受本地耕作制度调整和气候环境变化的影响,近十几年来武宁县一季稻病虫结构和种群数量发生了较大的变化,突出的特点是优势种群螟虫常年为害重;纹枯病常年偏重,稻瘟病近年进入高发期;“两迁”害虫为害频率明显加大,致 Affected by the adjustment of local farming system and the change of climatic and environmental conditions, the structure and population of pests and diseases in the first crop of rice in Wuning County have changed greatly in recent ten years. The outstanding characteristic is that pests of dominant populations are perennial pests, Rice blast in recent years into the high incidence period; “two move ” pest damage frequency is obviously increased, caused