JPH10306007A - Herbicide composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a herbicide composition, especially one suitable for controlling weeds in soybean fields. SOLUTION: This herbicide composition contains N-(7-fluoro-3,4-dihydro-3- oxo-4-bromo-2-ynyl-2H-1,4-benzoxazin-6-yl)cyclohex-1-ene-1,2-dicarboxa mide and 4'-fluoro-N-isopropyl-2-(5-trifluoromethyl-1,3,4-thiadiazol-2-yloxy)ac etanilide as active ingredients, is capable of effectively killing various weeds emerging in crop land and non-crop land by application to soil or weeds, has synergistically increased herbicidal effects in comparison with their separative use, further enlarges a herbicidal spectrum and is capable of selectively controlling a wide range of weeds particularly causing a problem in soybean fields.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a herbicidal composition.

[0002]

2. Description of the Related Art At present, many herbicides are commercially available and used. However, since many kinds of weeds are to be controlled and their occurrence is long-term, more effective herbicidal effects are obtained. Therefore, there is a demand for safe herbicides in crops, which have a wide spectrum of herbicides and which have high cropping rates.

[0003]

The present inventors have conducted intensive studies to find an excellent herbicide and found that N- (7-fluoro-
3,4-dihydro-3-oxo-4-prop-2-ynyl-2H-1,4-benzoxazin-6-yl) cyclohex-1-ene-1,2-dicarboxamide (generic name flumioxazine, hereinafter Flumioxazine) and 4'-fluoro-N-isopropyl-2- (5-trifluoromethyl-1,3,4-thiadiazol-2-yloxy) acetanilide (generic name fluthiamide, hereinafter referred to as fluthiamide). By treating the herbicidal composition containing as an active ingredient a soil or a weed, various weeds generated on an agricultural land or a non-agricultural land can be effectively herbicidal. It is synergistically increased compared to when used, and further broadens the weed killing spectrum, and selectively removes a wide range of weeds, which are particularly problematic in corn fields. The present inventors have found that they can do so, and have reached the present invention. That is, the present invention provides a herbicidal composition (hereinafter, referred to as the present composition) containing flumioxazine and fluthiamide as active ingredients.

[0004]

BEST MODE FOR CARRYING OUT THE INVENTION In the composition of the present invention, flumioxazin, one of the active ingredients, is used in The Pestic.
ide Manual 10th edition (Crop Prote
Ction Publication, 1994
(Year) p. 489. Fluthiamide, the other active ingredient, is available from Brighton Crop.
Protection Conference We
eds-1995 Proceedings Volu
me 1 (The British Crop Pro
Tissue Council published 1995) 4
Compounds described on page 4.

The composition of the present invention is excellent as a herbicide because it has herbicidal activity against a wide range of weeds and has high selectivity to crops. In particular, the main weeds in the corn field, such as buckwheat, sanaetada, americana serrata, purslane, shiroza, ao-geitou, haragarashi, tsunoxanem, ebisugusa, ichibi, american sika deer, asaguasa, malvaa sagao, malvaa sagao Dicotyledonous plants such as Datura asiata, Dogwood physalis, Onamimomi, Sunflower, Bindweed, Euphorbiaceae, A. americana L., Ragweed, etc., and Inubie, Enokorogosa, Achinoekorogosa, Kinnoenokoro, Mehishiba,
It exerts herbicidal activity on monocotyledonous plants such as oakgrass, sorghum sorghum, barley, shutter cane, etc., but does not cause harmful effects on corn which is a crop or soybean which is a crop after corn. . Also,
The composition of the present invention can exhibit excellent herbicidal activity in non-tillage cultivation as well as ordinary tillage cultivation.

In the composition of the present invention, the mixing ratio of flumioxazine and fluthiamide as active ingredients is usually
The weight ratio is in the range of 1: 0.1 to 1,000.

The composition of the present invention is usually mixed with a solid carrier, a liquid carrier and the like, and, if necessary, added with a surfactant and other auxiliaries for preparation. Etc. and used as a formulation. In these preparations, the content of flumioxazine and fluthiamide is usually 0.5 to
It is in the range of 90% by weight, preferably 1-80% by weight.

