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据肇庆市 1 991～ 1 999年灯诱资料分析结果显示 ,该市近 1 0年白背飞虱种群数量上升 ,而且早稻虫量比晚稻大。白背飞虱在稻飞虱混合种群中的数量比例达 72 .6%～ 89.7%,形成数量优势的种群。季节数量消长显示 ,白背飞虱发生时间早 ,而且大部分虫量发生在水稻生长的前、中期 ,这段时间发生的总虫量约占早稻发生的 78.6%,而同期褐飞虱的发生数量只占早稻发生的 64 .9%。年变动趋势表明 ,白背飞虱已成为主导稻飞虱混合种群变化趋势的关键种群 ,并显示 4年周期的现象
According to Zhaoqing City, the light-induced material analysis from 1991 to 1999 shows that the population of white-backed planthoppers in the city has been increasing in recent 10 years and the amount of early-season rice is larger than that of late rice. The population proportion of whitebacked planthopper (Sogatella furcifera) in the mixed rice planthopper population was 72.6% ~ 89.7%, forming a number-dominant population. The decline of seasons showed that the time of whitebacked planthopper occurred earlier, and most of the insect pests occurred in the first and middle stages of rice growth. The total number of pests occurred in this period accounted for 78.6% of that in early rice, while the number of BPH only occurred in the same period Accounting for 64.9% of the early rice occurred. The trend of annual change shows that the whitebacked planthopper has become the key population that dominates the trend of the mixed population of planthopper and shows the phenomenon of 4-year cycle