研究内蒙古西部马铃薯主产区马铃薯晚疫病菌的交配型组成及对3种常用杀菌剂的敏感性,为生产上防治马铃薯晚疫病提供依据.2008年从内蒙古西部马铃薯主产区分离94个马铃薯晚疫病菌株中,测定其交配型,结果表明,82株为A1交配型,占被测菌株的87.2％；8株为A2交配型,占被测菌株的8.5％；4株为A1A2交配型,占被测菌株的4.3％；13株为自育型,占被测菌株的13.8％.其中,在呼和浩特地区有7株A2交配型,在乌兰察布有1株,说明在内蒙古西部马铃薯产区均存在A2交配型.94个菌株对甲霜灵的敏感性测定表明,表现高抗的占91.49％,中抗占8.51％,没有发现敏感菌株.同时发现甲霜灵可刺激某些抗性菌株的生长.试验还测定了14株菌对烯酰吗啉和28个菌株对霜霉威盐酸盐氟吡菌胺(银法利)的敏感性:其中晚疫病菌对烯酰吗啉的EC50值分布于0.002 ～0.021μg/mL,平均EC50值为0.005 μg/mL;对霜霉威盐酸盐·氟吡菌胺(银法利)的EC50值分布于0.081～0.192 μg/mL,平均EC50值为0.143 μg/mL;所测菌株对2种药剂全部表现敏感,且烯酰吗啉和银法利与甲霜灵均无交互抗性.%The isolates of Phytophthora infestans were collected from the west of Inner Mongolia in 2008. The mating type and response of the isolates to three chemicals were then determined. Among 94 isolates tested,82 isolates belonged to Al mating type,accounting for 87.2% ;8 was A2 mating type,accounting for 8.5% ;4 was A1A2 mating type,accounting for 4. 3% ;13 was self-fertil mating type,accounting for 13. 8% . Seven strains of A2 mating type were detected in Hohhot area and only one was detected in wulanchabu, This result showed that A2 mating Type existed in potato producing area in the west of Inner Mongolia. Among 94 isolates tested,91. 49% were highly resistant,8.51 % were intermediate resistant. No isolate resistant were sensitive. Also it was found that the vegetative growth of some re sistant isolates was stimulated by metalaxyl. The sensitivity of 14 isolates to dimethomorph and 28 isolates to silver power with different levels of metalaxyl resistance were determined. EC50 values ranged from 0. 002 μg/mL to 0. 021 μg/mL to dimethomorph,the mean EC50 values was 0. 005 μ,g/mL;EC50 values ranged from 0.081 μg/mL to 0. 192 μg/mL to silver power, the mean EC50 values was 0. 143 μg/mL,and the resistance to metalaxyl did not correlate to the resistance to dimethomorph or silver power.
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