CN1090452C - Herbicidal composition - Google Patents

Abstract

A herbicidal composition containing, as active ingredients, an imide compound of the formula [A] and an imidazolinone compound of the formula [B] or an agrochemically acceptable salt thereof is useful for selectively controlling dry fields , especially various harmful weeds in dryland soybean fields.

Description

herbicidal composition

The present invention relates to a herbicidal composition. More specifically, the present invention relates to herbicidal compositions for selectively controlling various noxious weeds in upland soybean fields.

There are many herbicides that are now marketed and actually used on field and horticultural crops. Many species of noxious weeds should be controlled, but the germination of these weeds continues for a long time. For this reason, some herbicides are required to have a high herbicidal effect and a broad weed control spectrum, and to be sufficiently safe to crops.

The inventors of the present invention have devoted themselves to research and development of the above-mentioned good herbicides. As a result, they found that the combination of the following specific herbicidal compounds could selectively control various noxious weeds in dryland, especially in dryland soybean fields, and they further found that the herbicidal The herbicidal effects of the compounds are synergistically enhanced, thereby completing the present invention.

和(±)-2-[4，5-二氢-4-甲基-4-(-1-甲基乙基)-5-氧代-1H-咪唑-2-基]-5-乙基-3-吡啶羧酸(下文中称作为化合物B)，即下式的咪唑啉酮化合物，或其农业化学上可接受的盐：

Thus, the present invention provides a herbicidal composition comprising, as an active ingredient, 7-fluoro-6-[3,4,5,6-tetrahydrophthalimido]-4-( 2-propynyl)-1,4-benzoxazin-3(2H)-one (hereinafter referred to as compound A), that is, an imide compound of the following formula:

and (±)-2-[4,5-dihydro-4-methyl-4-(-1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl -3-pyridinecarboxylic acid (hereinafter referred to as compound B), an imidazolinone compound of the following formula, or an agrochemically acceptable salt thereof:

The present invention also provides a method for controlling harmful weeds, which comprises applying a herbicidally effective amount of the above-mentioned composition to the area where harmful weeds grow or will grow.

The herbicidal composition of the present invention is characterized in that it contains a combination of compounds A and B as active ingredients. These compounds are compounds known in the prior art, compound A is disclosed in U.S. Patent No. 4,640,707, and compound B is generally called "imazethapyr" and is described, for example, in Farm Chemicals Handbook, 1994 (Published by Meister Publishing Co.) Page C300.

As mentioned above, compound B can be used in the form of its agrochemically acceptable salt. Examples of its agrochemically acceptable salts are alkali metal salts, alkaline earth metal salts, amine salts such as isopropylamine salts, and ammonium salts.

The herbicidal composition of the present invention can be used in upland fields, especially upland soybean fields, to selectively control various harmful weeds, and there is no problem for crops such as the previous crop soybean (Glycine max) and the subsequent crop corn (Zea mays) of phytotoxicity. The composition can also be used in new cultivation methods, such as no-tillage cultivation.

Examples of noxious weeds that can be controlled in dryland soybean fields are dicotyledonous weeds such as Buckwheat vine (Polygonum convolvulus), Polygonum lapathifolium (Polygonum pensylvanicum), Purslane (Portulaca oleracea), Polygonum (Chenopodium album), Amaranthus retroflexus, Sinapis arvensis, Sesbania exaltata, Cassia obtusifolia, Abutilon theophrasti, Sida spinosa), Ipomoea hederacea, Ipomoea purpurea, Ipomoea hederacea var. integriuscula, Datura stramonium, Solanum nigrum, Pennsylvania ear (Xanthium pensylvanicum), sunflower (Helianthus annuus), field bindweed (Convolvulus arvensis), marigold (Euphorbia helioscopia), glabra (Bidens frondosa) and American ragweed (Ambrosia artemisiifolia); and monocotyledonous weeds such as barnyardgrass ( Echinochloa crus-galli), foxtail (Setaria viridis), giant foxtail (Setaria faberi), golden foxtail (Setaria glauca), crabgrass (Digitaria ciliaris), goosegrass (Eleusine indica), Arab sorghum (Sorghum halepense), Creeping wheatgrass (Agropyron repens) and bicolor milo (Sorghum bicolor).

In the herbicidal composition of the present invention, the mixing ratio of compound A to compound B or a salt thereof can be varied within a wide range, but the usual range is 1:0.1 to 20 by weight, preferably 1:0.1 by weight to 10, and more preferably 1:0.25 to 10 by weight.

When applied, the herbicidal composition of the present invention is usually mixed with a solid or liquid carrier or diluent, and if necessary, mixed with a surfactant or other auxiliaries, and then formulated into various preparations such as emulsifiable concentrates, wettable powders, suspensions doses or granules.

The total amount of the active ingredient contained in the preparation is usually in the range of 0.5% to 90% by weight, preferably 1% to 80% by weight.

Examples of solid form carriers or diluents are fine powders or granules of clay substances such as kaolin, diatomaceous earth, synthetic hydrated silica, Fubasami clay, bentonite and terra alba; talc and other inorganic minerals such as silk mica, quartz powder , sulfur powder, activated carbon and calcium carbonate; and chemical fertilizers such as ammonium sulfate, ammonium phosphate, ammonium nitrate, ammonium chloride and urea. Examples of carriers or diluents in liquid form are water, alcohols such as methanol and ethanol; ketones such as acetone, methyl ethyl ketone and cyclohexanone; aromatic hydrocarbons such as toluene, xylene, ethylbenzene and methylnaphthalene ; non-aromatic hydrocarbons such as hexane, cyclohexane and kerosene; esters such as ethyl acetate and butyl acetate; nitriles such as acetonitrile and isobutyronitrile; ethers such as dioxane and diisopropyl ether; amides Such as dimethylformamide and dimethylacetamide; and halogenated hydrocarbons such as dichloroethane and trichloroethylene.

