JPH04275201A - Herbicide composition - Google Patents

Abstract

PURPOSE:To provide the title composition capable of selectively, significantly reducing the chemical injuries on barley, wheat, etc., and controlling a wide range of weeds, comprising as active ingredients a dispymidinyloxybenzoic acid derivative and 2,4-D or MCP. CONSTITUTION:The objective composition comprising as active ingradients (A) a compound of the fomula [R is H, alkali metal, alkaline earth metal, ammonium ion, ogranoammonium ion, CH2OCOC4H9-t or CH(CH3)COOC2H5] and (B) a compound selected from 2,4-dichlorophenoxyacetic acid (2,4-D), 2- methyl-4-chlorophenoxyacetic acid (MCP), their salts and their esters at a level of pref. 2-50 pts.wt. (for 2,4-D) or 4-100 pts.wt. (for MCP) per pt.wt. of the component A. The composition has outstanding herbicidal effects on both annual and perennial weeds.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a herbicide composition, and more particularly to a herbicide that exhibits excellent herbicidal effects against annual and perennial weeds and has significantly improved safety for crops. The present invention relates to a composition.

0002

[Prior Art] It is disclosed in JP-A No. 1-250365 or Japanese Patent Application No. 2-220616 that the bispyrimidinyloxybenzoic acid derivative, which is one of the active ingredients of the herbicidal composition of the present invention, has herbicidal activity. Are listed. In addition, 2 which is the other active ingredient of the herbicide composition of the present invention
, 4-dichlorophenoxyacetic acid or its salt or its ester (hereinafter collectively referred to as 2,4-D), or 2-methyl-4-chlorophenoxyacetic acid or its salt or its ester (hereinafter collectively referred to as MCP) has already been widely used as a herbicide for agricultural land or non-agricultural land (Pesticide Handbook 1989, p. 451).

0003

[Problems to be Solved by the Invention] Currently, many herbicides are used as field herbicides, but the types of weeds to be controlled are wide-ranging, and their emergence continues over a long period of time. There is a need for herbicides that have higher herbicidal effects, have a broader herbicidal spectrum, and are highly safe for crops. The bispyrimidinyloxybenzoic acid derivative, which is one of the active ingredients of the herbicidal composition of the present invention, has a high herbicidal effect and is highly safe for paddy rice, wheat, etc. However, when used on wheat, there is a problem in that phytotoxicity may occur depending on the cultivation conditions, wheat variety, etc. The purpose of the present invention is to reduce the phytotoxicity caused by the bispyrimidinyloxybenzoic acid derivative while maintaining the herbicidal effect by using a certain bispyrimidinyloxybenzoic acid derivative in combination with 2,4-D or MCP. The object of the present invention is to provide a herbicide composition that can be safely used on wheat.

0004

[Means for Solving the Problems] The herbicidal composition of the present invention has the general formula

[0005]

[Case 2]

(Wherein, R represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium ion, an organic ammonium ion, a CH2OCOC4H9-t group or a CH(CH3)COOC2H5 group.) It contains one selected from pyrimidinyloxybenzoic acid derivatives and one selected from 2,4-D or MCP as active ingredients.

Examples of the bispyrimidinyloxybenzoic acid derivative represented by the general formula [I], which is one of the active ingredients of the herbicidal composition of the present invention, are shown in Table 1. In addition, the compound number will be referred to in the following description.

[0008]

[Table 1]

Other active ingredients of the herbicidal composition of the present invention include 2,4-dichlorophenoxyacetic acid, a salt thereof, or an ester thereof, which can be produced by a known method.
-Methyl-4-chlorophenoxyacetic acid, a salt thereof, or an ester thereof. Examples of the salt include alkali metal salts such as sodium salts and potassium salts, alkaline earth metal salts such as calcium salts, and inorganic or organic ammonium salts such as amine salts and dimethylamine salts. In addition, esters include ethyl ester, butyl ester,
Examples include isopropyl ester, allyl ester, isooctyl ester, and the like.

