秋马铃薯晚疫病因其种植期间气候条件适宜,品种抗性下降,加上几乎每年都是连作,菌源大量积累等原因,致使发生普遍而严重,必须及早采取综合防治对策。1.发生特点通过这些年观察,该病均在发现中心病株后15天左右,病情迅速扩展蔓延,20天后,即可流行成灾,出现防不胜防的被动局面。低温多雨是晚疫病流行的重要条件,气温在10~15℃之间(阴雨、多雾、多露的天气),湿度90%以上,最有利于病菌的侵入、蔓延和病害的流行。尤其是马铃薯开花期及开花末期的降雨量大,病害更易发生。其次也 Autumn potato blight fall due to its suitable climatic conditions during planting, variety resistance decreased, coupled with almost every year for continuous crop, a large number of sources of accumulation and other reasons, resulting in widespread and serious, we must take comprehensive control measures as soon as possible. 1. Occurrence Through these years of observation, the disease were found in the center after about 15 days after the disease, the rapid spread of the spread of disease, 20 days later, you can epidemic, there is no chance of passive situation. Low temperature and raininess is an important condition for the late blight epidemic. The temperature is between 10 and 15 degrees centigrade (rainy, foggy and dew weather) and the humidity is more than 90%, which is most conducive to the invasion, spread and disease epidemic of bacteria. In particular, the flowering of potato and flowering end of the rainfall, disease is more likely to occur. Second, too