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近年来,随着小麦产量水平的不断提高,栽培条件也有变化,氮肥使用量增多,小麦群体大,田间郁蔽,通风透光不良,加之目前推广的小麦品种大部分都不抗病,因此,小麦白粉病(Erysiphe grsminis DG.f.sp.tritici)已成为常发性病害,对小麦生产威胁很大,一般年份减产1—2成,重达3成以上。1990年和1991年我县小麦白粉病大流行,全县发生面积近43万亩,占小麦种植面积的85%左右,虽然经过广泛发动群众进行防治,
In recent years, with the continuous improvement of the level of wheat production, the cultivation conditions have also changed, the amount of nitrogen fertilizer increased, the wheat population was large, the field was shaded, the ventilation and light were poor, and most of the wheat varieties promoted at present are not disease-resistant. Therefore, Wheat powdery mildew (Erysiphe grsminis DG.f.sp.tritici) has become a frequently-occurring disease that threatens the production of wheat. In general, the annual yield is reduced by 1-2% and the weight is over 30%. In 1990 and 1991, my county wheat powdery mildew pandemic occurred in the county area of nearly 430,000 mu, accounting for about 85% of the wheat planted area, although after a broad mobilization of prevention and control of the masses,