JPH09255508A - Herbicidal composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a herbicidal composition capable of synergistically providing herbicidal effects and completely controlling barnyard grass with low doses by including two specific kinds of compounds as active ingredients. SOLUTION: This herbicidal composition comprises compounds of formulas I and II as active ingredients. the compound of formula II is contained in an amount of 0.001-100 pts.wt. based on 1 pt.wt. compound of formula I in order to manifest favorable effects. The doses of the chemicals for treatment are 10g to 10kg/ha compound of formula I and 1g to 10kg/ha compound of formula II. Furthermore, the compounds of formulas I and II are usually mixed with a herbicide, e.g. pyrazosulfuron-ethyl for use.

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. A compound represented by the following formula (A) (generic name: ACN, quinoclamin, hereinafter referred to as compound (A)) has already been put into practical use as a herbicide for paddy rice effective for controlling algae, duckweed and the like. In addition, a compound represented by the following formula (B) (generic name: cyhalofop-butyl, hereinafter referred to as compound (B)) is a compound under development as a herbicide for paddy rice, and is highly specific to Nobie. Has a controlling effect. However, while the compound has a high effect of treating the growing season with the growing season, it has a low effect of pre-emergence treatment. In addition, it has no effect on other weeds in paddy fields.

[0003]

Embedded image

[0004]

Means for Solving the Problems The present inventors have conducted extensive studies in view of the above problems, and as a result, contain a compound represented by the above formula (A) and a formula (B) as active ingredients. It has been found that the herbicide composition (hereinafter referred to as the composition of the present invention) having the above-mentioned composition exhibits an excellent synergistic effect.

In the composition of the present invention, by adding the compound (A) to the compound (B), not only the herbicidal effect can be obtained additively but also a synergistic effect can be obtained. It can be completely controlled.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The composition of the present invention exerts a preferable effect in that the compound (B) is added in an amount of 0.
001 to 100 parts by weight, the compound (A)
When 0.01 to 10 parts by weight of the compound (B) is included per 1 part by weight, more preferable effects can be expected.

The suitable treatment dose of the composition of the present invention depends on the kind of target weeds to be controlled, but the compound (A) is 10 g to 10 kg / ha and the compound (B) is 1 g to 1 g as the active ingredient. Compound (A) for 10 kg
1 kg to 3 kg / ha, compound (B) 0.01 kg
In the case of ~ 3 kg / ha, a more preferable effect can be expected.

The compositions according to the invention are preferably used in the form of compositions in which the active ingredient is mixed with a carrier which comprises a solid or liquid diluent. The composition preferably further comprises a surfactant. If necessary, the compound of the present invention may be mixed with other herbicides, various insecticides, fungicides, plant growth regulators, synergists and the like at the time of formulation or spraying.

[0009] In particular, by applying it in combination with other herbicides, it is expected that the cost can be reduced by reducing the amount of the applied drug, the herbicidal spectrum can be expanded by the synergistic action of the mixed drugs, and a higher herbicidal effect can be expected. At this time, a combination with a plurality of known herbicides is also possible at the same time. The types of herbicides used in combination with the compound of the present invention include, for example, the compounds described in Farm Chemicals Handbook, 1993 edition.

Examples of preferred agents to be used in combination with the compound of the present invention include pyrazosulfuron-ethyl (pyra).
zosulfuron ethyl / general name), bensulfuron methyl (bensulfuron methyl / generic name), sinosulfuron (ci
nosulfuron / generic name), imazosulfu
ron / generic name), DPX-A8947 (N-(((4,6-dimetho
xypyrimidin-2-yl) amino-carbonyl))-1-methyl-4- (2-me
thyl-2H-tetrazol-5-yl) -1H-pyrazole-5-sulfonamid
e), pretilachlor (generic name), esprocarb (generic name), pyrazolate (pyr)
azolate / generic name, pyrazoxifene /
(Generic name), benzophenap (generic name),
Dymron (generic name), bromobutide (bromob
utide / generic name), naproanilide / generic name, clomeprop / generic name, CN
P (generic name), clomethoxynil (generic name), bifenox (generic name), oxadiazon (generic name), mefenacet (mef)
enacet / generic name), butachlor / generic name, butenachlor / generic name, dithiopyr / generic name, benfrusate
resate / generic name, pyributicarb / generic name, benchiocarb / benthiocarb / generic name, dimepiperate / generic name, molinate / molinate / generic name, butamifos / butamifos / generic name, quinclorac / Generic name), cinmethylin (generic name), simetryn (simetry)
n / generic name), SAP (bensulide / generic name), dimethametryn (dimethametryn / generic name), MCPA, MCP
B, 2 ′, 3′-dichloro-4-ethoxymethoxybenzalinide (test name is HW-52), 1- (2-chlorobenzyl) -3- (α, α-dimethylbenzyl) urea (test name is JC-940), N- [2 '-(3'-methoxy) -thienylmethyl] -N-chloroacetyl-2,
6-dimethylanilide (test name is NSK-850) and the like.

