埼玉県の桑園におけるパラコート抵抗性のオオアレチノギクについて

概要

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1 . In mulberry fields located in Kumagaya City in Saitama Prefecture, in May 1986, studies were carried out on the biotype of Erigeron sumatrensis RETZ., a weed strongly resistant to paraquat. Based on data on the distribution of the weed in surrounding areas, the incidence was considered to be low on the whole and no zones with gregarious distribution as in the case of the Erigeron philadelphicus L. plants were observed. 2 . The degree oh discoloration of the leaves in relation to the concentration of paraquat was analysed in leaf discs dipped in a paraquat solution. Whereas the leaf discs of the plants tolerant to paraquat turned brown at a 1ppm concentration of paraquat within 48 hours, those of the plants resistant to paraquat preserved their green color even at a concentration of 10ppm and at 100ppm a faint brown discoloration was observed. Such a reaction was similar to that noted in the Erigeron philadelphicus L. and Erigeron canadensis L. plants resistant to paraquat. 3 . From the end of June to the beginning of July, 1988, studies on the distribution of Erigeron sumatrensis RETZ. plants resistant to paraquat were carried out in mulberry field corresponding to 243 sites in 5 areas located in the main sericultural zone of Saitama Prefecture. Resistant plants were observed in 54% of the sites where they had occureed.
日本雑草学会の論文
1989-10-30