论文部分内容阅读
马铃薯晚疫病是马铃薯病害中发生较为普遍,为害较为严重的一种病害,特别是在多雨、气候冷湿的年份,受害植株提前枯死,损失可达20%~40%。晚疫病在多雨年份易流行成灾。地势低洼排水不良的地块发病重,平地较垄地发病重。过分密植或株型高大可使小气候增加湿度,有利于发病。偏施氮肥引起植株徒长,或者土壤瘠薄缺氧或粘重土壤使植株生长衰弱,均有利于病害发生。增施钾肥可提高植株抗病性减轻病害发生。马铃薯的不同生育期对晚疫病的抗病力也不一致,一般幼苗抗病力强,而开花期前后最容易感病。叶片
Late blight is one of the more common and more damaging diseases in potato diseases. Especially in rainy and humid climates, the affected plants die early and lose up to 20-40%. Late blight is endemic in wet years. Low-lying low-lying poor drainage block incidence, the incidence of flat land more than ridge. Over-dense or plant-type can make microclimate increase humidity, is conducive to the incidence. Partial nitrogen fertilizer plant growth caused by impotence, or soil hypoxia or sticky soil so that plant growth and weakness, are conducive to disease. Increasing potassium fertilizer can improve plant disease resistance and reduce disease occurrence. The resistance to late blight in different growth stages of potato is also not consistent, and the seedling is generally resistant to disease and most susceptible to disease before and after flowering. blade