JP2974806B2 - Herbicide composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a herbicidal composition, and more particularly, to a herbicide which has an excellent herbicidal effect on annual and perennial weeds and has markedly improved safety against crops. It relates to a composition.

[0002]

2. Description of the Related Art It has been disclosed in Japanese Patent Application Laid-Open No. 1-250365 or Japanese Patent Application No. 22022016 that a bispyrimidinyloxybenzoic acid derivative which is one of the active ingredients of the herbicidal composition of the present invention has herbicidal activity. Are listed.
Further, the other active ingredient of the herbicidal composition of the present invention, 2,4-dichlorophenoxyacetic acid or a salt or ester thereof (hereinafter collectively referred to as 2,4-D), or 2-methyl-4-acid Chlorphenoxyacetic acid or a salt or ester thereof (hereinafter, collectively referred to as MCP) is
It has already been widely used as a herbicide for agricultural land or non-agricultural land (Agricultural Chemicals Manual, 1989, p. 451).

[0003]

At present, a large number of herbicides are used as field-acting herbicides. However, the types of weeds to be controlled are wide-ranging, and the occurrence is long. There is a need for a herbicide that has a higher herbicidal effect and a broader herbicidal spectrum, and that is 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 against rice, wheat and the like. However, when used for wheat, there is a problem that chemical damage may occur depending on cultivation conditions, wheat varieties and the like. An object of the present invention is to reduce the phytotoxicity caused by the bispyrimidinyloxybenzoic acid derivative while maintaining a herbicidal effect by using a certain bispyrimidinyloxybenzoic acid derivative in combination with 2,4-D or MCP. Another object of the present invention is to provide a herbicide composition that can be safely used for wheat.

[0004]

The herbicidal composition of the present invention has the general formula

[0005]

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(Wherein R represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium ion, an organic ammonium ion, a CH ₂ OCOC ₄ H ₉ -t group or a CH (CH ₃ ) COOC ₂ H ₅ group) ) And one selected from 2,4-D or MCP as active ingredients.

The bispyrimidinyloxybenzoic acid derivative represented by the above general formula [I], which is one of the active ingredients of the herbicidal composition of the present invention, is exemplified in Table 1. The compound numbers will be referred to in the following description.

[0008]

[Table 1]

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

The mixing ratio of the two active ingredients of the herbicidal composition of the present invention can be varied in a wide range, but the compound represented by the general formula [I] and 2,4-D are mixed. When the former is 1 part by weight, the latter is 1 to 1
00 parts by weight, preferably 2 to 50 parts by weight are suitable.
The mixing ratio of the compound represented by the general 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.

The herbicidal composition of the present invention may be applied with two kinds of compounds as they are, but usually contains a carrier, a surfactant, a dispersant, an auxiliary agent and the like which are generally used in formulating agricultural chemicals. Then, it is preferable to apply and formulate into various forms such as wettable powders, granules, emulsions or suspensions.

[0012] Carriers used in the formulation include
For example, Siegrite, Talc, Bentonite, Clay,
Solid carriers such as kaolin, diatomaceous earth, white carbon, vermiculite, slaked lime, silica sand, ammonium sulfate, urea, etc., and liquid carriers such as isopropyl alcohol, xylene, cyclohexanone, methylnaphthalene, acetone, isophorone, dimethyl sulfoxide, acetonitrile, vegetable oil, water, etc. Can be

Examples of the surfactant and dispersant include alcohol sulfates, alkylaryl sulfonates, lignin sulfonates, polyoxyethylene glycol ethers, polyoxyethylene alkylaryl ethers, polyoxyethylene sorbitan monoalkylates and the like. Is raised. Examples of the adjuvant include carboxymethyl cellulose, polyethylene glycol, gum arabic and the like.

[0014] The herbicidal composition of the present invention can be expected to enhance the herbicidal effect when used in admixture with other herbicides. Further, if necessary, it can be used by mixing with an insecticide, a bactericide, a plant growth regulator, a fertilizer and the like.

The herbicidal composition of the present invention is prepared by diluting the preparation obtained as described above to an appropriate concentration with water or the like and spraying or applying directly. The application rate of the herbicidal composition of the present invention varies depending on the target weed, the type of crop, the weather conditions, the formulation of the composition, the mixing ratio of the active ingredients, the method of application, the time of application, and the like. 10g-2 per hectare
000g, preferably 50-70 in combination with 2,4-D
0 g and 50 to 1300 g are suitable for mixing with MCP. The herbicidal composition of the present invention is most suitable for controlling weeds in barley, but may be applied to other field crops or paddy rice.

