水稻褐飞虱灯诱种群数量动态分析

对广东肇庆病虫测报站24年褐飞虱灯诱种群数量变化进行分析,结果表明:褐飞虱各年的始见日在3月或4月内,始盛日在4月或5月内。年发生动态为双峰型,早稻高峰多在5月上旬至7月下旬,晚稻高峰多在9月中旬至11月下旬。终见日多在11月下旬。根据发生高峰的日诱获量、候平均诱获量、旬平均诱获量及全年累计数量比较各年发生严重程度,以20世纪70年代末至80年代中期褐飞虱发生重,而80年代末直至本世纪初发生趋轻。

Seasonal trends of light-trap collections of brown planthopper

Seasonal trends of light-trap collections of brown planthopper Nilaparvata lugens(Stal.)] in Zhaoqing city,Guangdong province was analyzed.The results showed that its first appearance was in March or April.The initial peak time was in April or May.There are two population peaks in one year: the first peak(early rice peak) occurred during early May to late July and the second peak(late rice peak) appeared during mid September to late November.According to the collections during the peak days,5-day accumulations,10-day accumulations and the seasonal total,the occurrence of brown planthopper was more serious in late 1970s and mid-1980s than in late 1980s and 1990s and even in the early years of this century.