In applying the present composition as a herbicide, generally, a suitable carrier, for example, a solid carrier such as clay, talc, bentonite, diatomaceous earth or the like, water, alcohols (methanol, ethanol, etc.), aromatic hydrocarbons ( Benzene, toluene, xylene, etc.), chlorinated hydrocarbons,
Ethers, ketones, esters (ethyl acetate etc.),
It can be applied by mixing it with a liquid carrier such as acid amides (dimethylformamide, etc.), and if desired, an emulsifier, a wetting agent, a dispersant, a binder, a penetrant, a spreading agent, a stabilizer, etc. are added to the emulsion. It can be put into practical use in any dosage form such as a liquid, a wettable powder, a powder, a granule, a wettable granule, a flowable tablet and a tablet.

At this time, a plurality of other herbicides, insecticides,
It is also possible to use it as a mixture with a fungicide, a plant growth regulator, a fertilizer 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.

[0013]

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) 1 part Bentonite 55 parts Talc 39 parts After uniformly mixing and pulverizing the above, a small amount of water was added and the mixture was kneaded with stirring to form an extrusion type product. Granulate with a granulator and dry to give granules.

[Formulation Example 2] Granule wettable powder (dry flowable agent) Compound (A) 50 parts Compound (B) 20 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 15 parts (white carbon: Shiono Gyosei Co., Ltd. trade 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) 2 parts Dichlorite PFP 41 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.

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 before novier germination After alluvial soil was placed in a Wagner pot of 1/5000 are, water was added to mix, and the water was submerged under a depth of 4 cm. The seeds of Novier were sown, and rice seedlings having a leaf age of 2.5 leaves were transplanted at a depth of 2 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. In the following, the symbols in the table represent the following. a: Novier, r: Rice [Test Example 2] Herbicidal effect test in Nobie 2.5 leaf stage After alluvial soil was put in a 1/5000 are Wagner pot, water was added to mix it, and a water depth of 4 cm was applied. It was a condition. The seeds of Novier were sown, and at the time of growth at the 2.5 leaf stage, a wettable powder prepared in accordance with the above formulation was used to drop a suspension of the reagent at a predetermined concentration with a measuring pipette. 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 Tables 3 and 4. The symbols in the table are the same as in Test Example 1.

[0019]

[Table 1] Table 1 Herbicidal effect of single agent (inhibition rate%) ────────────────────────────── Throughput of seed compound ──────────────────── (g / ha) ar ─────────────────── ──────────── (A) 500 100 ────────────────────────────── (B ) 50 70 0 100 80 0 150 90 90 ───────────────────────────────

[0020]

[Table 2] Table 2 Measured value and expected value (inhibition rate%) of the herbicidal effect of the admixture ──────────────────────────── ─────── ar processing amount of each effective herbaceous compound component ──────────────────────── (g / ha) (F) (E) (F) (E) ────────────────────────────────── (A) + (B) 500 + 50 100 73 0 0 (A) + (B) 500 + 100 100 82 0 0 (A) + (B) 500 + 150 100 91 0 0 ─────────────── ─────────────────── (However, in the table, (E) shows the expected value of the suppression rate obtained from the Colby equation, and (F) shows the measured value. The numbers on the left side and the numbers on the right side of the column of the amount of each active ingredient treated represent the corresponding doses of the compounds in the column of the compound name, respectively.
The description in the table follows this. )

[0021]

[Table 3]

[0022]

[Table 4] Table 4 Measured and expected values (inhibition rate%) of the herbicidal effect of the mixture ──────────────────────────── Ar processing amount of each effective herbaceous compound component ────────────────── (g / ha) (F) (E) (F) (E) ───── ────────────────────── (A) + (B) 500 + 50 100 82 0 0 (A) + (B) 500 + 100 100 91 0 0 (A) + (B) 500 + 150 100 100 0 0 ───────────────────────────

[0023]

The composition of the present invention exerts an excellent synergistic effect on Nobie.

Claims (3)

[Claims] 1. A composition comprising a compound represented by the following formula (A) and a compound represented by the following formula (B). Embedded image 2. A herbicidal composition comprising a compound represented by formula (A) according to claim 1 and a compound represented by formula (B) as active ingredients. 3. A herbicidal method comprising using the compound represented by the formula (A) according to claim 1 and the compound represented by the formula (B) at the same time.