JPH0669927B2 - Herbicide composition - Google Patents

Description

Detailed Description of the Invention

[0001]

This invention relates to herbicidal compositions which, by mixing two herbicides, show not only the additive but also synergistic effect of their respective herbicides.

[0002]

2. Description of the Related Art A wide variety of agents have been put to practical use in the course of 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 having superior herbicidal properties.

[0003]

The pyrazole sulfonylurea derivative represented by the general formula (I) has a very low dose and an excellent herbicidal effect as compared with conventional herbicides. As a result of research to increase the herbicidal effect of the compound represented by the general formula (I), 2-chloro-4,6 which has been conventionally used for the compound represented by the general formula (I) is obtained.
-Bis (ethylamino) -s-triazine (hereinafter referred to as simazine), 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (hereinafter referred to as atrazine) 2-methylthio-4-ethylamino-6 -Isopropylamino-s-triazine (hereinafter referred to as ametrine) or 2-chloro-4,6-bis (isopropylamino) -s-triazine (hereinafter referred to as propazine)
The present invention has been completed by discovering that, when one of the above compounds is blended, not only the respective herbicidal effects are obtained additively, but also a synergistic herbicidal effect appears. This synergistic effect is great, and the composition of the present invention can completely control annual weeds to perennial weeds with a low dose, and the present invention is very useful. In addition, the above-mentioned mixed application makes it possible to reduce the amount of the herbicide used in the composition of the present invention, which has been conventionally used, and is extremely useful.

Further, the herbicidal composition of the present invention has an effect even if it is treated before and after germination of weeds, and a high effect can be obtained by soil treatment and foliage / soil treatment. It can be applied to the control of various weeds in agricultural and horticultural fields such as upland fields and orchards, and playgrounds, vacant lots, forests, tank yards, and track ends, and shows a great economic effect in controlling weeds. The composition according to the present invention, depending on the relative activity of each component, generally contains 0.001 to 50 parts by weight of a compound represented by the general formula (I) per part by weight of simazine, atrazine, amethrin or propazine, preferably Contains 0.001 to 10 parts by weight. In many cases, the greatest advantage of the combined herbicides according to the invention is that the proportion of the compounds of the formula (I) is relatively lower than the other herbicides, for example the general formula (part by weight per part by weight of the other herbicides). Obtained when the compound represented by I) is 0.001 to 0.5 part by weight.

The amount of mixture to be applied depends on a number of factors, such as the type of the particular target plant whose growth is to be arrested, but generally amounts of 0.001 to 10 Kg / ha are generally suitable. A person skilled in the art can easily determine an appropriate usage rate by a standardized ordinary test without performing a large number of experiments. 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.

Next, Table 1 shows typical examples of the compounds represented by formula (I) in the present invention. The following compounds are included in the compound represented by the general formula (I), but the compound represented by the general formula (I) is not limited thereto. Table 1

[0007]

[Chemical 2]

[0008]

[Table 1]

Me: Methyl group Et: Ethyl group Individual active compounds often show their respective herbicidal activities, but in that case, the herbicidal activity obtained by combining two active compounds is two of those. This is said to be synergistic when it is greater than the simple sum of the activities of each of the compounds (expected activity). The expected activity of a particular combination of two herbicides can be calculated as follows. (Calculation of synergistic and antagonistic reactions of Colby SR herbicide combinations, see “Weed”, Vol. 15, pages 20-22, 1967) E = α + β−α · β / 100 α: herbicide A in aKg / ha Inhibition rate when treated with β: Inhibition rate when herbicide B was treated with bKg / ha E: Expected when herbicide A was treated with aKg / ha and herbicide B with bKg / ha Suppression rate

That is, it can be said that the combined activity exhibits a synergistic effect if the actual inhibition rate is larger than the above calculation. Hereinafter, the present invention will be described in more detail with reference to Examples, but the compounds, dosage amounts, dosage forms and the like in the present invention are not limited to the Examples. All "parts" mean parts by weight.

[0011]

【Example】

 (Formulation Example 1) Wettable powder Compound No. 3 ─────── 5 parts Atrazine ─────── 50 parts Dikrite A ──────── 41 parts (Kaolin clay: Sigrite) Industrial Co., Ltd. trade name) Solpol 5039 ───── 2 parts (mixture of nonionic surfactant and anionic surfactant: Toho Chemical Co., Ltd. trade name) Carplex (anti-caking agent) ─-2 Part (White carbon: trade name of Shionogi Pharmaceutical Co., Ltd.) The above is uniformly mixed and pulverized to obtain a wettable powder.