[0008] The solid carrier used in the preparation includes, for example, clays (kaolinite, diatomaceous earth, synthetic hydrous silicon oxide, fubasamikure, bentonite, acid clay, etc.), talc, and other inorganic minerals (sericite, quartz) Powder, sulfur powder, activated carbon, calcium carbonate, etc.) Fine powders and granular materials such as fertilizers (ammonium sulfate, ammonium phosphate, ammonium nitrate, salt ammonium chloride, urea, etc.), and liquid carriers such as water, alcohols (E.g., methanol, ethanol), ketones (e.g., acetone, methyl ethyl ketone, cyclohexanone), aromatic hydrocarbons (e.g., toluene, xylene, ethylbenzene, methylnaphthalene), non-aromatic hydrocarbons (e.g., hexane, cyclohexane, etc.) Kerosene, etc.), esters (ethyl acetate, butyl acetate, etc.), nitriles (acetonitrile, isobutyronitrile) Etc.), e - ethers (dioxane, diisopropyl et - ether, etc.), 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 polyoxyethylenates thereof, and polyethylene glycol ethers.
Examples include ters, polyhydric alcohol esters, and sugar alcohol derivatives. Other formulation aids include:
For example, fixing agents such as casein, gelatin, polysaccharides (starch, gum arabic, cellulose derivatives, alginic acid, etc.), lignin derivatives, bentonite, synthetic water-soluble polymers (polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid, etc.). And dispersant, PAP (isopropyl isopropyl phosphate), BHT (2,6-tert-butyl-4-methylphenol), BHA (2- / 3-tert-butyl-
4-methoxyphenol), vegetable oil, mineral oil, fatty acid,
Stabilizers such as fatty acid esters are included.

[0010] The composition of the present invention can also be prepared by formulating each active ingredient by the above-mentioned formulation technique and then mixing them. The composition of the present invention thus formulated is applied to soil or a plant as it is or after diluted with water or the like. The composition of the present invention can further be expected to enhance herbicidal efficacy by being used in combination with other herbicides, and can also be used in combination with insecticides, fungicides, plant growth regulators, fertilizers, soil improvers, and the like. it can.

The application rate of the composition of the present invention may vary depending on the mixing ratio of flumioxazine and fluthiamide, which are the active ingredient compounds, weather conditions, preparation form, application time, application method, application place, weeds to be controlled, and target crops. The total amount of the active ingredient compound per hectare is usually 5 to 5000
g. For emulsions, wettable powders, suspensions, etc.
It is usually diluted with 100 to 1000 liters of water per hectare and applied. Granules and the like are usually applied without any dilution.

[0012]

