【摘要】 20 0 1年从北碚、云阳、开县、万州、巫溪和忠县等地采集马铃薯晚疫病病叶 ,共分离得 94株致病疫霉。用生长速率法测定其对甲霜灵的抗性和抗性水平 ,结果表明 :2 0 2 %的菌株表现为抗性 ,11 7%的菌株表现为中抗 ,6 8 1%的菌株表现为敏感 ;以菌株PBB 110 2为敏感对照 ,所测定的 2株抗性菌株的抗性水平达 10 6倍以上 ,各地菌株抗性表现与菌株来源地的施药水平密切相关 ,并对抗药性不同的地区提出了不同的用药策略更多还原

【Abstract】 The causal agent of Late Blight of Potato(Phytophthora infestans)was isolated from potato leaves collected from Beibei, Yunyang, Kaixian,Wanzhou,Wuxi and Zhongxian in 2001. Total 94 isolates were obtained and tested for fungicide resistance and resistant level to metalaxyl by measuring the growth of the fungal colony. Results showed that 20 2% isolstes are resistant,11 7%isolates are intermediate in resistance and 68 1%isolates are sensitive to metalaxyl. The resistant levels of the two tested resistant isolates are much higher than that of the metalaxyl -sensitive isolate(PBB-1102).The resistant occurrence of isolates from different places is closely interrelated to the use of metalaxyl in these areas. The strategy for applying pesticide was put forward in connection with these areas.更多还原