二化螟种群突增机制及控制对策研究

STUDY ON THE MECHANISM OF STRIPED RICE BORER POPULATION INCREASING SUDDENLY AND THE CONTROL TACTICS

通过 1 999年对二化螟种群在攸县稻区种植制中周年数量动态变化、嗜性和为害特征的观察 ,不同防治策略和防治方法的效果对比调查 ,结合当地影响其种群发生和为害的多个因子的综合分析认为 ,气候偏暖、粗秆品种的扩种、药剂防效的降低、螟虫繁殖力的提高及种植制度和作业方式的变更是近年二化螟种群突增和为害加重的重要诱因。并提出了“依托农业防治 ,突出科学用药”的控螟策略以及“狠治一、三代压基数 ,巧治二、四代减损失 ,重治桥梁田降低转化率”

The population dynamics of striped rice borer for a year round, acceptability, characteristics of damage were investigated, and the control effects of different tactics and methods were compared as well. The comprehensive analyzed result suggested that warmer climate, extension of rice cultivars with bigger stem, lowering of chemical control effect, increasing of striped rice borer's reproduction and the change of farming system should be the inducible reason of striped rice borer population increasing suddenly and severe damage. Based on the investigation and analysis mentioned above, the strategies of “based on agricultural control, emphasises on scientific chemical control” and the full year round tactics of “main control the first and the third generation for reducing the initial population, suitable control of the second and the fourth generation for reducing yield loss, main control bridging rice field for lowering the ratio of the changing generation” were put forward.