JPS6021563B2 - Field herbicide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to field herbicides with improved action.

Pyritazine-based, carbamate-based, triazine-based, toluidine-based, acid amide-based, and diazine-based compounds are used as field herbicides, but their effectiveness varies depending on soil conditions, weed types, etc. It is impossible to completely control it.

None of the existing herbicides can satisfy the control of each type of weed, and it is necessary to apply several types of chemicals several times, which requires a great deal of effort in weeding. Under these circumstances, there is a demand for a herbicide that can accurately control major weeds that occur during all seasons with a single treatment. The present invention provides 2-[1-(2,5-dimethylphenyl) represented by the following formula.
-ethylsulfonyl]-pyridine-1-oxide and a triazine compound represented by the general formula (in the formula, x represents a halogen atom or a methylthio group, and R represents a lower alkyl group) as active ingredients.

The triazine compound of formula (2) is preferably 2-chloro-4,6-bis(ethylamino)-s-triazine (compound oa) or 2-methylthio-4,6-bis(
isopropylamino)-s-triazine (compound ob)
is used. Two or more compounds of formula 0 can also be used in combination. Compound 1, which is the active ingredient of the herbicide of the present invention, is highly effective against annual grasses and weeds of the cyperaceae family, such as blackberry, hackberry, and cyperus; is insufficient. On the other hand, the compound Kawama is an absorption-type triazine herbicide that exhibits herbicidal action by inhibiting photosynthesis, and is highly effective against annual broad-leaved weeds such as purslane, pomegranate, and dogweed.
It has poor efficacy against grains such as cyperus and cyperus and weeds of the cyperaceae family. However, the combined use of Compound 1 and Compound RO shows an unexpectedly excellent effect on all major annual weeds in fields, and these weeds can be completely controlled with a single treatment.

In addition, due to the synergistic effect of these compounds, the potency against each type of grass is significantly increased, so the amount used of each component can be reduced by half.
It can be reduced to ~1'3 or less. Therefore, chemical damage to fine crops can be reduced to such an extent that the growth and yield of the crops are not affected at all. By applying the herbicide of the present invention to the soil before and after sowing field crops and before and after planting, it can eliminate rice weeds at low application rates that cause almost no phytotoxicity to legumes, fruit vegetables, hollyhocks, industrial vegetables, etc. It exhibits particularly excellent herbicidal effects against grasshoppers, crabgrass, etc., and broad-leaved weeds such as pigweed, polygonum, and purslane. Compound 1 and Kawama 1: 0.1-1
．． It is preferable to use them together at a weight ratio of 0.

The amount used varies depending on the applicable crop, target grass species, application time, application method, and soil conditions, but per 1 are 5 to 30 doses of active ingredient, 20 to 50 doses of wettable powder, and 20 to 30 percent of granules are used as granules.
50 to 750 evenings is preferable. The herbicide of the present invention is compound 1
Although a mixture of Compound 0 and Compound 0 may be used as is, it is usually mixed with a carrier or diluent, and optionally with an adjuvant to formulate into a wettable powder, granules, etc. before use.

In addition, insecticides, fungicides, plant regulators, etc. can also be added. As carriers or diluents, the usual solid or liquid substances commonly used in agrochemicals can be used.

Examples of solid carriers include clay, talc, turquoise clay, bentonite, etc., or mixtures thereof, and liquid carriers include:
Examples include water, alcohols, ketones, benzene, toluene, xylene, etc., or mixtures thereof. As the auxiliary agent, a wetting agent, a fixing agent, a dispersing agent, an emulsifier, etc. are used. Parts in the following examples mean parts by weight. Example 1 (Wettable powder) Compound 14 no Miyako, 14 parts of compound OA, 2 parts of sodium alkylbenzenesulfonate, 2 parts of sodium ligninsulfonate
1 part of white carbon, and 36 parts of diatoms were uniformly mixed and pulverized to prepare a wettable powder.

Example 2 (hydrating powder) Compound 14 Ikarito, Compound B2 Sodium, alkylben 0 2 parts of sodium sulfonate, 2 parts of sodium ligninsulfonate
1 part of white carbon and ±26 parts of diatoms are uniformly mixed and pulverized to prepare a wettable powder.

Example 3 (granules) 13 parts of compound, compound oao. 8 parts of sodium lauryl sulfate, 0.3 parts of lignin sulfonate, 30 parts of bentonite and 63.9 parts of clay were uniformly mixed and pulverized, an appropriate amount of water was added and the mixture was brazed, and granulated using a granulator. Granulate, dry, and size to make granules.

Example 4 (Granule) 13 parts of compound, part of compound obl, 0 sodium lauryl sulfate
．． 4 parts of lignin sulfonate, 3 parts of bentonite, and 61.7 parts of clay were uniformly mixed and pulverized, an appropriate amount of water was added and the mixture was brazed, granulated using a granulator, dried, and sized. Grind into granules.

Test Example 1 (Upland soil treatment test) A wooden box of 1/1000 are was filled with upland soil, seeds of various weeds were sown, and after covering, a wettable powder produced according to Example 1 was added with water. It was diluted and a prescribed amount was applied to the soil surface using a hand sprayer.

Thereafter, they were grown in a greenhouse, and on the 20th day after treatment, one remaining weed was pulled out and air-dried, the dry weight was measured, and the weed rate (%) was calculated using the following formula. The results are shown in Table 1. Remaining grass rate (%) i Wind-dried dry weight of untreated area (daytime)
・〇.

The numerical values shown in parentheses for the mixture area in the table are expected values calculated using Colby's formula described in Weeds No. IS Lid, pages 20-22 (1967). If the actual remaining grass rate is below this value, it is recognized that there is a synergistic effect. The Mokuji in parentheses for Mushori-ku in Table 1 is the air-dried weight of remaining grass per box (9
) Test Example 2 (Phytotoxicity Test) After filling a 1/1000 are wooden box with upland soil, sowing various crops, and covering the soil with soil, or before planting the seedlings, hydration produced according to Example 1 was used. A predetermined amount of the agent was applied to the soil using a hand sprayer.

Thereafter, they were grown in a greenhouse, and on the 20th day after treatment, the degree of chemical damage was investigated according to the following criteria. The results are shown in Table 2. -: Harmless H: Medium ±: Slight harm River: Severe damage 10: Slight damage ×: Withering Table 2

Claims (1)

[Claims] 1 2-[1-(2,5-dimethylphenyl)-ethylsulfonyl]-pyridine-1-oxide and general formula ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (In the formula, X is halogen A herbicide for field cultivation, characterized in that it contains a triazine compound represented by an atom or a methylthio group (R represents a lower alkyl group) as an active ingredient.