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胡杨(Populus diversifolia Sehrenk.)苗期锈病(Melampsora pruinosae Tr-anz.)多年来在我区发生十分严重。秋季发病率常达100%,病情指数高达70—100,常造成幼苗大量枯死。国内其它胡杨种植地区也有类似情况。因此,能否有效地控制该病的发
Populus diversifolia Sehrenk. The seedling rust (Melampsora pruinosae Tr-anz.) Has been very serious in our district for many years. The incidence of autumn often up to 100%, the disease index as high as 70-100, often causing a lot of dead seedlings. Other domestic poplar cultivation areas have a similar situation. Therefore, the effective control of the disease hair