(Formulation Example 2) Wettable powder Compound No. 1 ──────── 2 parts Atrazine ──────── 70 parts Dikrite A ──────── 24 parts (Kaolin clay : Sigrite Industrial Co., Ltd. trade name Solpol 5039 ────── 2 parts (mixture of nonionic and anionic surfactants: Toho Chemical Co., Ltd. trade name) Carplex Agent) -2 parts (White carbon: trade name of Shionogi Pharmaceutical Co., Ltd.) The above is uniformly mixed and pulverized to obtain a wettable powder.

(Formulation Example 3) Wettable powder Compound No. 6 ──────── 1 part Atrazine ─────── 60 parts DIKELITE A ──────── 35 parts (Kaolin type) Clay: Siglite Industrial Co., Ltd. product name) Solpol 5039 ────── 2 parts (mixture of nonionic surfactant and anionic surfactant: Toho Chemical Co., Ltd. product name) Carplex Inhibitor) -2 parts (White carbon: trade name of Shionogi Pharmaceutical Co., Ltd.) The above is uniformly mixed and pulverized to obtain a wettable powder.

(Formulation Example 4) Wetting agent Compound No. 2 ──────── 0.5 part Ametrine ─────── 25 parts Dikrite A ──────── 70.5 parts (Kaolin clay : Sigrite Industrial Co., Ltd. trade name Solpol 5039 ────── 2 parts (mixture of nonionic surfactant and anionic surfactant: Toho Chemical Co., Ltd. trade name) Carplex Agent) -2 parts (White carbon: trade name of Shionogi Pharmaceutical Co., Ltd.) The above is uniformly mixed and pulverized to obtain a wettable powder.

(Formulation Example 5) Wettable powder Compound No. 4 ─────── 0.1 parts Ametrine ──────── 50 parts Dikrite A ──────── 45.9 parts (Kaolin clay : Sigrite Industrial Co., Ltd. trade name Solpol 5039 ────── 2 parts (mixture of nonionic and anionic surfactants: Toho Chemical Co., Ltd. trade name) Carplex Agent) -2 parts (White carbon: trade name of Shionogi Pharmaceutical Co., Ltd.) The above is uniformly mixed and pulverized to obtain a wettable powder.

(Formulation Example 6) Wettable powder Compound No. 3 ─────── 5 parts Propazine ──────── 50 parts Dikrite A ──────── 41 parts (Kaolin clay : Sigrite Industrial Co., Ltd. trade name Solpol 5039 ────── 2 parts (mixture of nonionic surfactant and anionic surfactant: Toho Chemical Co., Ltd. trade name) Carplex Agent) -2 parts (White carbon: trade name of Shionogi Pharmaceutical Co., Ltd.) The above is uniformly mixed and pulverized to obtain a wettable powder.

(Formulation Example 7) Granules Compound No. 1 ──── 0.3 parts Simazine ──── 2 parts Bentonite ──── 57.7 parts Talc ──── 40 parts After uniformly mixing and grinding the above, Add a small amount of water, knead with stirring and kneading, granulate with an extrusion-type granulator, and dry to give granules.

(Formulation Example 8) Granules Compound No. 3 ──── 0.5 parts Simazine ──── 1 part Bentonite ──── 58.5 parts Talc ──── 40 parts After uniformly mixing and grinding the above, Add a small amount of water, knead with stirring and kneading, granulate with an extrusion-type granulator, and dry to give granules.

(Formulation Example 9) Granules Compound No. 8 ──── 0.1 parts Simazine ──── 2 parts Bentonite ──── 57.9 parts Talc ──── 40 parts After uniformly mixing and grinding the above, Add a small amount of water, knead with stirring and kneading, granulate with an extrusion-type granulator, and dry to give granules.

(Formulation Example 10) Flowable Compound No. 3 ──── 5 parts Atrazine ──── 40 parts Agrisol S-710 ──── 10 parts (Nonionic surfactant: trade name) Lunox 1000C ─ ─── 0.5 parts (anionic surfactant: trade name) 1% Rhodopol water ──── 20 parts (thickener: trade name) water ────────── 24.5 parts Mix and grind to make a flowable agent.

(Formulation Example 11) Flowable Compound No. 8 ──── 10 parts Atrazine ──── 25 parts Agrisol S-710 ──── 10 parts (Nonionic surfactant: trade name) Lunox 1000C ─ ─── 0.5 parts (anionic surfactant: trade name) 1% Rhodopol water ──── 20 parts (thickener: trade name) water ─────────── 34.5 parts Mix and grind to make a flowable agent.

