JPH06271409A - Herbicide composition - Google Patents

Abstract

PURPOSE:To obtain a herbicide composition capable of effectively controlling various harmful weeds, especially controlling weeds by scattering before sowing in the non-tilled cropping of soybean, corn, etc., by mixing two kinds of known herbicidal active components. CONSTITUTION:The herbicide composition is produced by combining a compound of formula I (R<1> is H or halogen; R<2> is halogen; R<3> is 1-4C alkyl or 1-3C haloalkyl) with the compound of formula II (common name: paraquat). The amount of paraquat is preferably 0.1-100 pts.wt., especially 0.5-20 pts.wt., based on 1 pt. wt. of the compound of formula I. For example, R1 is F, R2 is Cl and R3 is Et in the formula I. The herbicide composition can control the weeds by scattering before the sowing of soybean or corn and keep the controlled state of the weeds over a long period after sowing. The composition exhibits synergistic herbicidal effect and controls the objective weed at a low rate of application. It can be applied to various crops.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a herbicidal composition for effectively controlling various harmful weeds by mixing two kinds of known herbicidal active ingredients. In particular,
When cultivating crops such as soybeans and corn without plowing, weeds are controlled by spraying these compositions before sowing, and it is possible to control weeds for a long time after sowing. I am trying.

[0002]

2. Description of the Related Art A wide variety of chemicals have been put to practical use through many years of research and development of herbicides, and these herbicides have contributed to labor saving of weed control work and improvement of productivity of agricultural and horticultural crops. Even today, there is a demand for the development of new agents with superior herbicidal properties, and as a herbicide for agricultural and horticultural use, it is possible to control only the target weeds selectively and at a low dose without damaging cultivated crops. It is desirable that
Existing drugs do not always meet this requirement.

(A) is a compound described in Japanese Patent Application Laid-Open No. 3-204865, which has a lower dose than conventional herbicides and has excellent herbicidal effects in soil treatment and foliar treatment, and in soil treatment. Although it is highly safe against crops such as soybeans and corn, the treatment of the growing season may not give a sufficient effect to weeds that have grown particularly well. on the other hand,
(B) (generic name paracot) is already used in practical situations and is characterized by having an excellent foliar treatment effect. However, (B) requires a high dose in the foliar treatment, and has no selectivity for specific crops.
The application of the crops during the growing period must be limited.

[0004]

[Chemical 2]

[0005]

The present invention comprises (A) and (B)

[0006]

[Chemical 3]

[In the formula, R ¹ represents a hydrogen atom or a halogen atom, R ² represents a halogen atom, and R ³ represents an alkyl group having 1 to 4 carbon atoms or a haloalkyl group having 1 to 3 carbon atoms. . ] The herbicide composition containing as an active ingredient. Examples of (A) include the following compounds. However, (A) is not limited to the following compounds.

Compound A1: R ₁ = F, R ₂ = Cl, R ₃ = Et Compound A2: R ₁ = F, R ₂ = Cl, R ₃ = Me Compound A3: R ₁ = F, R ₂ = Br, R ₃ = Me compound _{A4: R 1 = F, R} 2 = Cl, R 3 = Et compound _{A5: R 1 = F, R} 2 = Br, R 3 = Et present composition, (A) 1 part by weight Hit (B) 0.1
Including 100 parts by weight. Preferably, 0.5 to 20 parts by weight of (B) is included per 1 part by weight of (A).

The treatment dose of the composition of the present invention depends on the type of the particular target plant whose growth is to be inhibited, but the active ingredient (A) is 0.01 to 10 g / a, preferably 0. 1 to 5 g / a, and (B) is 0.1 to 100 g
/ A, preferably 1 to 50 g / a. The composition of the present invention has not only the additive herbicidal effect of each of (A) and (B) contained in the composition of the present invention but also a synergistic action, and each of them is used as a drug. The amount can be reduced.

At the same time, when cultivating crops such as soybeans and corns without plowing, weeds generated by spraying the composition of the present invention before sowing are controlled. Furthermore, it is possible to suppress the occurrence of weeds for a long period even after sowing, and it does not affect the growth of crops. In addition, it is also useful for various crops other than those mentioned above, other agricultural and horticultural fields such as orchards and playgrounds, vacant land, forest land,
It can be applied to control various weeds in non-cultivated land such as tank yards and track ends, and shows great economic effect in controlling weeds.

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 is preferably used in the form of a preparation further mixed with a surfactant. As the carrier, for example, clay, talc, bentonite, diatomaceous earth, a solid carrier such as white carbon, and water,
Alcohols (isopropanol, butanol, benzyl alcohol, furfuryl alcohol, etc.), aromatic hydrocarbons (toluene, xylene, etc.), chlorinated hydrocarbons (chlorobenzene, etc.), ethers (anisole, etc.),
Examples of the liquid carrier include ketones (cyclohexanone, isophorone, etc.), esters (butyl acetate, etc.), acid amides (N-methylpyrrolidone, etc.), and the like.

