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越冬代松毛虫是一年中松毛虫大发生危害的根源,白僵菌是目前南方防治越冬代松毛虫最广泛、效果最好的生物农药,冬季放菌比春季更好。一、提前在冬季放菌。使松毛虫幼虫带菌越冬,早感染发病,早死亡。用白僵菌防治松毛虫,从放菌到虫体感染致病死亡,这个侵染过程少则7天,多则两个月以上。在松毛虫越冬后出来危害松林甚至已肆虐成灾的3～4月份才放菌,这时虽然温湿度适宜于白僵菌繁殖,但因其需要一定时间才能使松毛虫致病死亡,因而往往出现“地上一片白,树上一片光”的情况(即发白的松毛虫死尸遍
Dendrolimus punctatus is the root cause of large detritus in the year. Beauveria bassiana is the most widely used and effective biopesticide in winter to prevent and cure the overwintering dendrolimus. The bacteriostasis in winter is better than the spring. First, pre-bacteria in winter. Dendrolimus larvae overwintering, infection early onset, early death. With Beauveria bassiana prevention and control of pine caterpillars, from the bacteriosis to parasitic infection pathogenic death, the infection process as little as 7 days, as many as two months or more. After the pine caterpillars overwintered hazmat pine forest outbreaks or even wreaked havoc in March ~ April only when the temperature and humidity suitable for Beauveria bassiana reproduction, but because it takes some time to make pine caterpillar died of disease, and therefore often Appear “on the ground a white, a light tree” situation (ie, white caterpillars dead times