[Examples] Formulation examples are shown below. In the following examples, parts represent parts by weight. Formulation Example 1 Flumioxazine 5 parts, Fluthiamide 40 parts, lignin sulfonate calcium 3 parts, sodium lauryl sulfate 2
Parts and 50 parts of synthetic hydrous silicon oxide are thoroughly pulverized and mixed to obtain a wettable powder. Formulation Example 2 Flumioxazine 8 parts, fluthiamide 64 parts, calcium lignin sulfonate 3 parts, sodium lauryl sulfate 2
Parts and 23 parts of synthetic hydrous silicon oxide are pulverized and mixed well to obtain a wettable powder. Formulation Example 3 40 parts of flumioxazin, 40 parts of fluthiamide, 3 parts of calcium ligninsulfonate, 2 parts of sodium lauryl sulfate and 15 parts of synthetic hydrous silicon oxide are thoroughly pulverized and mixed to obtain a wettable powder. Formulation Example 4 25 parts of flumioxazine, 10 parts of fluthiamide, 3 parts of calcium ligninsulfonate, 2 parts of sodium lauryl sulfate and 60 parts of synthetic hydrous silicon oxide are thoroughly pulverized and mixed to obtain a wettable powder. Formulation Example 5 3 parts of flumioxazine, 24 parts of fluthiamide, 3 parts of polyoxyethylene sorbitan monooleate, 3 parts of CMC (carboxymethylcellulose) and 67 parts of water are mixed, wet-pulverized until the particle size becomes 5 microns or less, and suspended. A turbidity agent is obtained. Formulation Example 6 5 parts of flumioxazine, 40 parts of fluthiamide, 3 parts of polyoxyethylene sorbitan monooleate, 3 parts of CMC (carboxymethylcellulose) and 49 parts of water are mixed, wet-pulverized until the particle size becomes 5 microns or less, and suspended. A turbidity agent is obtained. Formulation Example 7 Flumioxazine 20 parts, Fluthiamide 20 parts, polyoxyethylene sorbitan monooleate 3 parts, CMC
3 parts of (carboxymethylcellulose) and 54 parts of water are mixed and wet-pulverized until the particle size becomes 5 μm or less to obtain a suspending agent. Formulation Example 8 30 parts flumioxazine, 10 parts fluthiamide, 3 parts polyoxyethylene sorbitan monooleate, CMC
3 parts of (carboxymethylcellulose) and 54 parts of water are mixed and wet-pulverized until the particle size becomes 5 μm or less to obtain a suspending agent.

Test examples are shown below. In the following test examples, the evaluation of the herbicidal efficacy was made such that the emergence or growth state of the test weed at the time of the survey showed no or little difference compared to that of the untreated test weed, and the test plant was evaluated as “0”. Those that are completely killed or whose budding or growth is completely suppressed are referred to as "1.
0 ”as 11 levels from 0 to 10, 0, 1,
2, 3, 4, 5, 6, 7, 8, 9, and 10. In this evaluation, an evaluation value of "7" or more of the herbicidal effect means that a remarkable herbicidal effect is exhibited, and an evaluation value of "5" or less means that the herbicidal effect is insufficient. Evaluation of phytotoxicity
"Harmless" when little phytotoxicity is found, "Small" when mild phytotoxicity is found, "Medium" when moderate phytotoxicity is found, "Large" when severe phytotoxicity is found
Indicated by Test Example 1 Flumioxazine 2.5 parts, Toxanone P8L (Registered trademark of Sanyo Chemical Industry Co., Ltd.) 16.25 parts, Emulsion of flumioxazine and fluthiamide 2.5 parts obtained by thoroughly mixing 81.25 parts of cyclohexanone, Toxanone P8
L (Sanyo Kasei Kogyo KK) (16.25 parts) and 81.25 parts of cyclohexanone were mixed well to prepare a fluthiamide emulsion. 18cm in height, 20c in width
Fields soil was packed in a plastic pot having a depth of 7.5 cm and a depth of 7.5 cm, and corn, strawberry, American morning glory, American sika deer, Onami fir, Sanaetadae, Shirobana kosama asagao, Serihigyu, Mehishiba, Achinoekorogosa, and Inubiea were sown. Next, a predetermined amount of each of the above-mentioned emulsions and a mixture thereof was diluted with water so as to have a dose as shown in Table 1 below, and uniformly sprayed on the soil surface with a small sprayer. After the treatment, the plants were grown in a greenhouse, and on the eleventh day, the safety against corn and the herbicidal efficacy against weeds were examined. The results are shown in (Table 1).

[Table 1]

[0014]

EFFECTS OF THE INVENTION By using the composition of the present invention, a wide range of weeds in a field corn field, particularly in a corn field, can be selectively removed.

Claims (2)

[Claims] (1) N- (7-fluoro-3,4-dihydro-)
3-oxo-4-prop-2-ynyl-2H-1,4-
Benzoxazin-6-yl) cyclohex-1-ene-1,2-dicarboxamide and 4'-fluoro-N-isopropyl-2- (5-trifluoromethyl-1,3,
A herbicidal composition comprising 4-thiadiazol-2-yloxy) acetanilide as an active ingredient. 2. The herbicidal composition according to claim 1, for controlling weeds in a corn field.