JPH11199412A - Herbicide - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new herbicide for paddy rice. SOLUTION: This new herbicide contains, as active ingredients, at least one compound selected from pyrazosulfuron-ethyl, halosulfuron-methyl, imazosulfuron, azimsulfuron, cyclosulfamuron, ethoxysulfuron, cinosulfuron, and bensulfuron-methyl, and carfentrazone-ethyl.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a herbicide 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. Carfentrazone ethyl (generic name, hereinafter referred to as Compound A. The test name was F-
8426. ) Is a compound under development as a wheat herbicide. As a herbicide for paddy rice, it has a high control effect on corn and annual broadleaf weeds, but has a low effect on perennial weeds. Further, pyrazosulfuron-ethyl (general name, hereinafter referred to as compound B. The test name was NC-31.
One. ), Halosulfuron-methyl (generic name, hereinafter compound C)
Called. The test name was NC-319. ), Imazosulfuron (generic name, hereinafter referred to as Compound D. The test name was TH
-913. ), Azimsulfuron (general name, hereinafter referred to as compound E. Test name is DPX-47.), Cyclosulfamuron (general name, hereinafter referred to as compound F. Test name is AC-140.), Ethoxys Ruflon (common name,
Hereinafter, it is referred to as Compound G. The test name was Hoe-40
4. ), Sinosulfuron (general name, hereinafter referred to as Compound H. Test name is CG-148.) And bensulfuronmethyl (generic name, hereinafter referred to as Compound I. Test name is D
PX-84. ) Is a compound that has already been put into practical use or is under development as a rice herbicide, and all of them show an effect on a large number of weeds at an extremely low dose, but some of the weeds are less effective. is there.

[0003] In addition, these compounds have high safety against transplanted rice under ordinary planting conditions.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the above problems, and as a result, selected from compound B, compound C, compound D, compound E, compound F, compound G, compound H and compound I. It has now been found that a herbicide characterized by containing at least one compound as well as compound A as an active ingredient (hereinafter referred to as the herbicide of the present invention) exhibits excellent synergistic action.

[0005] In the herbicide of the present invention, compound B, compound C,
By adding compound A to at least one compound selected from compound D, compound E, compound F, compound G, compound H and compound I, the herbicidal effect is not only obtained additively but also synergistically. Effect can be obtained and many weeds can be completely controlled at a low dose. The utility of the herbicide of the present invention in practical use is extremely high.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The herbicide of the present invention exhibits a suitable effect because compound B, compound C, compound D, compound E, compound F, compound G, compound H and compound H per 1 part by weight of compound A. 0.1 to 100 parts by weight of at least one compound selected from I.
When the content is from 0.01 to 10 parts by weight, more preferable effects can be expected.

The preferred amount of the herbicide to be treated according to the present invention depends on the kind of the target weeds to be controlled, etc., but the compound A as an active ingredient is 1 g to 10 kg / ha and the compound B,
Compound C, Compound D, Compound E, Compound F, Compound G,
Desirably, at least one compound selected from compound H and compound I is 0.1 g to 1 kg, compound A is 10 g to 3 kg / ha, compound B, compound C, compound D, compound E, compound More favorable effects can be expected when at least one compound selected from F, compound G, compound H and compound I is 1 g to 300 g / ha.

When the herbicide of the present invention is applied, it is usually mixed with a suitable solid carrier or liquid carrier, and if necessary, a surfactant, a penetrant, a spreading agent, a thickener, a deicing agent,
A binder, an anti-caking agent, a disintegrating agent, an anti-decomposition agent, etc. are added, and the solution, emulsion, wettable powder, aqueous solvent, wettable powder for granules, aqueous solvent for granules, suspension, emulsion, suspo It can be put to practical use in preparations of any dosage form such as emulsions, microemulsions, powders, granules and gels.

At this time, a plurality of other herbicides, insecticides,
It can be used in combination with fungicides, plant growth regulators, fertilizers and the like. 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. Also,
From the viewpoint of labor saving and improvement in safety, the above-mentioned preparation of any dosage form can be provided by being enclosed in a water-soluble package.

Examples of the solid carrier include natural minerals such as quartz, kaolinite, pyrophyllite, sericite, talc, bentonite, acid clay, attapulgite, zeolite and diatomaceous earth, calcium carbonate, ammonium sulfate, sodium sulfate and potassium chloride. And the like, synthetic silicic acid and synthetic silicate. As liquid carriers, for example, alcohols such as ethylene glycol, propylene glycol and isopropanol,
Aromatic hydrocarbons such as xylene, alkylbenzene and alkylnaphthalene; ethers such as butyl cellosolve; ketones such as cyclohexanone; esters such as γ-butyrolactone; acid amides such as N-methylpyrrolidone and N-octylpyrrolidone; Vegetable oils such as soybean oil, rapeseed oil, cottonseed oil and castor oil and water.

