JPH04257503A - Herbicide composition - Google Patents

Abstract

PURPOSE:To provide a herbicide composition containing two kinds of known herbicidal components, having synergistically improved herbicidal effect of each component, effective at a low rate of application and capable of completely controlling annual and perennial weeds at a low rate of application without causing phytotoxicity to corn. CONSTITUTION:The objective composition contains (A) the compound of formula I and (B) one or more kinds of compounds selected from alachlor, metolachlor and acetochlor of formula II to formula IV. The amount of the component A is 0.001-10 pts.wt., preferably 0.01-1 pt.wt. per 1 pt.wt. of the component B. The herbicidal activity of the composition is not a simple addition but a synergism of the activities of the components. The composition is effective at a low rate of application, i.e., 1g to 1kg/ha of A and 10g to 5kg/ha of B, preferably 10g to 5kg/ha of A and 50g to 3kg/ha of B. Although the composition is effective by the foliar treatment after germination, it is preferable to use the composition by soil treatment before germination. It can be applied to various crops other than corn and other agricultural and horticultural fields and uncultivated field to develop remarkable economic effect.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a herbicidal composition that efficiently controls various harmful weeds by mixing two known herbicidal active ingredients.

0002

BACKGROUND OF THE INVENTION A wide variety of herbicides have been put into practical use through many years of research and development on herbicides, and these herbicides have contributed to saving labor in weed control work and improving the productivity of agricultural and horticultural crops. Even today, there is a demand for the development of new chemicals with better herbicidal properties, and in particular, as herbicides for agriculture and horticulture, they are used to selectively control only target weeds at low doses without causing harm to cultivated crops. It is desirable to be able to do so, but
Existing drugs do not necessarily meet this requirement.

[0003] The compound represented by formula (1) (hereinafter referred to as compound (1)) is a known compound described in JP-A-2-173, and is used in lower doses than conventional herbicides. Although it has excellent herbicidal effects and is highly safe for crops such as corn and wheat, it is less effective against some weeds. On the other hand, the compound represented by formula (2) (generic name alachlor), the compound represented by formula (3) (generic name metolachlor), and the compound represented by formula (4) (generic name acetochlor) are It is used in practical situations and is highly effective against grass weeds, but it is often less effective against broad-leaved weeds, and the dosage is also high.

0004

[Case 2]

[0005]

[Means for solving the problem] The present invention provides compound (1)
and a herbicide composition (hereinafter referred to as the composition of the present invention) containing one selected from alachlor, metolachlor, and acetochlor as an active ingredient. The composition of the present invention has the herbicidal effects of compound (1) and alachlor, metolachlor, or acetochlor contained in the composition of the present invention not only additively but also synergistically. The amount of each drug used can be reduced.

[0006] Furthermore, the composition of the present invention can completely control annual and perennial grass weeds, broad-leaved weeds, and Cyperaceae weeds at low doses without causing any phytotoxicity to corn, and is therefore useful in practical situations. The quality is extremely high. Although the composition of the present invention is effective in treating the foliage of weeds after germination, pre-emergence soil treatment is more effective. It is also useful for various grains other than corn, and can also be used to control various weeds in agricultural and horticultural fields such as fields and orchards, as well as non-agricultural lands such as playgrounds, vacant lots, forest lands, tank yards, and railway edges. It can be applied and shows great economic effect in weed control.

The composition of the present invention contains a compound (
Contains 0.001 to 10 parts by weight of 1). Preferably alachlor, metolachlor or acetochlor 1
It contains 0.01 to 1 part by weight of compound (1) per part by weight. The treatment amount of the composition of the present invention depends on the type of specific target plant whose growth is to be inhibited, but the amount of compound (1) as an active ingredient is 1 g to 1 kg/ha, preferably 10
g ~ 0.5 kg/ha, and alachlor, metolachlor or acetochlor 10 g ~ 5 kg/h
a, preferably 50g to 3kg/ha.

The composition of the present invention is usually used in the form of a preparation mixed with a carrier consisting of a solid or liquid diluent, but it is preferably used in the form of a preparation further mixed with a surfactant. Examples of carriers include solid carriers such as clay, talc, bentonite, diatomaceous earth, and white carbon, water, alcohols (isopropanol, butanol, benzyl alcohol, furfuryl alcohol, etc.), aromatic hydrocarbons (toluene, xylene, etc.), Chlorinated hydrocarbons (chlorobenzene, etc.), ethers (anisole, etc.), ketones (cyclohexanone, isophorone, etc.), esters (
butyl acetate, etc.), acid amides (N-methylpyrrolidone, etc.), and the like.