Although the mixing ratio of the two active ingredients in the herbicidal composition of the present invention can be varied within a wide range, it is possible to mix the compound represented by the general formula [I] with 2,4-D. In cases where the latter is 1 to 10 parts by weight of the former,
0 parts by weight, preferably 2 to 50 parts by weight are suitable. The appropriate mixing ratio of the compound represented by formula [I] and MCP is 1 to 200 parts by weight, preferably 4 to 100 parts by weight, per 1 part by weight of the former.

[0011] Although the two types of compounds may be applied as they are to the herbicidal composition of the present invention, carriers, surfactants, dispersants, adjuvants, etc. commonly used in the formulation of agricultural chemicals are usually added. It is preferable to formulate and apply it in various forms such as wettable powders, granules, emulsions, or suspensions.

[0012] As carriers used in formulation,
For example, Sieglite, talc, bentonite, clay,
Examples include solid carriers such as kaolin, diatomaceous earth, white carbon, vermiculite, slaked lime, silica sand, ammonium sulfate, and urea, and liquid carriers such as isopropyl alcohol, xylene, cyclohexanone, methylnaphthalene, acetone, isophorone, dimethyl sulfoxide, acetonitrile, vegetable oil, and water. It will be done.

[0013] Examples of surfactants and dispersants include alcohol sulfate ester salts, alkylaryl sulfonates, lignin sulfonates, polyoxyethylene glycol ethers, polyoxyethylene alkylaryl ethers, polyoxyethylene sorbitan monoalkylates, etc. can be given. Examples of the adjuvant include carboxymethyl cellulose, polyethylene glycol, and gum arabic.

[0014] The herbicidal composition of the present invention can be expected to have an enhanced herbicidal effect when used in combination with other herbicides. Further, if necessary, it can be used in combination with an insecticide, a fungicide, a plant growth regulator, a fertilizer, etc.

The herbicidal composition of the present invention is prepared by diluting the above-obtained preparation with water or the like to an appropriate concentration and then spraying or directly applying it. The application amount of the herbicide composition of the present invention varies depending on the target weed, the type of crop, weather conditions, the formulation form of the composition, the mixing ratio of the active ingredients, the method of application, the timing of application, etc. 10g-20 per hectare
00g, preferably 50-700 when mixed with 2,4-D
g, 50 to 1300 g is appropriate when mixed with MCP. The herbicide composition of the present invention is most suitable for weed control in wheat, but may also be applied to weed control in other field crops or paddy rice.

[0016] The herbicide composition of the present invention can be used to control barnyard grasses, Japanese grasshopper, Japanese grasshopper, Japanese foxtail grass, Japanese grasshopper, Japanese grasshopper, Japanese grasshopper, and Japanese grasshopper that occur in crop fields.
Oats, Italian ryegrass, chickweed, shepherd's purse,
Annuals such as pufferfish, violets, Japanese knotweed, Japanese violets, Japanese violet, Japanese staghorn, Japanese redweed, American king deer, Ebisugusa, Noassa glories, Japanese fir, Japanese cypress, American chili grass, witch grass, Japanese chahiki, Japanese grasshopper, American helium, etc. To be able to effectively control weeds and perennial weeds such as porcupine grass, johnson grass, silver grass, and grasshopper from the time of emergence to the growing season, and to reduce the herbicidal effect even when used under adverse conditions where chemical damage to wheat is difficult to avoid. It is characterized by significantly reducing only the chemical damage to wheat. Furthermore, the herbicidal composition of the present invention can effectively control weeds that are insufficiently controlled when each active ingredient is used alone.

[0017]

[Examples] Next, examples of the herbicidal composition of the present invention will be given, but the present invention is not limited to this scope. In addition, although 2,4-D is an amine salt and MCP is a sodium salt as representative examples, the present invention is not limited to these and other forms can be used in the same manner. Example 1 (Liquid) 2 parts by weight of compound (2), 25 parts by weight of 2,4-D amine salt, 5 parts by weight of polyoxyethylene lauryl ether, and 68 parts by weight of water are uniformly stirred to prepare a liquid.

Example 2 (Liquid) 0.5 parts by weight of compound (2), MCP sodium salt 12.
5 parts by weight of polyoxyethylene nonylphenyl ether and 82 parts by weight of water are uniformly dissolved to prepare a liquid agent.