These solid and liquid carriers may be used alone or in combination of two or more. As a surfactant,
Nonionic properties such as polyoxyethylene alkyl ether, polyoxyethylene alkyl aryl ether, polyoxyethylene styryl phenyl ether, polyoxyethylene polyoxypropylene block copolymer, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, and polyoxyethylene sorbitan fatty acid ester Surfactant, alkyl sulfate, alkyl benzene sulfonate, lignin sulfonate, alkyl sulfosuccinate, naphthalene sulfonate, alkyl naphthalene sulfonate, salt of naphthalene sulfonic acid formalin condensate, alkyl naphthalene sulfonic acid formalin Salts of condensates, polyoxyethylene alkylaryl ether sulfates and phosphates, polyoxyethylene styryl phenylate Anionic surfactants such as sulfuric acid and phosphates, polycarboxylates and polystyrene sulfonates, cationic surfactants such as alkylamine salts and alkylquaternary ammonium salts, and amphoteric surfactants such as amino acid type and betaine type Is mentioned.

The content of these surfactants is not particularly limited, but is preferably in the range of usually 0.05 to 20 parts by weight based on 100 parts by weight of the preparation of the present invention. These surfactants may be used alone or in combination of two or more. Next, formulation examples of the preparation will be described. However, the composition examples of the present invention are not limited to these. In the following formulation examples, "parts" means parts by weight.

[Wettable powder] Active ingredient 0.1 to 80 parts Solid carrier 5 to 98.9 parts Surfactant 1 to 10 parts Others 0 to 5 parts Others include, for example, an anti-caking agent and an anti-decomposition agent.

[Emulsion] 0.1 to 30 parts of active ingredient 55 to 95 parts of liquid carrier Surfactant 4.9 to 15 parts Others 0 to 10 parts Others include, for example, spreading agents and decomposition inhibitors.

[Suspension] Active ingredient 0.1 to 70 parts Liquid carrier 15 to 98.89 parts Surfactant 1 to 12 parts Others 0.01 to 30 parts Others include, for example, an antifreezing agent and a thickener.

[Water dispersible granule] 0.1 to 90 parts of active ingredient 0 to 98.9 parts of solid carrier 1 to 20 parts of surfactant Other 0 to 10 parts Others include, for example, a binder and a decomposition inhibitor.

[Granules] Active ingredient 0.01 to 10 parts Solid carrier 90 to 99.99 parts Others 0 to 10 parts Others include, for example, a binder and a decomposition inhibitor.

[0018]

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.

[Formulation Example 1] Granules Compound A 3 parts Compound B 0.1 parts Bentonite 55 parts Talc 41.9 parts After uniformly mixing and pulverizing the above, a small amount of water was added, followed by stirring, mixing and kneading. Granulate with an extrusion granulator and dry to granules.

[Formulation Example 2] Water dispersible granule (dry flowable) 50 parts of compound A 30 parts of compound B 5 parts of Hytenol NE-15 5 parts (anionic surfactant: trade name of Daiichi Kogyo Seiyaku Co., Ltd.) N 10 parts (anionic surfactant: trade name of Nippon Paper Industries Co., Ltd.) Carplex # 80D 5 parts (synthetic hydrous silicic acid: Shionogi & Co., Ltd. trade name) And kneading with stirring, kneading, granulating with an extrusion granulator, and drying to obtain a wettable powder.

Formulation Example 3 Wettable powder 25 parts of compound A 25 parts of compound B 2 parts of solpol 5039 2 parts (mixture of nonionic surfactant and anionic surfactant: trade name of Toho Chemical Industry Co., Ltd.) Plex # 80D 2 parts (Synthetic hydrous silicic acid: Shionogi & Co., Ltd. trade name) Pyrophyllite 46 parts The above are uniformly mixed and pulverized to obtain a wettable powder.

[Formulation Example 4] Granules 1 part of compound A 0.5 part of compound C 55 parts of bentonite 43.5 parts of talc After uniformly mixing and pulverizing the above, a small amount of water was added, followed by stirring, mixing and kneading. Granulate with an extrusion granulator and dry to granules.

[Formulation Example 5] Granules Compound A 3 parts Compound D 0.9 parts Bentonite 55 parts Talc 41.1 parts After uniformly mixing and pulverizing the above, a small amount of water was added, followed by stirring, mixing and kneading. Granulate with an extrusion granulator and dry to granules.

[Formulation Example 6] Granule 1 part of compound A 0.1 part of compound E 55 parts of bentonite 43.9 parts of talc 43.9 parts After uniformly mixing and pulverizing the above, a small amount of water was added, followed by stirring, mixing and kneading. Granulate with an extrusion granulator and dry to granules.