As the surfactant, for example, sodium alkylaryl sulfonate, sodium alkylnaphthalene sulfonate, sodium dialkyl succinate, polyoxyethylene alkylaryl ether sulfate,
Anionic surfactants such as alkyl phosphates and alkylphenol phosphates, polyoxyethylene alkyl ethers, polyoxyethylene alkylaryl ethers, polyoxyethylene (propylene) fatty acid esters, sorbitan monooleate, polyoxyethylene sorbitan monolaurate Nonionic surfactants such as, and plant derivatives such as polyoxyethylene hydrogenated castor oil.

To the composition of the present invention, if desired, an emulsifying agent, a wetting agent, a dispersing agent, a binder, a penetrating agent, a spreading agent, a stabilizer, etc. are added, and an emulsion agent, a liquid agent, a wettable powder, a powder agent, a granule agent, It can be put to practical use in any dosage form such as granules and suspensions. At this time, a mixture of a plurality of known pesticides can be used at the same time.
Next, formulation examples of the preparation when the compound of the present invention is used are shown.
However, the compounding examples of the present invention are not limited to these. In the following formulation examples, "part" means part by weight.

[Wettable powder] (A) + (B) 5 to 80 parts Solid carrier 10 to 85 parts Surfactant 1 to 10 parts Others 1 to 5 parts Other examples include anti-caking agents.

[Emulsion] (A) + (B) 1 to 30 parts Liquid carrier 30 to 95 parts Surfactant 5 to 15 parts

[Flowable agent] (A) + (B) 5 to 70 parts Liquid carrier 15 to 65 parts Surfactant 5 to 12 parts Other 5 to 30 parts Other examples include antifreezing agents, thickeners and the like. To be

[Granular wettable powder (dry flowable agent)] (A) + (B) 20 to 90 parts Solid carrier 9 to 60 parts Surfactant 1 to 20 parts

[0018]

EXAMPLES The composition of the present invention will be described in more detail with reference to the examples below, but the compounds, production amounts, dosage forms and the like in the present invention are not limited to the examples. In addition,
All "parts" mean parts by weight. [Formulation Example 1] Flowable compound A1 5 parts Paraquat 20 parts Agrisol S-711 8 parts (Nonionic surfactant: Kao Corporation trade name) Lunox 1000C 0.5 part (Anionic surfactant: Toho Chemical Industry ( Co., Ltd.) 1% Rhodopol Water 20 parts (Thickener: Lone Poulean Company trade name) Ethylene glycol 8 parts (Antifreeze) Water 38.5 parts Mix evenly to form a flowable agent.

[Formulation Example 2] Flowable compound A2 10 parts Paraquat 20 parts Agrisol S-711 8 parts (nonionic surfactant: Kao Corporation trade name) Lunox 1000C 0.5 part (anionic surfactant: Toho) Chemical Industry Co., Ltd. Product name: 1% Rhodopol Water 20 parts (Thickener: Lone Poulean Company product name) Ethylene glycol 8 parts (Antifreeze) Water 33.5 parts Mix evenly to form a flowable agent.

[Formulation Example 3] Flowable compound A3 10 parts Paraquat 25 parts Agrisol S-711 8 parts (nonionic surfactant: Kao Corporation trade name) Lunox 1000C 0.5 part (anionic surfactant: Toho) Chemical Industry Co., Ltd. product name 1% Rhodopol water 20 parts (Thickener: Lone Poulean Company product name) Ethylene glycol 8 parts (antifreeze) water 28.5 parts Mix evenly to form a flowable agent.

[Formulation Example 4] Flowable compound A4 10 parts Paraquat 20 parts Aglycol S-711 8 parts (nonionic surfactant: Kao Corporation trade name) Lunox 1000C 0.5 part (anionic surfactant: Toho) Chemical Industry Co., Ltd. Product name: 1% Rhodopol Water 20 parts (Thickener: Lone Poulean Company product name) Ethylene glycol 8 parts (Antifreeze) Water 33.5 parts Mix evenly to form a flowable agent.

[Formulation Example 5] Flowable compound A5 10 parts Paraquat 20 parts Agrisol S-711 8 parts (Nonionic surfactant: Kao Corporation trade name) Lunox 1000C 0.5 part (Anionic surfactant: Toho Chemical Industry Co., Ltd. Product name: 1% Rhodopol Water 20 parts (Thickener: Lone Poulean Company product name) Ethylene glycol 8 parts (Antifreeze) Water 33.5 parts Mix evenly to form a flowable agent.

[Formulation Example 6] Granular wettable powder Compound A1 15 parts Paraquat 60 parts Isoban No. 1 10 parts (anionic surfactant: Kuraray Isoprene Chemical Co., Ltd. trade name) Vanix N 5 parts (anionic surfactant: Sanyo Kokusaku Pulp Co., Ltd. trade name) Carplex # 80 10 parts Pulverize to give a granular wettable powder.