Example 3 (Wettable powder) 2 parts by weight of compound (2), 25 parts by weight of 2,4-D amine salt, 2 parts by weight of sodium dinaphthylmethane disulfonate,
3 parts by weight of sodium ligninsulfonate, 5 parts by weight of white carbon, and 63 parts by weight of diatomaceous earth are uniformly mixed and ground to obtain a wettable powder.

Example 4 (Wettable powder) 1 part by weight of compound (2), 25 parts by weight of MCP sodium salt, 3 parts by weight of sodium methylnaphthalenesulfonate formalin condensate, 2 parts by weight of sodium dodecylbenzenesulfonate, White Carbon 5 Parts by weight and 64 parts by weight of diatomaceous earth are uniformly mixed and ground to obtain a wettable powder.

Next, the effects of the herbicidal composition of the present invention will be specifically explained with reference to test examples. Test example 1 (field crop foliage treatment) Chickweed (chickweed) was placed in each pot (800 cm2) filled with soil.
STE), Yaemugura (GAL), Sumire (VIO),
Dogtail (MAT), Japanese Sparrow (ALO)
), wheat (Avalon variety: TRZ-1, Huntsman variety: TRZ-2), and barley (HOR) seeds were sown,
It was covered with soil to a thickness of 0.5 to 1 cm. Place the pot outdoors, and
It was cultivated for a month. Thereafter, a predetermined amount of the wettable powder prepared in Example 3 was diluted with 250 liters of water per hectare (0.1% spreading agent was added) and uniformly sprayed onto the foliage surface using a small sprayer. The plant height of each plant upon chemical treatment was 28 to 36 cm for wheat, 20 to 32 cm for barley, and 4 to 15 cm for weeds.
It was cm. On the 40th day after chemical treatment, the weight of the above-ground parts of the test plants was measured, and the growth inhibition rate (%) compared to the untreated area was determined.
was calculated. The results are shown in Table 2.

[0022]

[Table 2]

Test Example 2 Each pot (800 cm2) filled with soil was planted with chickweed (
STE), Giant dogfish (VER), Yaemugura (
GAL), violet (VIO), dog violet (MAT)
Seeds of , ALO (ALO), wheat (Avalon variety: TRZ-1, Huntsman variety: TRZ-2), and barley (HOR) were sown and covered with soil to a thickness of 0.5 to 1 cm. The pot was placed outdoors and grown for two months. Thereafter, a predetermined amount of the wettable powder prepared in Example 4 was diluted with 250 liters of water per hectare (0.1% spreading agent was added) and uniformly sprayed onto the foliage surface using a small sprayer. The plant height of each plant at the time of chemical treatment was 25 to 30 cm for wheat, 10 to 12 cm for barley, and 2 to 6 cm for weeds. On the 40th day after the chemical treatment, the weight of above-ground parts of the test plants was measured, and the growth inhibition rate (%) was calculated relative to the untreated plot. The results are shown in Table 3.

[0024]

[Table 3]

[0025]

Effects of the Invention As described above, the herbicidal composition of the invention contains 2,4-D or MCP in one selected from the bispyrimidinyloxybenzoic acid derivatives represented by the general formula [I].
By blending one selected from the following, even when the bispyrimidinyloxybenzoic acid derivative is used under conditions where it is difficult to avoid phytotoxicity to wheat, the herbicidal effect of each active ingredient will not be reduced, and the phytotoxicity will be reduced. It has the effect of selectively and significantly reducing drug damage.

Claims (1)

[Claims] Claim 1: General formula [Formula 1] (wherein R is a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium ion, an organic ammonium ion, a CH2OCOC4H9-t group, or a CH(CH
3) Shows COOC2H5 group. ) and 2 selected from the bispyrimidinyloxybenzoic acid derivatives represented by
1 selected from 4-dichlorophenoxyacetic acid or its salt or its ester, or 2-methyl-4-chlorophenoxyacetic acid or its salt or its ester
A herbicidal composition characterized by containing seeds as an active ingredient.