洋芋在我省农业生产中占有极其重要的地位,随着我省农业生产的发展和耕作制度的改革,洋芋无疑地是个不断发展的粮食作物。当前洋芋生产上的严重问题,是病毒性退化。据一九七三至一九七四年,在天水、定西、武威三地区,九个(武威、天祝、古浪、景泰、永昌、民勤、天水、定西、临洮等)县的二十五个公社,四十九个生产队调查,田间发病情况:一般发病率40—60％,最高100％;病情指数一般30—40,最高 Potato in our province agricultural production occupies an extremely important position, with the development of agricultural production in our province and farming system reform, potato is undoubtedly a growing food crops. The current serious problem of potato production is viral degradation. From 1973 to 1974, in Tianshui, Dingxi and Wuwei districts, twenty of the nine counties (Wuwei, Tianzhu, Gulang, Jingtai, Yongchang, Minqin, Tianshui, Dingxi and Linqu) Five communes, forty-nine production team investigation, the incidence of the field: the general incidence of 40-60%, up to 100%; condition index generally 30-40, the highest