利用白僵菌防治松褐天牛的试验研究

通过生物测定筛选出对松褐天牛毒力较高的菌株Bb202,用该菌株生产白僵菌无纺布菌条和高孢粉用于野外防治松褐天牛,结果表明,防治后松褐天牛的虫株率下降了0.9%,下降幅度达31.1%;无纺布菌条处理区解剖木中的幼虫死亡率为61.8%,高孢粉处理区为52.5%,对照区为45.6%.挂笼试验中,无纺布菌条处理区解剖木的幼虫死亡率为41.9%,高孢粉处理区为62.0%,对照区为32.3%,说明用白僵菌防治松褐天牛有一定的效果.

Field trial of application of Beauveria bassiana against Monochamus alternatus

From a bioassay for virulence of some entomogenous fungi against the larvae of the pine sawyer,Monochamus alternatus,Bb202 was chosen for production of non-woven fabric bands impregnated with B.bassiana.The bands and pure spores were used for field test.In the field plot,Bb202 was used in two different methods:hanging the fungal bands on pine trunks and spraying Bb202 spore powder.The results showed that the percentage of infested trees in the treated plot declined by 0.9% with the relative decline rate of 31.1%.The mortality of M.alternatus larvae was 61.8% in the fungal band plot,52.5% in the sprayed plot and 45.6% in control plot.In a cage test,the mortality of M.alternatus larvae was 41.9% in the fungal band plot,62.0% in the sprayed plot and 32.3% in control plot,suggesting that B.bassiana suppressed M.alternatus population obviously.