Next, the herbicidal effect test of a single agent and a mixed agent for each herbicide is described below, and the mixing effect of the two agents of the present invention is shown. (Test example) Herbicidal effect test by foliage and soil treatment 15 cm in length, 22 cm in width, 6 cm in depth, put sterilized diluvial soil in a plastic box, cut into 10 cm each of rhizomes of chigaya and mugwort collected from the field. Five trees each were planted and covered with about 1.5 cm of soil. Thirty days after planting, the foliage and the soil surface were evenly spread so that the amount of the active ingredient was a predetermined ratio. The chemical solution for spraying was prepared by diluting a wettable powder or flowable agent prepared in the above-mentioned formulation example or in accordance with it with water and spraying it over the entire surface of foliage and soil surface of various weeds with a small spray. Four weeks after spraying the liquid, the weight of the above-ground surviving weeds was weighed, and the ratio of the untreated plot to the weight of the surviving weeds was expressed as a percentage, which was investigated according to the following criteria. The results are shown in Tables 2 and 3. Herbicide rate = (1-above-ground vegetation weight of treated area / above-ground vegetation weight of untreated area) x 100

[0023]

[Table 2] Table 2 ───────────────────────────────────── Active ingredient Compound throughput g / a Chigaya mugwort ──── ─────────────────────── 0.3 3 2 No. 1 0.1 1 1 1 ────────────────── ───────── 0.3 3 2 No. 2 0.1 1 1 1 ─────────────────────────── 0.3 43 No. 3 3 0.1 2 1 ─────────────────────────── 0.3 4 2 No. 4 0.1 10 10 ────────── ───────────────── 0.3 3 2 No. 5 0.1 1 1 ──────────────────────── ─── 0.3 3 2 No. 6 0.1 1 1 ─────────────────────────── 0.3 4 2 No. 7 0.1 10 ── ──────── ────────────────

[0024]

[Table 3] Table 2 (continued) ─────────────────────────── Active ingredient Compound throughput g / a Chigaya mugwort ─ ────────────────────────── 0.3 4 2 No. 8 0.1 10 0 ──────────────── ──────────── 5 1 2 Simazine 2.5 0 1 ─────────────────────────── 2.5 2 4 Atrazine 1.25 1 2 ─────────────────────────── 2.5 2 3 Ametrine 1.25 1 1 ────────────── ────────────── 5 2 3 Propazine 2.5 1 1 1 ───────────────────────────

[0025]

[Table 4] Table 3 (continued) ────────────────────────────────── Chigaya mugwort Treatment amount g / a Drug ────────────────────────── Existing general formula Measured value Calculated value Measured value + I drug compound ─────── ──────────────────────────── No. 35 +0.3 8 4.6 4.6 8 4.4 + +0.1 4 2.8 5 2.8 Simazine 2.5 +0 .3 7 4.0 7 3.7 ＋0.1 4 2.0 4 1.9 ─────────────────────────────────── No. 5 5 +0.3 7 3.7 7 7 3.6 + +0.1 4 1.9 6 2.8 Simazine 2.5 +0.3 6 3.0 5 5 2.8 +0.1 4 1.0 4 1.9 ────────────────── ──────────────── No. 7 5 ＋0.3 8 4.6 7.6 3.6 ＋＋ 0.1 4 1.9 4 2.0 Simazine 2.5 ＋0.3 7 4. 0 5 2.8 ＋0.1 3 1.0 4 1.0 ───────────────────────────────────

[0026]

[Table 5] Table 3 (continued) ────────────────────────────────── Chigaya mugwort Treatment amount g / a Drug ────────────────────────── Existing general formula Measured value Calculated value Measured value + I drug compound ─────── ──────────────────────────── No. 8 5 ＋0.3 8 4.6 7.6 3.6 ＋＋ 0.1 5 1.9 4 2.0 Simazine 2.5 ＋0 .3 7 4.0 5 2.8 +0.1 3 1.0 4 1.0 ─────────────────────────────────── No. 1 2.5 ＋0.3 7 4.4 8 5.2 ＋＋ 0.1 5 2.8 7 4.6 Atrazine 1.25 ＋0.3 7 3.7 7 3.6 3.6 +0.1 4 1.9 5 2.8 ────────────────── ──────────────── No. 2 2.5 ＋0.3 7 4.4 8 5.2 ＋＋ 0.1 5 2.8 7 4.6 Atrazine 1.25 ＋0. 3 7 3.7 7 3.6 +0.1 4 1.9 5 2.8 ───────────────────────────────────

[0027]

