恩施市云南松毛虫发生规律的初步研究

Preliminary Study of Occurrence Regularity for Dendrolimus houi Lajonquiere in Enshi City

摘要:

云南松毛虫是恩施地区柏木类森林的一大害虫,该虫在恩施市1 a发生一代,以卵越冬,幼虫4月中旬开始孵化,4月下旬～5月初为盛期,7月下旬结茧化蛹,9月上旬出现成虫,10月中旬为羽化末期.卵在相对湿度低于75%时不能正常发育.雨量过多,空气湿度太大,不利于云南松毛虫的生长,同时增加微生物天敌的自然感染力,暴雨可导致大量幼虫死亡.风有助于幼虫的扩散和成虫的飞行.柏木纯林、阳坡、林缘、郁闭度小、阳光充足的林内发生严重.害虫大发生时天敌资源丰富,寄生蝇类和白僵菌为幼虫期和蛹期的重要天敌.营造混交林,保持良好的生态环境和保护天敌是控制害虫大发生最重要的措施.

Abstract:

Dendrolimus houi Lajonquiere is a major pest of Cupressus funebris Endi in Enshi,the insect in the region is one generation a year,on the eggs through the winter,and larva hatch from mid-April,late April to early May for the peak,in late July cocooning pupation,the adult in early September,mid-October to late emergence.Eggs can not be normal development in relative humidity lower than 75%.Excessive rainfall,or the humidity of too much air,is not conducive to the growth of Dendrolimus houi Lajonquiere,at the...