防治病害是马铃薯生产上的关键问题。病毒病是马铃薯栽培的最大限制因素,所谓“种性退化”实际上就是各种病毒的侵染所致。马铃薯病毒种类很多,且田间表现症状不同,分布很广,严重影响了就地留种。一般马铃薯病毒病使其减产20％—50％,严重时达到80％以上。为了方便田间诊断,及时发现,及时处理,现将各种病毒病的田间发病症状及防治技术介绍如下: Disease control is a key issue in potato production. Virus disease is the biggest limiting factor in potato cultivation, the so-called “degenerative” is actually caused by a variety of viruses. There are many types of potato virus, and the performance of different symptoms in the field, is widely distributed, seriously affecting the local stay. General potato virus disease to reduce its production by 20% -50%, severe in more than 80%. In order to facilitate the field diagnosis, timely detection, timely treatment, now a variety of disease symptoms and prevention of disease in the field are as follows: