论文部分内容阅读
通过近10年对中江县水稻螟虫种群变化特点的总结分析表明,水稻螟虫总体发生呈上升趋势。但是,自2005年开始其种群组成比率发生明显变化,由原来二化螟占优势变为二化螟、三化螟并重。引起种群变化的主要原因是生育期短于153 d的水稻品种大面积种植,使其始穗期与三化螟卵孵化盛期吻合,适宜蚁螟钻蛀为害,其次是由于防治不力,导致防效差、大量杀死天敌,使天敌失去自然控制能力。
Through the past 10 years, the population characteristics of rice stem borers in Zhongjiang County were summarized and analyzed. The results showed that the overall occurrence of rice stem borer was on the rise. However, since 2005, the percentage of its population changed significantly, from the dominant species of Chilo suppressalis to Chilo suppressalis, and Chilo suppressalis both. The main reason for the population changes is the large-scale planting of rice varieties with short growth period of less than 153 days, which agrees with the initial stage of egg hatching of S. trifoliata and is suitable for moth borer infestation, followed by ineffective prevention and control, Poor efficiency, killing a large number of natural enemies, so that natural enemies lose their ability to control.