晚稻田白背飞虱和褐飞虱的发生动态

Dynamics of the Population of Whitebacked Planthoppers and Brown Planthoppers in Late Rice Fields

经过连续 3a的田间系统调查 ,结果表明 :广东省双季晚稻田稻飞虱田间种群消长曲线基本上为双峰型 ,发生盛期从 9月中旬到 10月上中旬 ;近年来稻飞虱混合种群中白背飞虱发生数量比率增大 ,在混合种群的发生趋势中起主导作用 ;稻飞虱混合种群与白背飞虱发生年度间表现为每 6a出现 1个高峰。

The population dynamics of the whitebacked planthoppers Sagatella furcifera (Horvath) and the brown planthoppers Nilaparvata lugens (Stl) in late rice fields were systematically investigated in Zhaoqing City, Guangdong Province. The research results showed that the population of those two insect pests reached 2 peaks,respectively at middle Sepetember and early and middly October.The population of the whitebacked planthoppers greatly increased in recent years. The population of whitebacked planthoppers and as a result,the total population of the planthoppers reaches a peak every 6 years. The dynamics of the total population of the planthoppers were different on different rice varieties.