Examples of surfactants include sodium alkylaryl sulfonate, sodium alkylnaphthalene sulfonate, sodium dialkyl succinate, polyoxyethylene alkylaryl ether sulfate,
Anionic surfactants such as alkyl phosphate esters and alkylphenol phosphate esters, polyoxyethylene alkyl ethers, polyoxyethylene alkylaryl ethers, polyoxyethylene (propylene) fatty acid esters, sorbitan monooleate, polyoxyethylene sorbitan monolaurate and vegetable oil derivatives such as polyoxyethylene hydrogenated castor oil.

The composition of the present invention can be prepared by adding emulsifiers, wetting agents, dispersants, binders, penetrants, spreading agents, stabilizers, etc. as desired, to form emulsions, solutions, wettable powders, powders, granules, etc. It can be put to practical use in any dosage form such as granules and suspensions. At this time, it is also possible to use the compound simultaneously with a plurality of known herbicides. Preferred drugs to be used in combination with the composition of the present invention include atrazine, which is listed in the 1989 Pesticide Data Book (published by Soft Science);
simazine, cyanazine
azine), glyphosate
), bialaphos, paraquat, dicamba
, chloramben, bentazone, E.P.C.
PTC), glufosinate
, butylate, diuron (d
iuron), linuron, metribuzin, pendimethalin, 2,4-di(
2,4-D), MCP, and tridiphane, as well as nicosulfuron, primisulfuron, and the like.

The synergistic herbicidal effect of herbicide mixtures can be explained as follows. That is, individual active compounds often exhibit drawbacks in their herbicidal activity, but in such cases, the herbicidal activity of the combination of two active compounds is simply the sum of the activities of each of the two compounds ( When the activity is greater than the expected activity, this is called synergism. The expected activity of a particular combination of two herbicides can be calculated as follows. (Colby (
Colby S. R. ), Calculation of synergistic and antagonistic responses of herbicide combinations, Weed, Vol.
5, pp. 20-22 (1967)) E=α+β−(α・β/100) α: Inhibition rate when herbicide A is treated at a kg/ha amount β: Herbicide B at bkg Suppression rate E when treated at an amount of /ha: akg/ha of herbicide A, bkg of herbicide B
If the expected inhibition rate, that is, the actual inhibition rate when treated at an amount of /ha is greater than the above calculation, it can be said that the combined activity exhibits a synergistic effect.

0012

[Examples] The composition of the present invention will be explained in more detail below with reference to Examples, but the compounds, production amounts, dosage forms, etc. of the present invention are not limited to the Examples. In addition, all "parts" mean parts by weight. [Formulation Example 1] Wettable powder compound (1) ─────── 2
Part Alacrol ────────
24 Part Sieglite PFP ──────
─ Part 66 (Kaolin clay: Sieglite Industries Co., Ltd. product name) Solpol 5039 ──
──── 2 parts (wetting and dispersing agent: Toho Chemical Co., Ltd. trade name) soybean oil ────
──── 2 parts Carplex 0 ──────── 4 parts or more (white carbon: Shionogi Pharmaceutical Co., Ltd. trade name) are mixed and ground uniformly to make a wettable powder.

[Formulation Example 2] Wettable powder compound (1)
─────── 2 parts Metolachlor ─────── 20 parts Siegrite PFP ──────── 70
Part Solpol 5039 ────────
Part 2 Soybean oil ──
────── 2 parts Carplex 0 ─────── 4 parts or more are mixed and ground uniformly to make a wettable powder.

[Formulation Example 3] Wettable powder compound (1)
─────── 3 parts Metolachlor ─────── 27 parts Siegrite PFP ─────── 62
Part Solpol 5039 ────────
Part 2 Soybean oil ──
────── 2 parts Carplex 0 ─────── 4 parts or more are mixed and ground uniformly to make a wettable powder.

[Formulation Example 4] Emulsion compound (1)
─────── 3 parts alachlor ─────── 35 parts xylene ─────── 47
Part methylnaphthalene ──────── 1
0 part Solpol 2680 ──────
- 5 parts (mixture of nonionic surfactant and anionic surfactant: trade name of Toho Chemical Industry Co., Ltd.) The above are uniformly mixed and dissolved to form an emulsion.

[Formulation Example 5] Emulsion compound (1)
──────── 2 parts metolachlor ─────── 25 parts xylene ──────── 58
Part methylnaphthalene ──────── 10
Department Solpol 2680 ────────
5 parts or more are uniformly mixed and dissolved to form an emulsion.

[Formulation Example 6] Emulsion compound (1)
─────── 4 parts acetochlor ─────── 32 parts xylene ──────── 49
Part methylnaphthalene ──────── 10
Department Solpol 2680 ────────
5 parts or more are uniformly mixed and dissolved to form an emulsion.