[0016] The herbicidal composition of the present invention is useful for producing barnyardgrass, crabgrass, oakgrass, enokorogosa, sparrow-nosed plow, wild-flowered pomegranate, spruce-spotted crab, which occur in crop fields.
Oats, Italian ryegrass, chickweed, naps,
Pufferfish such as Yaegura, Ino chamomile, Ooinoufuguri, etc., violets, Ooinuta, Aoubiyu, Shiroza, Akaza, Ichibi, American stag deer, Ebisugusa, Noasagao, Onamimi, Kogomegatsuri, Meriken swordfish, Ishigura, Ishigura, Ichigusa, Ishigrass Weeds and perennial weeds such as nutsedge, Johnsongrass, goosegrass, and barley can be effectively controlled from the outbreak to the growing season, and the herbicidal effect is reduced even when used under adverse conditions where phytotoxicity to wheat is unavoidable. However, it has the characteristic that only the chemical damage to wheat is remarkably reduced. In addition, 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 described, but the present invention is not limited to this range. In addition, 2,4-D is a typical example of an amine salt, and MCP is a sodium salt as a typical example. However, the present invention is not limited to this, and other forms can be similarly implemented. Example 1 (liquid) 2 parts by weight of the compound (2), 25 parts by weight of a 2,4-D amine salt, 5 parts by weight of polyoxyethylene lauryl ether and 68 parts by weight of water are uniformly stirred to obtain a liquid.

Example 2 (solution) 0.5 part by weight of compound (2), MCP sodium salt 12.5
Parts by weight, polyoxyethylene nonyl phenyl ether 5
Parts by weight and 82 parts by weight of water are uniformly dissolved to obtain a liquid preparation.

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 dinaphthylmethanedisulfonate, 3 parts by weight of sodium ligninsulfonate, white carbon 5 parts by weight and 63 parts by weight of diatomaceous earth are uniformly mixed and pulverized to obtain a wettable powder.

Example 4 (Wettable powder) 1 part by weight of the 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 diatomaceous earth 64
The parts by weight are uniformly mixed and pulverized to obtain a wettable powder.

Next, the effects of the herbicidal composition of the present invention will be specifically described with reference to test examples. Test Example 1 (field foliage treatment) In each pot (800 cm ² ) filled with soil, chickweed (STE), yaemgra (GAL), violet (VI)
O), dog chamomile (MAT), wild turtle (ALO), wheat (Avalon cultivar: TRZ-1, Huntsman cultivar: TRZ-2) and barley (HOR) were sown and covered with 0.5 to 1 cm. . The pot was allowed to stand outdoors and grown for two months. Thereafter, a predetermined amount of the wettable powder prepared in Example 3 was diluted with 250 liters of water per hectare (addition of 0.1% of a spreading agent), and uniformly spread on the foliage surface with a small sprayer. The plant height of each plant during the chemical treatment was 28 to 36 cm for wheat, 20 to 32 cm for barley, and 4 to 15 cm for weeds. On the 40th day after the chemical treatment, the above-ground live weight of the test plant was measured, and the growth inhibition rate (%) with respect to the untreated plot was calculated. The results are shown in Table 2.

[0022]

[Table 2]

Test Example 2 Soil-filled pots (800 cm ² ) were filled with chickweed (STE), oinou nofuguri (VER), yaemgra (GAL), violet (VIO), and inucamitsure (MA).
T), seedlings (ALO), wheat (Avalon cultivar: TRZ-1, Huntsman cultivar: TRZ-2) and barley (HOR) were sown and covered with 0.5 to 1 cm of soil. The pot was allowed to stand outdoors and grown for two months. Thereafter, a predetermined amount of the wettable powder prepared according to Example 4 was diluted with 250 liters of water per hectare (0.1% of spreading agent).
Addition) and sprayed evenly on the foliage surface with a small sprayer. In addition, the plant height of each plant at the time of chemical treatment is wheat 25-30c
m, barley 10-12 cm, and weeds 2-6 cm. On the 40th day after drug treatment, the above-ground living weight of the test plant was measured,
The growth inhibition rate (%) for the untreated plot was calculated. The results are shown in Table 3.

[0024]

[Table 3]

[0025]

As described above, the herbicidal composition of the present invention comprises 2,4-D or MCP selected from bispyrimidinyloxybenzoic acid derivatives represented by the general formula [I].
By blending one kind selected from the group below, even if the bispyrimidinyloxybenzoic acid derivative is used under conditions where it is difficult to avoid the phytotoxicity to wheat, the phytotoxicity of each active ingredient is not reduced. Is selectively and remarkably reduced.

Claims (1)

(57) [Claims] 1. A compound of the general formula (Wherein R is a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an ammonium ion, an organic ammonium ion, a CH ₂ OCOC ₄ H ₉ -t group or CH (CH ₃ ) C
OOC ₂ H ₅ group. A) selected from bispyrimidinyloxybenzoic acid derivatives and 2,4-dichlorophenoxyacetic acid or a salt or ester thereof, or 2-methyl-4-chlorophenoxyacetic acid or a salt or ester thereof A herbicidal composition comprising one selected kind as an active ingredient.