青海省是我国马铃薯的重要产区之一。晚疫病在本省容易发病的地区最近十年中流行了五次(1954、1955、1958、1959、1961年)平均每两年流行一次,一般减产在20％左右。但也有经常不流行的地区可以被利用为免疫品种繁育的基地。 1.晚疫病在青海不同地区的流行规律: 晚疫病的流行与否,完全决定于当年的气候条件。由于青海省地形复杂,各地的发病条件也不一致。根据影响晚疫病流行的两大主要气候因素——相对湿度和温度,大致可以分为三类地区: 第一类地区为温度能经常满足病害流行要求。如东部农业区的川水和部分浅山地区(海拔 Qinghai Province is one of the most important producing areas for potatoes in China. Late blight is endemic five times over the last decade in areas prone to disease in the province (1954, 1955, 1958, 1959, 1961) and prevails every two years on average, with a general cut of about 20%. However, there are often areas that are not popular enough to be used as breeding bases for immunization. 1. The epidemic pattern of late blight in different regions of Qinghai: The epidemic of late blight is entirely determined by the climatic conditions of the year. Due to the complex terrain in Qinghai Province, the incidence of diseases is also inconsistent across the country. According to the two major climatic factors influencing the epidemic of late blight - relative humidity and temperature, they can be divided into three types of areas: the first type of area is the temperature that can often meet the epidemic requirements. Such as the eastern agricultural zone of Chuan Shui and part of the shallow mountain area (elevation