2001—2011年云南勐海三化螟种群动态规律

Population dynamics of Tryporyza incertulas(Walker) in Menghuai,Yunnan from 2001—2011

三化螟是云南西双版纳地区重要水稻害虫.研究于2001—2011年每年1—8月在勐海进行,采用黑光灯诱杀技术,对三化螟成虫种群数量进行系统调查.研究发现,从2001年以来,三化螟种群呈现逐年增长趋势.2011年三化螟种群数量达到历史最高记录,其在8月主要高峰期记录到成虫198 480头/hm2.三化螟种群每年有2次高峰期,2次高峰期出现的时间在每年的5—8月.主高峰期与次高峰期发生的先后次序和出现的月份因年而异.对三化螟种群数量主要影响因子进行相关因子分析和逐步回归分析发现,月降雨量对三化螟种群数量增长有一定影响.

Tryporyza incertulas （Walker） is a main rice pest insect in Xishuangbanna of Yunnan province. The population dynamics of T. incertulas was studied through blacklight traps in Menghai of Xishuangbanna from January to August every year from 2001 to 2011. The results showed that the population of T. incertulas kept on increasing since 2001 and reached 198 480/hm2 on August in 2011, which was the peak value from 2001 to 2011. The increasing of the population reached the peak twice every year on May and August. The highest peak and second peak occured in different months and different orders every year. By relevance analysis and stepwise regression analysis on main factors of influence for T. incertulas, monthly rainfall was found to be the main factor which influences the population fluctuation of T. incertulas.