JPH09278607A - Herbicide composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a herbicide composition capable of reducing even the phytotoxicity to transplanted paddy rice plant under a shallow planting condition by using quinoclamine effective for the control of algae, floating weeds, etc., in combination with a herbicide selected from 7 specific kinds of herbicides for paddy rice plant. SOLUTION: The compound of formula I is used together wit at least one kind of compound selected from the compounds of formula II, formula III, formula IV and formula V, imazosulfuron, azimsulfuron and cinosulfuron. The total amount of the latter compound group is preferably about 0.0001-10 pts.wt., especially about 0.001-0.5 pts.wt. based on 1 pt.wt. of the compound of formula I for producing a composition exhibiting excellent effect. The application rate of the composition is preferably 10-g to 10kg/ha for the compound of formula I and about 0.1g to 1-kg/ha for the latter compound group, especially 0.1-3kg/ha for the compound of formula I and about 1-300g/ha for the compound of formula II.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a herbicidal composition for paddy rice.

[0002]

2. Description of the Related Art At present, a number of compounds have been put into practical use as herbicides for paddy rice. However, existing chemicals do not cause harm to transplanted rice, and only select target weeds. Does not always completely meet the requirements for control. The compound represented by the following formula (A) (generic name: ACN, quinoclamin) has already been put to practical use as a herbicide for paddy rice effective for controlling algae, duckweed and the like. Further, the following formula (B) (generic name: pyrazosulfuron-ethyl), the following formula (C) (generic name: halosulfuron-methyl), the following formula (D) (generic name: imazosulfuron), the following formula (E) (generic name) : Azimuthulfuron), the following formula (F) (test name: AC-140), the following formula (G)
The compound represented by (Test name: HOE-404) and the following formula (H) (generic name: Cinosulfuron) is a compound that has already been put to practical use as a herbicide for paddy rice or is under development, and both are extremely Low doses produce effects on many weeds, but some weeds are less effective.

[0003]

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Further, although these compounds provide high safety to transplanted rice under normal planting conditions, they may cause phytotoxicity to paddy rice under adverse conditions such as extreme shallow planting and water leakage conditions.

[0005]

Means for Solving the Problems As a result of intensive investigations by the present inventors in view of the above problems, the compound represented by the formula (A) and the compounds represented by the formulas (B), (C), (D) and (E ), (F),
Compounds represented by (G) and (H) (hereinafter, these compounds are compound (A), compound (B), compound (C), compound (D), compound (E), compound (F),
It is called a compound (G) and a compound (H). It has been found that a herbicidal composition (hereinafter referred to as the composition of the present invention) characterized by containing at least one compound selected from the above as an active ingredient exhibits an excellent synergistic effect. It was

In the composition of the present invention, the compound (B),
(C), (D), (E), (F), (G) and (H)
At least one compound (A) selected from
By the addition of the above, not only the herbicidal effect is obtained additively but also a synergistic effect is obtained, and many weeds can be completely controlled with a low dosage. The usefulness of the composition of the present invention in practical situations is extremely high. At the same time, the compound (A) is a compound (B), (C) for transplanted rice under shallow planting conditions,
The chemical damage caused by (D), (E), (F), (G) and (H) is reduced.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The composition of the present invention exhibits suitable effects because of the compound (B) per 1 part by weight of the compound (A),
(C), (D), (E), (F), (G) or (H)
Is contained in an amount of 0.0001 to 10 parts by weight, but per 1 part by weight of the compound (A), the compounds (B), (C), (D),
0.001 to (E), (F), (G) or (H)
When it is contained in an amount of 0.5 part by weight, a further preferable effect can be expected.

The suitable treatment amount of the composition of the present invention depends on the kind of target weeds to be controlled, etc., but the active ingredient is 10 g to 10 kg / ha of compound (A), compound (B) and (C). ), (D), (E), (F), (G) or (H) is 0.1 g to 1 kg, the compound (A) is 0.1 kg to 3 kg / ha, the compound (B). Is 1
In the case of g to 300 g / ha, a more preferable effect can be expected.

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 the carrier include solid carriers such as clay, talc, pentonite, 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.),
Liquid carriers such as esters (such as butyl acetate) and acid amides (such as N-methylpyrrolidone) are exemplified.

Examples of the surfactant include 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 alkyl aryl ethers, polyoxyethylene (propylene) fatty acid esters, sorbitan monooleate and polyoxyethylene sorbitan monolaurate And plant derivatives such as polyoxyethylene hydrogenated castor oil.

