:Part I. Selectivity and Inhibitory Effect on Pigment Biosynthesis

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K-503 exhibits a higher herbicidal activity in the pre-emergence treatment than in the post-emergence treatment. Plants treated first display chlorosis along the veins of the leaf, followed by complete chlorosis and death of the leaf.The study was carried out to analyse the selectivity and inhibitory effect of K-503 on pigment biosynthesis.(1) In the greenhouse pot test, Digitaria adscendens, Setaria viridis, Portulaca oleracea, Amaranthus viridis, Polygonum lapathifolium, Cyperus microiria were completely controlled by a pre-emergence treatment of K-503 at the rate of 2.5g/a with no adverse effect on cotton and sunflower (Table 4).(2) The order of crop tolerance to K-503 in pre-planted soil incorporation treatment was as follows; cotton, sunflower>>soybean, radish>tomato, sugar beet>>rice>corn, wheat>cucumber (Table 5).(3) In the outdoor pot test, no phytotoxic effect on cotton and sunflower, irrespective of varieties, was detected in the pre-emergence treatment of K-503 at a rate of 60g/a (Table 6).(4) From the results of the field test, K-503 was considered to be a very promising new pre-emergence herbicide in cotton and sunflower fields (Table 7).(5) It was shown that K-503 inhibited the dehydrogenation reaction of phytofluene to ζ-carotene in the carotene biosynthesis, and caused the photodecomposition of chlorophyll under strong illumination (Fig. 1-4).
日本雑草学会の論文