埼玉県の桑園におけるパラコート抵抗性ハルジオンの分布実態と特性について

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Studies on the distribution and characteristics of Erigeron philadephicus L., a weed resistant to Paraquat were carried out in mulberry field located in Saitama Prefecture. 1 . The distribution of the Paraquat-resistant weed was studied in 235 and 243 sites in 1986 and 1988, respectively, in mulberry fields located in the main sericulture zone of the Prefecture. The rate of incidence of the weed was high, namely, 86 and 87% in the two surveys. Although the weed was widely distributed in the mulberry fields of the Prefecture, these figures were considerd to represent the peak of occurrence. Resistant plants weme recorded in 68% and 89% of the sites where occurrence was observed in 1986 and 1988, respectively. It is thus likely that this rate will increase in future. 2 . In the sites where only weeds tolerant to the herbicide appeared, the occupation rate was low whereas in the sites where only weeds resistant to the herbicide were observed, the occupation rate was very high and in many instances the weed became the predominant species. 3 . The changes in the distribution of resistant Erigeron philadelphicus L. plants in one sector of the mulberry fields were monitored during the period 1982-1988. It was found that the resistant plants tended to invade the field from the periphery to the center. The percentage of occurrence of resistance had increased from 30% to 96% during the 6 year period of observation. However, plants tolerant to the herdicide could still be recognized.
日本雑草学会の論文
1989-10-30

埼玉県の桑園におけるパラコート抵抗性ハルジオンの分布実態と特性について

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