湖南省稻飞虱发生为害特点及综合治理实践

CHARACTERISTICS OF RICE PLANTHOPPER OCCURRENCE AND PRACTICE OF INTEGRATE CONTROL IN HUNAN PROVINCE

根据湖南省历年稻飞虱测报资料，阐述稻飞虱在湖南省逐步加重，９０年代大发生频率达８０％，但地区间、年度间发生程度差异明显。分析影响１９９１～１９９７年全省稻飞虱发生程度的主要因子，外来虫源迁入时间早、虫量大，早稻期间气温偏高，晚稻期间盛夏不热、晚秋不凉有利发生。几年来，实施把稻飞虱作为水稻害虫防治的主攻对象，坚持从稻区生态系统整体出发，因地制宜地采取综合治理策略，取得了大面积控制为害，改善生态环境的效果。

The manyyearforecasting data of rice planthopper in Hunan province indicated that rice planthopper did more and more harm to rice in Hunan province, the frequency of great occurrence of rice planthopper was up to 80% during the 1990s, the degree of occurrence was great difference among areas and years. The primary factors effecting the degree of rice planthopper occurrence in Hunan province during 1991～1997 were deduced as foreign rice planthopper sources immigration was earlier and more quantitative, the temperature was higher during early season rice, but during late season rice,it was not hot in dog days and not cool in late autumn. Based on the condition of the hole paddy field ecological system, rice planthopper was looked as the main controlled object and the tactics of integrate control was carried on for several years. By using the factics, rice planthopper was controlled in good many areas and the ecological environment was improved greatly.