不同类型、不同程度的病毒性退化对马铃薯产量带有不同的影响,单纯计算退化株率,不能反应退化的程度和估计产量损失。有些研究工作者,曾根据病情轻重划分若干等级,采用加衡平均的方法,计算其退化指数(或病情指数),这种方法比用退化株率较于接近实际情况;但是,由于马铃薯的病毒种类很多,症状多种多样,并且往往几种毒病同时发生,而各种毒病对马铃薯的影响也不相同。在同样的病毒退化指数下,花皺叶或卷叶比重大的病田,要比花叶型多的减产重,这就更增加了病情 Different types and degrees of viral degradation have different effects on potato yield, simply calculating the rate of degenerated plants, the degree of inability to degenerate, and the estimated yield loss. Some researchers, according to the severity of the disease were divided into several levels, using the average method to calculate the degradation index (or disease index), this method is more than the rate of use of degraded strains closer to the actual situation; However, due to the virus of the potato There are many types, symptoms and diversity, and often several kinds of toxic diseases occur simultaneously, and various toxic diseases have different effects on the potato. Under the same virus degeneration index, the proportion of flowers with wrinkled leaves or curled leaves is much heavier than that of mosaic leaves, which further increases the disease rate