The composition of the present invention may be added with an emulsifying agent, a wetting agent, a dispersing agent, a binder, a penetrating agent, a spreading agent, a stabilizer, a disintegrating agent, etc., if desired, and then an emulsion, a liquid agent, a wettable powder, a powder agent, or a granule It can be put to practical use in any dosage form such as a drug, granule, suspension or gel. At this time, it is also possible to mix and use a plurality of other herbicides, insecticides, fungicides, plant growth regulators, fertilizers and the like at the same time. In particular, by blending one or more other herbicides, the herbicidal spectrum can be broadened, and the effect of the present invention can be made more stable.

[0012]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the compounds, dosage amounts, dosage forms and the like in the present invention are not limited only to the examples. All “parts” mean parts by weight. [Compounding Example 1] Granules Compound (A) 5 parts Compound (B) 0.1 part Bentonite 55 parts Talc 39.9 parts After uniformly mixing and pulverizing the above, a small amount of water was added and kneaded with stirring and kneading. Granulate with an extrusion granulator and dry to give granules.

[Formulation Example 2] Granule wettable powder (dry flowable agent) Compound (A) 75 parts Compound (B) 1.5 parts Isoben No. 1 10 parts (anionic surfactant: Kuraray Isoprene Chemical Co., Ltd. trade name) Vanilex N 5 parts (anionic surfactant: Sanyo Kokusaku Pulp Co., Ltd. trade name) Carplex # 80 8.5 parts (white carbon : Shionogi Seiyaku Co., Ltd. product name) The above is uniformly mixed and pulverized to obtain a dry flowable agent.

[Formulation Example 3] Wettable powder Compound (A) 50 parts Compound (B) 1 part Dichlorite PFP 42 parts (Kaolin-based clay: product name of Siklite Industry Co., Ltd.) Solpol 5050 2 parts (anionic interface Activator: Toho Chemical Industry Co., Ltd. trade name Norx 1000C 3 parts (Anionic surfactant: Toho Chemical Industry Co., Ltd. trade name) Carplex # 80 (anti-caking agent) 2 parts (White Carbon: Shionogi Pharmaceutical Co., Ltd. trade name) The above is uniformly mixed and pulverized to obtain a wettable powder.

[Formulation Example 4] Granules Compound (A) 5 parts Compound (C) 0.2 parts Bentonite 55 parts Talc 39.8 parts After uniformly mixing and pulverizing the above, a small amount of water is added and mixed by stirring. Knead, granulate with an extrusion granulator, and dry to give granules.

[Formulation Example 5] Granules Compound (A) 5 parts Compound (D) 0.3 parts Bentonite 55 parts Talc 39.7 parts The above ingredients are uniformly mixed and pulverized, and then a small amount of water is added and mixed by stirring. Knead, granulate with an extrusion granulator, and dry to give granules.

[Compounding Example 6] Granules Compound (A) 5 parts Compound (E) 0.1 part Bentonite 55 parts Talc 39.9 parts After uniformly mixing and grinding the above, a small amount of water is added and mixed by stirring. Knead, granulate with an extrusion granulator, and dry to give granules.

[Compounding Example 7] Granules Compound (A) 5 parts Compound (F) 0.3 parts Bentonite 55 parts Talc 39.7 parts After uniformly mixing and grinding the above, a small amount of water is added and mixed by stirring. Knead, granulate with an extrusion granulator, and dry to give granules.

[Formulation Example 8] Granules Compound (A) 5 parts Compound (G) 0.2 parts Bentonite 55 parts Talc 39.8 parts The above ingredients are uniformly mixed and pulverized, and then a small amount of water is added and mixed by stirring. Knead, granulate with an extrusion granulator, and dry to give granules.

[Formulation Example 9] Granules Compound (A) 5 parts Compound (H) 0.1 part Bentonite 55 parts Talc 39.9 parts The above components are uniformly mixed and pulverized, and then a small amount of water is added and mixed by stirring. Knead, granulate with an extrusion granulator, and dry to give granules.

Regarding the synergistic herbicidal effect of the herbicide mixture,
It 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 stable combination of two herbicides can be calculated as follows. (Colby (C
olby S. R. ), Calculation of synergistic and antagonistic responses of herbicide combinations, Weed, vol. 15,
See pages 20 to 22 (1967). E = α + β- (α · β / 100) α: Inhibitory rate when herbicide A is treated with a dose of akg / ha β: Herbicide B with bkg / ha Inhibition rate when treated with different amounts E: Herbicide A is akg / ha, Herbicide B is bkg / ha
Inhibition rate expected when treated with the amount of i.e., that is, if the actual inhibition rate is larger than the above calculation, it can be said that the activity by the combination shows a synergistic effect.

