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云南各马铃薯生产区域的气候存在很大差异,使马铃薯晚疫病发生具有明显的区域特点。可以分为晚疫病高发生区,该区以昭通及海拔2200m以上的高寒山区为主,特点是多雨、多雾及寡日照,5月份就进入雨季,在植株生长的77d中,RH≥90%的天数达到35d。因此是晚疫病发生最早、最容易发生流行危害的区域。晚疫病常发生区,以滇中曲靖、昆明等2000m左右的山区为主,特点是在6月初有一个降水过程,病菌初次侵染开始,是否造成危害,受6月连续降水量,病原二次侵染程度的影响。晚疫病轻发生区域,以迪庆等3300m左右的高原地区为主,特点是植株种植季低温、低湿,湿度RH≤88%,限制了病害的流行。根据各区域的病害发生特点,可以制定相应的防治措施。调查结果表明,病害发生的时间与植株的生育期决定危害程度,在植株盛花期发生病害是重病的年份。
There is a big difference in the climate of each potato producing area in Yunnan, which makes the emergence of potato late blight have obvious regional characteristics. It can be divided into the high occurrence area of late blight, the area is Zhaotong and the alpine mountain area above 2200m above sea level, which is characterized by rainy, foggy and widowed sunshine. It enters the rainy season in May. During 77d of plant growth, RH≥90% The number of days reached 35d. Therefore, the earliest occurrence of late blight, the most prone to epidemics of the region. Late blight often occurs in areas such as Qujing, Kunming, about 2000m mountains in Yunnan, characterized by a precipitation process in early June, the initial infection of bacteria, whether causing harm, by the June continuous precipitation, the second pathogen The impact of infection. Occurrence of late blight light areas, such as diqing about 3300m plateau area is characterized by plant growth season low temperature, low humidity, humidity RH ≤ 88%, limiting the disease epidemic. According to the characteristics of the disease in each region, we can formulate corresponding control measures. The survey results showed that the time of disease occurrence and the growth period of the plant determine the degree of harm, and the occurrence of the disease in the full bloom of the plant is a serious disease year.