) and the phytotoxicity against soybean and corn (soil-treating activity) were examined on the 43rd day. . The results are shown in Table 1. The herbicidal efficacy is indicated by the growth inhibition rate (%) calculated by the following equation 1 by measuring the fresh weight of the above-ground part of the test plant that remained dead during the survey.

[Equation 1]

[Table 1]

[0013]

The herbicidal composition of the present invention is extremely effective in controlling weeds in fields, especially soybean fields.

Claims (2)

[Claims] 1. Formula 1 And an imide compound represented by the following formula: The herbicidal composition containing the imidazolinone compound shown by these or its salt as an active ingredient. 2. The herbicidal composition according to claim 1 for controlling weeds in soybean fields.