缅甸马铃薯晚疫病的发生

摘要

晚疫病是缅甸马铃薯最严重的病害之一.在广泛种植雨季作物的山州高地,马铃薯晚疫病每年在7月至9月发生.在这个地区每年40%～50%的茎叶枯萎造成21%～46%的产量损失.因为在缅甸没有合适的抗晚疫病品种,所以用杀菌剂防治雨季作物的晚疫病.可是,农民因为应用杀菌剂昂贵,仅依靠早播躲避病害.他们惯用的方法是储存种薯,丢弃病薯和用大间距种植无病薯.%Late blight is one of the most destructive diseases of potato in Myanmar. Potato late blight appears annually during July to September in Shan State highlands where rainy crop is widely cultivated. In this area, 40%～50% foliar blight is found yearly causing 21%～46 % loss in yield. Since late blight resistant potato cultivar has not been available in Myanmar, fungicides are used to control the disease on rainy crop. Potato growers, however, rely on early sowing to escape the disease because of high cost of fungicide application. They also used to store seed tubers properly, discard infected tubers and plant disease free ones with wide spacing.