新除草剤HOK-7501に関する研究 : 第1報 HOK-7501および類縁化合物の化学的性質並びに除草作用について

概要

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Many aryloxythio carboxyric acid-derivatives were synthesized their herbicidal activities were examined. Relative activities among some derivatives of 2-methyl 4-chlorophenoxy thioacetic acid and differences of activites caused by changing the substituents on aromatic ring and alkylene branch were examined. 1. In irrigated water treatment methods most effective derivative were lower alkylesters. Thioamides and thioanilides were moderate effective derivatives. But these derivatives had a little selectivity among the weeds. The activities on slenderspikerush (Eleocharis acicularis L. R. & S.) were less than on those other weeds. Acid itself and salts had lower activities. 2. The tendency of relative activities of via the root and stem tests on slenderspikerush was the same as the tests of irrigated water treatment methods. 3. In via the roots test on rice plants the range of relative injury among each derivatives was smaller than that of relative effects on slenderspikerush. 4. As for the structure of aromatic-ring, 2-methyl 4-chloro type and 2,4-dichloro type had the highest activities. 2,4,5-trichloro type had less activities than those of the formers. 5. As for the alkylene-branch, acetic acid type had the highest activities, and α-propionic acid and butyric acid type had moderate activities. By the overall conclusion from these tests, we were determined to select HOK-7501 as herbicide for paddy field.
日本雑草学会の論文
1969-12-25