Next, the usefulness of the composition of the present invention as a herbicide will be specifically described in the following test examples. [Test Example 1] Herbicidal effect test under flooded condition After alluvial soil was put into a 1/5000 ares Wagner pot, water was added and mixed to obtain a flooded condition with a water depth of 4 cm. After sowing seeds of eel and firefly and placing tubers of Urikawa and Cyperus japonicus, two rice seedlings at 2.5 leaf stage were applied.
Implanted at a depth of cm. On the day after rice transplantation, a suspension of the test reagent having a predetermined concentration was dropped using a wet pipette using a wettable powder prepared according to the above formulation. Three weeks after the chemical treatment, the above-ground fresh weight of each weed and rice was measured, and the inhibition rate (%) was calculated by the following formula.

Inhibition rate (%) = (1-above-ground fresh weight of treated area / above-ground fresh weight of untreated area) × 100 The results are shown in Tables 1 and 2. The symbols in the table represent the following. a: Konagi, b: Firefly, c: Urikawa, d: Spodoptera frugiperda, r: Rice [Test Example 2] Chemical damage test under shallow planting conditions of paddy rice After putting alluvial soil in a 1/5000 are Wagner pot, Water was added and mixed, and the water was submerged at a depth of 4 cm. Rice seedlings in the 2.5 leaf stage were transplanted at a depth of 0.5 cm. On the day of transplantation, a suspension of the test reagent having a predetermined concentration was added dropwise using a measuring pipette using a wettable powder prepared according to the above formulation. The body weight of the above-ground part was measured 3 weeks after the chemical treatment, and the inhibition rate (%) was determined in the same manner as in Test Example 1 above. The results are shown in Table 3.

[0024]

[Table 1] Table 1 Herbicidal effect of single agent (inhibition rate%) ─────────────────────────────── Throughput of seed compound ──────────────────── (g / ha) a b cd r ──────────────── ─────────────── (A) 500 75 23 62 4 40 (B) 2 80 78 65 85 0 (C) 4 72 74 68 80 0 (D) 4 76 60 60 70 86 0 (E) 2 71 75 62 77 0 (F) 4 73 75 75 78 83 0 (G) 2 86 62 76 72 0 (H) 4 84 70 70 60 60 0 ────────────── ─────────────────

[0025]

[Table 2] Table 2 Measured value and expected value (inhibition rate%) of the herbicidal effect of the admixture ──────────────────────────── ─────── ab cdr processing amount of each effective herbaceous compound component ───────────────────────── (g / ha) (F) (E) (F) (E) (F) (E) (F) (E) (F) (E) ───────────────────── ────────────── (A) + (B) 500 + 2 100 95 100 78 100 87 100 77 0 (A) + (C) 500 + 4 100 93 100 80 100 88 100 81 0 0 (A) + (D) 500 + 4 100 94 97 69 100 89 100 87 0 0 (A) + (E) 500 + 2 100 93 100 81 100 86 99 78 0 0 (A) + (F ) 500 + 4 100 93 100 81 100 92 100 84 0 0 (A) + (G) 500 + 2 100 97 100 71 100 91 100 74 0 0 (A) + (H) 500 + 4 100 96 100 77 100 89 98 69 0 0 ────────────────────────────────── (However, (E) in the table is for Colby Suppression calculated from the formula (F) shows the actual measured value, and the numerical values on the left and right sides of the column of the amount of each active ingredient treated represent the corresponding doses of the compound in the column of compound name. (The description in the column for the amount of active ingredient treated in Table 3 shall apply accordingly.)

[0026]

[Table 3]

[0027]

INDUSTRIAL APPLICABILITY The composition of the present invention exerts an excellent synergistic effect, and at the same time, compound (A) is compound (B), compound (C), compound (D), compound (E), compound (F), compound (G). ) And the compound (H), the phytotoxic effect on transplanted rice under shallow planting conditions is also reduced.

Claims (2)

[Claims] 1. A compound represented by the following formula (A) and a compound represented by the following formulas (B), (C), (D), (E), (F), (G) and (H). A herbicidal composition comprising at least one compound selected from the compounds as an active ingredient. Embedded image 2. A compound represented by formula (A) according to claim 1 and formulas (B), (C), (D), (E), (F),
A herbicidal method comprising simultaneously using at least one compound selected from the compounds represented by (G) and (H).