甘肃省定西市马铃薯晚疫病发生及品种抗性评价

摘要

The research analyzed relationship between the major meteorological factors with the late blight of potatoes in Dingxi,and evaluated their resistances about different varieties to late blight at the same time.The results showed that the late blight of potatoes in Dingxi city was begun to appear at the beginning of August, and the full incidence period was in late August.The significant relation was observed between the disease index and temperature considering the humidity(P<0.05).Qingshu 9 and Zhuangshu 3 were suitable for local condi-tion,the yield were 1 467.40 and 1 371.06 kg/667 m2 ,the rate of emergence were 91.90% and 96.70%,the in-cidence of disease were 5.95% and 5.16%,the disease index of late blight were 44.56 and 33.92 respectively.%对定西市渭源县马铃薯晚疫病发生期主要气象因子与病害发生流行的关系进行了调查分析,并对7个主栽品种抗性进行了评价。结果表明：渭源县晚疫病8月初开始发生,下旬进入发病盛期,其病情指数与平均温、湿度综合因子之间存在显著的线性关系(P<0.05)；青薯9号和庄薯3号单产分别为1467.40、1371.06 kg/667 m2,出苗率分别为91.90%、96.70%,病薯率分别为5.95%、5.16%,晚疫病情指数分别为44.56和33.92,表明主栽品种适合在当地推广种植。