[Formulation Example 7] Granular wettable powder Compound A2 20 parts Paraquat 55 parts Isoban No. 1 10 parts (anionic surfactant: Kuraray Isoprene Chemical Co., Ltd. trade name) Vanix N 5 parts (anionic surfactant: Sanyo Kokusaku Pulp Co., Ltd. trade name) Carplex # 80 10 parts Pulverize to give a granular wettable powder.

[Formulation Example 8] Granular wettable powder Compound A3 20 parts Paraquat 45 parts Isoban No. 1 10 parts (anionic surfactant: Kuraray Isoprene Chemical Co., Ltd. trade name) Vanix N 5 parts (anionic surfactant: Sanyo Kokusaku Pulp Co., Ltd. trade name) Carplex # 80 20 parts Pulverize to give a granular wettable powder.

[Formulation Example 9] Granular wettable powder Compound A4 15 parts Paraquat 55 parts Isoban No. 1 10 parts (Anionic surfactant: Kuraray Isoprene Chemical Co., Ltd. trade name) Vanix N 5 parts (Anionic surfactant: Sanyo Kokusaku Pulp Co., Ltd. trade name) Carplex # 80 15 parts Pulverize to give a granular wettable powder.

[Formulation Example 10] Granular wettable powder Compound A5 25 parts Paraquat 50 parts Isoban No. 1 10 parts (anionic surfactant: Kuraray Isoprene Chemical Co., Ltd. trade name) Vanix N 5 parts (anionic surfactant: Sanyo Kokusaku Pulp Co., Ltd. trade name) Carplex # 80 10 parts Pulverize to give a granular wettable powder.

Next, when (A) and (B) are mixed,
The following is a test example showing an effect that exceeds the effect expected from the effects of single agents. The synergistic herbicidal effect of the herbicide mixture can be explained as follows. That is, an individual active compound often shows a defect in its herbicidal activity, but in that case, the herbicidal activity obtained by combining two active compounds is a simple sum of the respective activities of the two compounds ( When it is larger than the expected activity), this is called synergism. The expected activity of a particular combination of two herbicides can be calculated as follows. (Colby SR, Calculation of Synergistic and Antagonistic Responses of Herbicide Combinations, Weed, No.
Volume 15, 20-22 (1967)) C = α + β- (α ・ β / 100) α: Inhibitory rate when herbicide A is treated with akg / ha β: Herbicide B bkg Inhibition rate when treated with the amount of C / ha C: The expected inhibition rate when the herbicide A is treated with akg / ha and the herbicide B with the amount of bkg / ha That is, the actual inhibition rate is calculated from the above calculation. It can be said that the activities of the combination show a synergistic effect if they are large.

[Test Example 1] Herbicidal effect test by growing season treatment A sterilized field soil in which a chemical fertilizer and compost were mixed was placed in a plastic 4 inch pot, and a Nobie or a barley stalk was sown in this. Grows in a greenhouse for 20 days, plant height 8-15cm
The test was provided during the period. Compounds A1 to A5 are appropriately prepared wettable powders, compound B (paraquat) is a commercially available drug, and diluted and mixed to a predetermined concentration, and Nipol is 0.05% as a spreading agent. Mixed. A spray gun was used for spraying, and treatment was performed with a sprayed water amount of 5 liters / a. Two weeks after the chemical application, the above-ground fresh weight of each weed was measured, and the inhibition rate (%) was calculated by the following formula.

Inhibition rate (%) = (1-living weight of treated group / living weight of untreated group) × 100 Table 1 shows the herbicidal effect of the single agents of compounds A1 to A5 and B. Table 2 shows the herbicidal effect when the compounds A1 to A5 and B were mixed. (In the table, E is the measured value, C is the expected value, and the expected value is the value obtained from the Colby equation in the first half.
The symbols in the table indicate the following. N: Novier, H: Balloon

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

[0034]

[Table 4]

[0035]

[Table 5] As is clear from the above results, the herbicidal effect of the composition of the present invention is not limited to the sum of the cases where the compounds A1 to A5 and B are mixed, and has a synergistic herbicidal effect, which is further low. Target weeds can be controlled with a certain amount.

Front page continuation (72) Inventor Kimihiro Ishikawa 1470 Shiraoka, Shiraoka-cho, Minamisaitama-gun, Saitama Nissan Biochemical Research Institute

Claims (1)

[Claims] 1. (A) and (B) [In the formula, R ¹ represents a hydrogen atom or a halogen atom, and R ^1
2 represents a halogen atom, and R ³ represents an alkyl group having 1 to 4 carbon atoms or a haloalkyl group having 1 to 3 carbon atoms. ] The herbicidal composition containing as an active ingredient