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通过4年调查和试验研究表明,天水地区夏秋期间,自生小麦苗上的白粉病发生普遍。有性世代闭囊壳,在本地不能活到冬麦出苗后直接侵染秋苗,但可在夏季存活期内侵染自生麦苗。这里距春麦区很近,春麦上的分生孢子有可能传来侵染自生麦苗。因此自生麦苗上的分生孢子,是冬麦秋苗的初侵染来源。冬麦早播病重晚播病轻,在海拔1590m的地方,10月7日播种,秋苗不发病。病菌以菌丝在麦苗中越冬,4月初先在阳坡地开始发展;4月是始发期,此后至5月中旬是普发期,5月下旬开始进入盛发期。并提出了病害流行的条件。
Through 4 years of investigation and experimental studies have shown that during the summer and autumn in Tianshui, the occurrence of powdery mildew on wheat seedling prevalence. Sexual generation closed shell, can not live in the local winter wheat directly after the emergence of autumn seedlings infected, but in the summer survival of infected self-born wheat seedling. It is close to the spring wheat area where the conidia on the spring wheat are likely to infect themselves with wheat germ. Therefore, the conidiospores on the spontaneous wheat seedlings are the source of the early infection of winter wheat autumn seedlings. Winter wheat early sowing late sowing light, at an altitude of 1590m, sowing on October 7, autumn seedlings not disease. Mycelium to mycelium wintering in wheat seedlings, early April beginning to develop in the sunny slope; April is the period of onset, since mid-May is a period of generalized period, early May into the Shengfa period. And put forward the conditions of disease epidemic.