小麦根腐叶枯发病期很长,发病程度受当年气象因子影响很大,为减少盲目喷药所造成的损失和提高药剂防治效果,本文介绍两种预测方法。一、流行起点预测法根腐叶枯流行程度是以蜡熟期叶部病情指数来确定,但药剂防治适期是小麦杨花至灌浆期,因此,必须在这阶段对蜡熟期的发 Wheat root rot has a long onset period and the degree of its occurrence is greatly affected by the meteorological factors of the year. In order to reduce the losses caused by blind spraying and improve the control effect of the pesticides, two prediction methods are introduced in this paper. First, the epidemic of the starting point of the forecast method Root rot rot degree is based on the disease index of waxy stage leaves to determine, but the drug control period is wheat poplar to filling stage, therefore, at this stage of the wax maturity of the hair