[Table 6] Table 3 (continued) ────────────────────────────────── Chigaya mugwort Treatment amount g / a Drug ────────────────────────── Existing general formula Measured value Calculated value Measured value + I drug compound ─────── ──────────────────────────── No. 3 2.5 ＋0.3 8 5.2 9 9 5.8 ＋＋ 0.1 7 3.6 8 4.6 Atrazine 1.25 ＋0 .3 7 4.6 8 4.4 ＋0.1 5 2.8 5 2.8 ─────────────────────────────────── No. 4 2.5 +0.3 8 5.2 8 5.2 + +0.1 6 2.8 7 4.0 Atrazine 1.25 +0.3 8 4.6 7 3.6 +0.1 4 1.9 4 2.0 ────────────────── ──────────────── No. 3 2.5 ＋0.3 8 5.2 8 8 5.1 ＋0.1 0.1 3.6 3.6 7 3.7 Atrazine 1.25 0.3 8 4.6 7 3.7 +0.1 5 2.8 4 1.9 ──────────────────────────────────

[0028]

[Table 7] Table 3 (continued) ────────────────────────────────── Treatment amount g / a Chigaya Mugwort drug ──────── ────────────────── Existing general formula Measured value Calculated value Measured value + I drug compound ────── ──────────────────────────── No. 5 2.5 +0.3 7 4.4 7 4.4 ++ 0.1 5 2.8 7 3.7 Ametrine 1.25 +0 .3 7 3.7 5 5 2.8 +0.1 4 1.9 4 1.9 ────────────────────────────────── No. 6 2.5 +0.3 7 4.4 7 4.4 + +0.1 5 2.8 7 3.7 Ametrine 1.25 +0.3 7 3.7 5 5 2.8 +0.1 3 1.9 4 1.9 ────────────────── ──────────────── No. 8 2.5 ＋0.3 8 5.2 ７ 4.4 ＋＋ 0.1 7 2.8 5 3.0 Ametrine 1.25 0.3 6 4.6 5 2.8 +0.1 4 1.9 3 1.0 ──────────────────────────────────

[0029]

[Table 8] Table 3 (continued) ────────────────────────────────── throughput g / a Chigaya Mugwort drug ──────── ────────────────── Existing general formula Measured value Calculated value Measured value + I drug compound ────── ──────────────────────────── No. 2 5 +0.3 7 4.4 7 4.4 ++ 0.1 0.1 5 2.8 7 3.7 Propazine 2.5 +0 .3 7 3.7 5 5 2.8 +0.1 4 1.9 4 1.9 ──────────────────────────────────── No. 3 5 ＋0.3 8 5.2 8 8 5.1 ＋＋ 0.1 7 3.6 7 3.7 Propazine 2.5 ＋0.3 8 4.6 7 3.7 ＋0.1 5 2.8 4 1.9 ─────────────────── ──────────────── No. 7 5 +0.3 8 5.2 7 4.4 ＋0.1 0.1 5 2.8 6 3.0 Propazine 2.5 ＋0 .3 7 4.6 6 2.8 +0.1 4 1.9 3 1.0 ───────────────────────────────────

[0030]

[Table 9] Table 3 (continued) ────────────────────────────────── Treatment amount g / a Chigaya Mugwort drug ──────── ────────────────── Existing general formula Measured value Calculated value Measured value + I drug compound ────── ──────────────────────────── No. 8 5 +0.3 8 5.2 7 4.4 + +0.1 5 2.8 6 3.0 Propazine 2.5 +0 .3 7 4.6 6 2.8 +0.1 4 1.9 4 1.0 ───────────────────────────────────

In the table, the calculated value indicates the expected value obtained from the Colby equation. As is clear from the above table, the composition of the present invention has a greater synergistic herbicidal activity than the simple sum of the activities of the compound represented by the general formula (I) and the conventionally known herbicides. In addition, the target weeds can be selectively and completely controlled with a low dose.

Claims (1)

[Claims] 1. A compound represented by formula (I) [wherein A, B and R each represent a lower alkyl group]. X and Y each independently represent a lower alkyl group or a lower alkoxy group, and Z represents a nitrogen atom or a = CH- group. ] Pyrazole sulfonylurea derivative represented by 2-chloro-4,6-bis (ethylamino) -s-triazine, 2-chloro-4-ethylamino-6-isopropylamino-s-triazine, 2-
A herbicide containing, as an active ingredient, methylthio-4-ethylamino-6-isopropylamino-s-triazine or one of 2-chloro-4,6-bis (isopropylamino) -s-triazine. Agent composition. [Chemical 1]