[Formulation Example 7] Granule Compound (1)
───────0.7 Part Alacrol ─────── 10 Part DB
SN ──────── 3
Part (sodium dodecylbenzenesulfonate) Epoxidized soybean oil ─────── 1
Part bentonite ──────── 30
Part Tarc ──────
- 55.3 parts or more were uniformly mixed and pulverized, a small amount of water was added and stirred, granulated using an extrusion granulator, and after granulation, the mixture was dried to obtain granules.

[Formulation Example 8] Granule Compound (1)
──────── 1 part metolachlor ─────── 10 part D
BSN ──────── 3
Epoxidized soybean oil ────────
Part 1 Bentonite ──────
─ 30 parts talc
─────── 55 parts or more are uniformly mixed and pulverized, a small amount of water is added and stirred, and granulated using an extrusion granulator.
After granulation, the mixture was dried to obtain granules.

[Formulation Example 9] Granule Compound (1)
─────── 1 part acetochlor ─────── 8 parts DBSN ───────
3 parts epoxidized soybean oil ────────
Part 1 Bentonite ──────
── 30 parts talc
──────── 57 parts or more were uniformly mixed and pulverized, a small amount of water was added and stirred, and the mixture was granulated using an extrusion granulator, and after granulation, it was dried to obtain granules.

[Test Example] Weeding effect test by pre-germination soil treatment Sterilized upland soil is placed in a plastic box measuring 30 cm long, 30 cm wide and 10 cm deep, and seeds of corn, foxtail grass, Japanese crocodile, Japanese cabbage, and white cabbage are placed in spots respectively. They were planted in shapes and covered with soil. The day after sowing, the soil was treated with a water spray of 5 l/a. The chemical solution used for spraying was a wettable powder suitably prepared according to Formulation Examples 1, 2, and 3, diluted with water, and sprayed using a small sprayer. Three weeks after spraying the chemical solution, the above-ground fresh weight of each weed was measured, and the suppression rate (%) was calculated using the following formula.

[0022]

[Equation 1] Suppression rate (%) = (1 - above-ground fresh weight of treated area / above-ground fresh weight of non-treated area) x 100 Table 1 shows the inhibition rate of compound (1), alachlor, metolachlor and acetochlor. The herbicidal effect test results of single agents are shown. Table 2 shows the herbicidal effect test results of the compositions of compound (1), alachlor, metolachlor, and acetochlor.

[0023] The symbols in the table represent the following. A: Corn, B: Wild foxtail, C: Ichibi, D
: Aobyu, E: Shiroza

[0024]

[Table 1]

[0025]

[Table 2] Table 2 Actual and expected values of herbicidal effect of mixture (inhibition rate, %) ────────────────
────────────────── Each active ingredient
A B
Processing amount of CDE Actual period Actual period
Actual period Actual period Actual period
(g/ha)
Measurement standby value
value value value value value value value
Value Value Value────────────────
────────────────── Alachlor + Compound (1) 120 + 10 0 0
100 81 86 57 10
0 75 100 89 120 + 3
0 0 0 100 95
100 91 100 96 10
0 98 360 + 10
0 0 100 94 96 64
100 92 100 97 360
+ 30 0 0 10
0 98 100 92 100 99
100 99────────────────
──────────────────── Metolachlor + Compound (1) 120 + 10 0 0
100 88 83 55 10
0 69 100 85 120 + 3
0 0 0 100 97
100 90 100 95 10
0 97 360 + 10
0 0 100 95 93 62
100 83 100 96 360
+ 30 0 0 10
0 99 100 92 100 97
100 99────────────────
──────────────────── Acetochlor + Compound (1) 80 + 10 0 0
100 84 91 60 10
0 82 100 89 80 + 3
0 0 0 100 96
100 91 100 97 10
0 98 240 + 10
0 0 100 95 100 81
100 95 100 98 240
+ 30 0 0 10
0 99 100 96 100 99
100 100────────────────
──────────────────── (In the table, the expected value indicates the value obtained from the Colby equation.) As is clear from the above results, the present invention The herbicidal effect of the composition is not limited to the sum of compound (1) and alachlor, metolachlor, or acetochlor, but also has synergistic herbicidal activity, and furthermore, it has a synergistic herbicidal activity at a low dose. Target weeds can be selectively controlled.

Claims (1)

[Claims] [Claim 1] A compound represented by formula (1) and a compound represented by formula (2)
), a compound represented by formula (3), and a compound represented by formula (4), as an active ingredient. [Chemical formula 1]