JP3799669B2 - Herbicidal composition - Google Patents

Description

【００１９】
【表２】

【００２０】
以上の結果から明らかな様に、（Ａ）と（Ｂ）とを混合した場合のそれぞれの合計の除草効果にとどまらず、相乗的な効果を有しており、低薬量で対象雑草を防除することができる。[0001]
BACKGROUND 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]
[Prior art and problems]
Many years of herbicide research and development have been put to practical use, and these herbicides have contributed to labor saving in weed control work and improved productivity of agricultural and horticultural crops. Even today, there is a demand for the development of new drugs with better herbicidal properties. Especially as herbicides for agriculture and horticulture, only target weeds are controlled selectively and at low doses without causing phytotoxicity to cultivated crops. Desirably, existing drugs do not necessarily meet this requirement.
[0003]
Compared to conventional herbicides, carfentrazone (generic name) has excellent herbicidal effects on various broad-leaved weeds at low doses in terms of foliage treatment, but has sufficient effects on grass weeds that have grown. It may not be possible.
On the other hand, glyphosate (generic name) is already used in practical use in the form of various salts and is characterized by having an excellent foliage treatment effect. However, a high dose is required for foliage treatment.
[0004]
[Means for Solving the Problems]
The present invention is a herbicidal composition (hereinafter referred to as the present invention composition) containing carfentrazone (A) and glyphosate (B) as active ingredients.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
(B) includes various salts, such as metal salts and amine salts. Examples of the metal salt include sodium salt and potassium salt, and examples of the amine salt include ammonium salt, isopropylamine salt and trimesium salt.
The composition of the present invention contains 0.1 to 1000 parts by weight of (B) per 1 part by weight of (A). Preferably, 1 part by weight of (A) contains 1 to 100 parts by weight of (B).
[0006]
The treatment dose of the composition of the present invention depends on the type of a specific target plant to be inhibited from growth, but as an active ingredient, (A) is 0.1 to 1000 g / ha, preferably 10 to 100 g / ha. ha and (B) is 10 to 10000 g / ha, preferably 100 to 1000 g / ha.
The composition of the present invention not only provides the herbicidal effects of (A) and (B) contained in the composition of the present invention in an additive manner, but also has a synergistic action. The amount can be reduced.
[0007]
At the same time, (A) has an action of accelerating the expression of the herbicidal effect of (B).
The composition of the present invention can be applied to the control of various weeds in agricultural and horticultural fields such as orchards and non-agricultural fields such as playgrounds, vacant land, forest land, tank yards, and track ends, and exhibits a great economic effect in controlling weeds. Moreover, this invention composition can control the weed which has already generate | occur | produced by spraying before sowing, when cultivating various crops, such as soybean and corn, without plowing.
[0008]
The composition of the present invention is usually used in the form of a preparation mixed with a carrier comprising a solid or liquid diluent, but 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, and water, alcohols (isopropanol, butanol, benzyl alcohol, furfuryl alcohol, etc.), aromatic hydrocarbons (toluene, xylene, etc.) Liquid carriers such as chlorinated hydrocarbons (chlorobenzene, etc.), ethers (anisole, etc.), ketones (cyclohexanone, isophorone, etc.), esters (butyl acetate, etc.) and acid amides (N-methylpyrrolidone, etc.) can give.
[0009]
Examples of the surfactant include anionic surfactants such as sodium alkylaryl sulfonate, sodium alkylnaphthalene sulfonate, sodium dialkyl oxalate, polyoxyethylene alkylaryl ether sulfate, alkyl-type phosphate ester and alkylphenol-type phosphate ester, Nonionic surfactants such as oxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene (propylene) fatty acid ester, sorbitan monooleate and polyoxyethylene sorbitan monolaurate, and plants such as polyoxyethylene hydrogenated castor oil Derivatives.
[0010]
The composition of the present invention may be added with an emulsifier, a wetting agent, a dispersing agent, a binder, a penetrating agent, a spreading agent, a stabilizer, a disintegrating agent, etc. It can be put to practical use in any dosage form such as an agent, suspension, or gel.
At this time, it is possible to use a mixture with a plurality of known agricultural chemicals at the same time.
