褐飞虱田间种群数量动态研究

[目的]明确褐飞虱的发生规律。[方法]分析2007年秀山县水稻褐飞虱及其天敌的田间种群数量动态,并与1985~2006年的动态进行比较,研究褐飞虱的发生及危害规律。[结果]2007年褐飞虱总虫量的动态趋势与1985~2006年一致,水稻前期虫量偏小,7月下旬进入始盛期,8月10日达高峰。2007年成虫数量动态变化表现为始盛期提早,虫量激增期增幅较大,高峰期持续时间延长,后期虫量下降缓慢。2007年若虫总体变化趋势与1985~2006年基本一致,若虫数量7月20日进入始盛期,8月10日虫量最高。稻飞虱天敌的优势种群是蜘蛛,其次是黑肩绿肓蝽。[结论]秀山县褐飞虱危害盛期是8月上、中旬。

Study on the Dynamic of the Population Quantity of Brown Planthopper in Field

[Objective]To specify the occurrence law of brown planthopper,[Method] The dynamics of population quantity of brown planthopper and its natural enemy in rice field in Xiushan County in 2007 were analyzed and compared with that in 1985～2006 and the occurrence and damage law of brown planthopper were studied.[Result] The dynamic trend of total insect quantity of brown planthopper in 2007 accorded with that in 1985～2006.The insect quantity was a little small in rice prophase,the beginning period of its peak in late July and the peak was reached on the 10th of August.The dynamic change of adult quantity in 2007 showed that the beginning period of the peak was ahead of time,the increment of insect quantity was bigger in the sharply increasing period,the duration of peak period was extended and the insect quantity was decreased slowly in the anaphase.The total change trend of nymphae in 2007 basically accorded with that in 1985～2006.The beginning period of the peak of nymphae quantity was on the 20th of July and its peak was showed on the 10th of August.Spider was the dominant population in the natural enemies of rice planthopper and Cyrtorhinus lividipennis was secondary.[Conclusion] The damage peak period of brown planthopper in Xiushan County was early and middle August.