通过对小麦白粉病１４ａ的发生情况研究分析，初步明确影响豫北麦区小麦白粉病流行的主要因素和主要预测因子是当年早春３月中旬的菌源基数、３～４月份降水量和日照时数，提出了病害中期预测的综合分析预测法和预测指标，建立了病害发生程度预测式，经１９９４～１９９５年预测检验，表明预测结果与发生实际基本一致 Based on the analysis of occurrence and occurrence of wheat powdery mildew 14a, the main factors and the main predictors of wheat powdery mildew prevalence in the wheat areas of Henan Province were initially identified. The results were the number of bacteria source in early March and the precipitation in April and April and sunshine time This paper proposes a comprehensive analysis and prediction method and prediction index of mid-term disease prediction, and establishes a prediction formula of the occurrence degree of the disease. After the 1994-1995 forecast, it shows that the prediction result is basically consistent with the actual occurrence