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永善县是云南省、昭通地区马铃薯癌肿病发病中心之一。70年代初就有零星发生,1984年达到高峰,该年全县发生112个乡,面积达8683亩,损失率在30%左右。近几年通过推广优良抗癌马铃薯品种,品比4号,77—克实单选一号,4043—①,马铃薯癌肿发生面积逐步减少,1985年发生面积为6467亩,1986年为3054亩,1987年为2893亩。马铃薯癌肿发生最早最严重的马楠区,1987年基本上全部种植了抗癌品种,亩产量平均在2000kg 以上,较当地感
Yongshan County, Yunnan Province, Zhaotong area is one of the incidence of cancer centers of potato disease. In the early 1970s, sporadic accidents occurred and reached a peak in 1984. In that year, 112 townships occurred in the county with an area of 8,683 mu and a loss rate of 30%. In recent years, through the promotion of excellent anti-cancer potato varieties, the ratio of No. 4, 77-grams of a real number one, 4043-①, potato cancer area gradually reduced in 1985 occurred an area of 6467 acres in 1986 to 3054 acres , 2893 acres in 1987. The earliest and most serious potato cancer occurred in Ma Nan district. In 1987, almost all of the anti-cancer varieties were planted. The average yield per mu was above 2000 kg,