[Formulation Example 7] Granules Compound A 2 parts Compound F 0.5 parts Bentonite 55 parts Talc 42.5 parts After uniformly mixing and pulverizing the above, a small amount of water was added, followed by stirring, mixing and kneading. Granulate with an extrusion granulator and dry to granules.

[Formulation Example 8] Granules Compound A 0.8 parts Compound G 0.8 parts Bentonite 55 parts Talc 43.4 parts After uniformly mixing and pulverizing the above, a small amount of water was added, followed by stirring, mixing and kneading. Then, the mixture is granulated by an extrusion granulator and dried to form granules.

[Formulation Example 9] Granules Compound A 1.5 parts Compound H 1 part Bentonite 55 parts Talc 42.5 parts

[Formulation Example 10] Granules 1 part of compound A 1 part of compound I 55 parts of bentonite 43 parts of talc After uniformly mixing and pulverizing the above, a small amount of water was added, followed by stirring, mixing and kneading, followed by extrusion granulation. Granulate in a machine and dry to granules.

With respect to the synergistic herbicidal effect of the herbicide mixture,
It can be explained as follows. That is, the individual active compounds often show disadvantages in their herbicidal activities, respectively, in which case the herbicidal activity of the combination of the two active compounds is simply the sum of the activities of each of the two compounds ( This is referred to as synergism when it is greater than the expected activity). The expected activity of a stable combination of two herbicides can be calculated as follows. (Colby (C
olby S. et al. R. ), Calculation of Synergistic and Antagonistic Responses of Herbicide Combinations, Weed, Volume 15,
(See pages 20-22 (1967))

E = α + β− (α · β / 100)

Α: Inhibition rate when herbicide A is treated at an amount of akg / ha β: Inhibition rate when herbicide B is treated at an amount of bkg / ha E: Herbicide A is akg / ha, herbicide Agent B at bkg / ha
Expected suppression rate when processed with

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 herbicide 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 placing alluvial soil in a 1/5000 arel Wagner pot, water was added and mixed to obtain a flooded condition at a depth of 4 cm. After sowing seeds of corns and fireflies, placing the tubers of Urikawa and Spodoptera crispens, two 2.5-leaf rice plants
Implanted at a depth of cm. On the day following the rice transplantation, a suspension having a predetermined concentration of the test agent was dropped using a wet pipette using a wettable powder prepared in accordance with Formulation Example 3. Three weeks after the chemical treatment, the above-ground live weight of each weed and rice was measured, and the inhibition rate (%) was determined by the following equation.

Suppression rate (%) = (1−aboveground live weight in treated section / aboveground fresh weight in untreated section) × 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: Mizugaya, r: Rice

[0035]

Table 1 Table 1 Herbicidal effect of single agent (% inhibition) 抑制 Active ingredient Seed compound throughput ──────────────────── (g / ha) abcdr 処理Ａ A5 575 23 62 150 B2 80 78 65 850 C4 724 74 680 000 D 476 60 70 860 E27 175 75 62 770 F 473 75 78 830 G 286 62 76 270 H 484 70 70 6000 I 480 70 70 550 ────────────────────── ────────

[0036]

Table 2 Actual and expected values of the herbicidal effect of the mixture (suppression rate%)有効 Each effective grass species component───────────────────────── Compound treatment amount abcdr (g / ha ) ───────────────────────── (F) (E) (F) (E) (F) (E) (F) (E) (F) (E) ────────────────────────────────── A + B 5 + 2 100 95 100 85 100 87 100 87 0 0 A + C 5 + 4 100 93 100 80 100 88 100 83 0 0 A + D 5 + 4 100 94 97 69 100 89 100 88 0 0 A + E 5 + 2 100 93 100 81 100 86 99 80 0 0 A + F 5 + 4 100 93 100 81 100 92 100 86 0 0 A + G 5 + 2 100 97 100 71 100 91 100 76 0 0 A + H 5 + 4 100 96 100 77 100 89 98 66 0 0 A + I 5 + 4 100 95 100 77 100 77 90 62 0 0 ────────────────────────────── ───

(However, in the table, (E) indicates the expected value of the suppression rate obtained from Colby's formula, (F) indicates the actually measured value, and the left side of the column for the throughput of each active ingredient. The numerical value and the numerical value on the right side respectively represent the corresponding dose of the compound in the column of the compound name.)

[0038]

EFFECT OF THE INVENTION The herbicide of the present invention has an excellent synergistic effect, and has no effect on paddy rice.

Claims (2)

[Claims] 1. A compound selected from pyrazosulfuron-ethyl, halosulfuron-methyl, imazosulfuron, azimsulfuron, cyclosulfamuron, ethoxysulfuron, sinosulfuron and bensulfuron-methyl, and carfentrazone-ethyl A herbicide comprising as an active ingredient. 2. A herbicidal method using the herbicide according to claim 1.