Weather Forecast Model for Occurrence of Powdery Mildew on Xinyang Winter Wheat

The symptoms and seasonal prevalence situation of powdery mildew on Xinyang winter wheat were elaborated,the relations between powdery mildew morbidity rule and the meteorological condition were discussed,the morbidity reason of powdery mildew in Xinyang winter wheat area was reviewed.The weather forecast models for the occurrence area,starting time,damage degree and damage duration of wheat powdery mildew were established using the stepwise regression method,and the control countermeasures for powdery mildew were proposed.