水稻褐飞虱灯下发生期及种群数量动态分析

采用普通白炽灯诱法对贵州省江口县迁飞性害虫褐飞虱进行诱集,并根据历史数据分析该地区水稻褐飞虱灯下发生期及灯诱数量。结果显示,褐飞虱各年的始见日多出现在4月下旬至5月上旬,始盛日多出现在6月中旬至7月中旬,该虫年发生动态为双峰型,早稻高峰期多在7月下旬至8月下旬,晚稻高峰期多在9月至10月;近年来,褐飞虱始盛日和高峰期都有提前的趋势;高峰期日最高诱获量、候平均诱获量、旬平均诱获量及全年累计诱获量之间存在明显相关性,相关系数为早稻0.9579～0.9861,晚稻0.8675～0.9772;根据25年的资料,前15年(1977—1992年,其中缺1988年资料)全年最高峰主要出现在晚稻期间,出现在早稻期间的仅有5年,后10年(1993—2007年,其中缺2000—2004年资料)全年最高峰则全部出现在早稻期间;以高峰期候平均诱获量为指标,在25年中,大发生、中偏重发生、中等发生的各有5年,中偏轻发生的有2年,轻发生的有8年,这与当地田间的发生为害情况基本一致。

Population dynamics and occurrence period of brown planthoppers based on the historic data analysis of light trap catches

The migratory pest brown planthopper,Nilaparvata lugens,was trapped by using ordinary incandescent light from 1977 to 2007 in Jiangkou,Guizhou Province.Population dynamics and occurrence period of the pest based on the historic data of this area was analyzed.The results showed that its first occurrence date was in late April to May and the initial outbreak date was in June to July.There were two occurrence peaks in one year:the first peak(early rice peak) appeared in late July to late August and the second peak(late rice peak) appeared in September to October.In recent years,the first appearance date,initial outbreak date and peak period had the tendency of advancing.There were obvious correlation among the catches of the peak day,the peak five-day,the peak ten-day and the seasonal total,and the correlation coefficients are 0.9579-0.9861 and 0.8675-0.9772 for early rice and late rice respectively.According to the data of 25 years,the yearly occurrence peak appeared on late rice except 5 years in the previous 15 years and all appeared on early rice in latter 10 years lacking the data of 1988 and 2000 to 2004.Taking the catches of peak five-day as the quantification index,5 years occurred greatly,5 years greatly to moderately,5 years moderately,2 years moderately to slightly and 8 years slightly.The above result is almost consistent with occurrence situation of brown planthoppers in paddy fields.