Next, formulation examples of the preparation when the compound of the present invention is used are shown. However, the formulation examples of the present invention are not limited to these. In the following formulation examples, “parts” means parts by weight.
[Wettable powder]
(A) + (B) 5-80 parts solid support 10-85 parts surfactant 1-10 parts others 0-5 parts Others include, for example, anti-caking agents.
[Milk]
(A) + (B) 1-30 parts Liquid carrier 30-95 parts Surfactant 1-15 parts Others 0-10 parts Others include, for example, stabilizers.
[Flowable agent]
(A) + (B) 5-70 parts Liquid carrier 15-65 parts Surfactant 0.1-12 parts Others 0.1-30 parts Others include, for example, antifreezing agents, thickeners and the like.
[Granular wettable powder (dry flowable)]
(A) + (B) 20-90 parts solid support 9-60 parts Surfactant 1-20 parts Others 0-40 parts Others include, for example, disintegrants.
[0011]
【Example】
EXAMPLES Hereinafter, although an Example demonstrates this invention composition more concretely, the compound in this invention, a manufacturing amount, a dosage form, etc. are not limited only to an Example. “Parts” means all parts by weight.
[Formulation Example 1] Flowable Compound (A) 2 parts Glyphosate 30 parts Agrisol S-711 8 parts (Nonionic surfactant: Kao Corporation trade name)
Lnox 1000C 0.5 part (anionic surfactant: Toho Chemical Co., Ltd. trade name)
20 parts of 1% Rhodopol water (Thickener: trade name of Lumpurlan)
8 parts of ethylene glycol (freezing agent)
31.5 parts or more of water is uniformly mixed to obtain a flowable agent.
[0012]
[Formulation Example 2] Granular wettable powder compound (A) 3 parts Glyphosate 72 parts Isoban No. 1 10 parts (anionic surfactant: Kuraray isoprene Chemical Co., Ltd. trade name)
Vanillex N 5 parts (anionic surfactant: Sanyo Kokusaku Pulp Co., Ltd. trade name)
Carplex # 80 10 parts or more are uniformly mixed and pulverized to obtain a granular wettable powder.
[0013]
Next, when (A) and (B) are mixed, the test example which showed the effect exceeding the effect anticipated from the effect of single agents is shown.
The synergistic herbicidal effect of the herbicide mixture can be explained as follows. That is, an individual active compound often exhibits a defect in its herbicidal activity, in which case the herbicidal activity combining the two active compounds is a simple sum of the activities of each of the two compounds ( This is called synergy when it is greater than the expected activity. The activity expected by a specific combination of two herbicides can be calculated as follows. (See Colby S.R., Calculation of Synergistic and Antagonistic Responses of Herbicide Combinations, Weed, 15, 20-22 (1967))
[0014]
C = α + B− (α · β / 100)
α: Inhibition rate when herbicide A is treated in an amount of akg / ha β: Inhibition rate when herbicide B is treated in an amount of bkg / ha C: Herbicide A is akg / ha, herbicide B is It can be said that the activity of the combination shows a synergistic effect if the inhibition rate expected when treated at an amount of bkg / ha, that is, the actual inhibition rate is larger than the above calculation.
[0015]
[Test Example 1] Herbicidal effect test by growing season treatment A sterilized field soil mixed with chemical fertilizer and compost was placed in a plastic 4-inch pot, and this was seeded with nobies or camellias. The plants were grown in a greenhouse for 20 days and tested at a plant height of 8-15 cm. (A) is an appropriately prepared wettable powder, (B) (generic name glyphosate) is diluted with a predetermined concentration using each commercially available aqueous solvent, and 0.05% of Nippol is used as a spreading agent. It mixed so that it might become. A spray gun was used for spraying, and the treatment was started at a spraying water amount of 5 liters / ha. Two weeks after spraying the drug, the above-ground living weight of each weed was measured, and the inhibition rate (%) was determined by the following formula.
[0016]
Suppression rate (%) = (1-treated body weight / untreated body weight) × 100
Table 1 shows the herbicidal effects of the single agents (A) and (B).
Table 2 shows the herbicidal effect when (A) and (B) are mixed.
(In the table, E represents an actual measurement value, C represents an expected value, and the expected value represents a value obtained from the Colby equation.)
In addition, the symbol in a table | surface shows the following.
[0017]
N: Novier, H: Hakidamegiku [0018]
[Table 1]

[0019]
[Table 2]

[0020]
As is clear from the above results, not only the total herbicidal effect when (A) and (B) are mixed, but also has a synergistic effect, and the target weed is controlled at a low dose. can do.

Claims (1)

A herbicidal composition containing carfentrazone and glyphosate as active ingredients.