Examples of surfactants are alkyl sulfates, alkylsulfonates, alkylarylsulfonates, alkylaryl ethers and their polyoxyethylene derivatives, polyethylene glycol ethers, polyol esters and sugar alcohols derivative.

Examples of auxiliaries are casein, gelatin, polysaccharides such as starch, gum arabic, cellulose derivatives and alginic acid which can be used as adhesives or dispersants; lignin derivatives, bentonite, synthetic water-soluble polymers such as polyethylene Alcohol, polyvinylpyrrolidone and polyacrylic acid; and PAP (isopropyl phosphate), BHT (2,6-tert-butyl-4-methylphenol), BHA (2-/3-tert-butyl 4-methoxyphenol), vegetable oils, mineral oils, fatty acids and fatty acid esters.

The herbicidal composition of the present invention formulated as above can be applied to plants or upland soil as such without any dilution or after dilution, for example with water. Usually soil treatment is carried out by spraying the formulation on the soil surface and, if necessary, mixing the formulation with the surface soil after spraying.

The herbicidal composition of the present invention can be used to mix with other herbicides to enhance their herbicidal effects. Moreover, it can also be used with insecticides, fungicides, plant growth regulators, fertilizers, soil amendments, and more.

Usually the herbicidal composition of the present invention is used in an amount of 20 to 400 g, preferably 50 to 300 g, of the total amount of active ingredient per hectare, although the amount of use can vary depending on the mixing ratio of the active ingredient, prevailing climatic conditions, type of formulation, application Time, method of application, location of application, harmful weeds to be controlled and crops to be protected. In the case of emulsifiable concentrates, wettable powders or suspension concentrates, the preparations are usually used after diluting the given amount with about 100 to 1000 liters of water per hectare. In the case of granules, the formulation is usually applied without any dilution.

The following formulation examples and drug effect examples will further illustrate the present invention, and they do not constitute a limitation to the scope of the present invention. In these formulations and efficacy examples, all parts are by weight.

Formulation Example 1

5 parts of compound A, 20 parts of compound B, 3 parts of calcium lignosulfonate, 2 parts of sodium lauryl sulfate and 70 parts of synthetic hydrated silica were well ground and mixed to obtain a wettable powder.

Formulation Example 2

2 parts of compound A, 20 parts of compound B, 3 parts of polyoxyethylene sorbitan monooleate, 3 parts of CMC and 72 parts of water were mixed, and then ground until the average particle size was 5 μm or less to obtain a suspension concentrate.

Formulation Example 3

1 part of compound A, 4 parts of compound B, 1 part of synthetic hydrated silica, 2 parts of calcium lignosulfonate, 30 parts of bentonite and 62 parts of kaolin were thoroughly ground and mixed, and water was added to fully knead the mixture, granulated and dried to Get granules.

Example of efficacy

Cover dry field soil and sow crabgrass (Digitaria ciliaris) in an outdoor experimental field with an area of 40cm×35cm, followed by cultivation. When the plant grows to the 5-leaf stage and is about 10 cm high, spread dry field soil and sow field bindweed (Convolvulus arvensis), soybean (Glycine max) and corn (Zeamays) in other test fields of the same area, and then cover with 2 cm thick soil , the given amount of herbicidal composition formulated as wettable powder according to formulation embodiment 1 is diluted with water at a volume ratio of 10 liters per hectare, and the diluted solution is evenly sprayed on the plant or soil surface. The herbicidal effect of foliar treatment of crabgrass was measured on the 5th or 25th day after treatment. On the 43rd day after the treatment, the herbicidal effect of the soil treatment on bindweed and the phytotoxicity to soybean and corn were determined. The results are shown in the table below.

The herbicidal activity was determined by measuring the wet weight of the above-ground parts of the test plants not adversely affected at the time of examination, and it was expressed by the growth inhibition rate (%) calculated by the following formula:

surface Test composition Amount of active ingredient used (g/ha) mixing ratio Foliar treatment soil treatment Herbicidal activity Herbicidal activity Phytotoxicity Crabgrass (Day 5) Crabgrass (Day 25) field bindweed soybean corn Ammonium salt of Compound A+Compound B 100+100 1:1 100 95 100 none none 100+200 1:2 100 100 100 none none Ammonium salt of Compound A Compound B 100100200 --- 706070 2060100 30015 no no no no no no

As can be seen from the above table, the herbicidal composition of the present invention is very useful in selectively controlling various harmful weeds in upland crops such as soybean and corn.

Claims (4)

1. A herbicidal composition comprising, as an active ingredient, an imide compound of the formula [A]:

and an imidazolinone compound of formula [B] or an agrochemically acceptable salt thereof, Wherein, the mixing ratio of the imide compound and the imidazolinone compound is 1:0.1 to 20 by weight. 2. Use of the herbicidal composition according to claim 1 for controlling harmful weeds in upland soybean fields. 3. A method for controlling noxious weeds, which comprises applying a herbicidally effective amount of the composition according to claim 1 to an area where noxious weeds grow or will grow. 4. The method according to claim 3, wherein the application is carried out in upland soybean fields.