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小麦白粉菌(Blumeria graminis DC.Speer)可以在我国东北的南部冬麦区以菌丝垫形态潜伏在小麦苗基部叶片和叶鞘上越冬,以混在干燥保存的小麦种子中的闭囊壳越夏。自生麦苗和白粉病的野生寄主在侵染循环中不起作用。小麦白粉菌的毒力频率(Vf)分析表明,公主岭、沈阳、海城、大连和烟台的小麦白粉菌同属于一个群体。东北春麦区小麦白粉病初发日期和高空天气图分析表明,东北春麦区小麦白粉病的初侵染菌源来自胶东半岛冬麦区。在一定的天气系统控制下,小麦白粉菌的分生孢子随夏初的偏南气流,在700毫巴高度层向北传播,进入东北春麦区。随降雨沉降,并侵染小麦植株。
Blumeria graminis DC.Speer can lurk on the basal leaves and leaf sheaths of wheat seedlings in the form of mycelium mat in the winter wheat field in the south of our country to catch the summer in the closed shell of the dried preserved wheat seeds. Wild hosts of volunteer wheat germ and powdery mildew have no role in the infection cycle. The virulence frequency (Vf) analysis of wheat powdery mildew showed that the powdery mildew of Gongzhuling, Shenyang, Haicheng, Dalian and Yantai belongs to one group. The analysis of the initial dates of wheat powdery mildew and the weather maps in northeast Chunmai showed that the primary source of wheat powdery mildew in northeastern China was from winter wheat in Jiaodong Peninsula. Under the control of a certain weather system, the conidia of wheat powdery mildew spread along with the southerly airstream at the beginning of summer in the altitude of 700 mb to the northeast spring wheat area. Settle with rainfall and infect wheat plants.