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1.小麦白粉病的流行区有三种类型:(1)以分生孢子继代越夏为主要型式的终年流行区;(2)以闭囊壳休眠越夏、子囊孢子主要侵染秋苗的秋苗带菌越冬流行区;(3)以闭囊壳越夏、越冬,子囊孢子在春季侵染的春季侵染流行区。2.白粉病的发病程度,主要决定于春季的流行速度,影响流行速度的因素是:(1)大面积种植感病品种、品种抗性的退化和病菌新生理小种的出现,是病害大流行的基础;(2)气候是影响年度间病情轻重的主导因素。10℃以上天气出现早,21℃以上高温出现迟,则发病期长、病情重。过程性降雨有利病菌孢子的繁殖与侵入。病情与气候的关系有:多雨限制
1. There are three types of epidemic area of wheat powdery mildew: (1) the endemic perennial area with conidia sub-generation ascending summer; (2) Autumn seedlings overwintering endemic areas with bacteria; (3) to shell more summer, overwintering, ascospores in spring infection spring epidemic area. The incidence of powdery mildew mainly depends on the prevalence of spring epidemic. The factors influencing the prevalence of epidemic are: (1) the emergence of large-scale susceptible varieties, the resistance of varieties and the emergence of new germ-line races, Popular basis; (2) climate is the dominant factor affecting the severity of the disease during the year. Early weather above 10 ℃, late emergence of more than 21 ℃ high temperature, the incidence of a long period of illness. The process of rainfall beneficial bacteria spores breeding and invasion. Disease and climate are: rainy restrictions