蜡蚧轮枝菌代谢粗提物对烟草上烟粉虱和烟蚜的杀虫活性

Insecticidal activity of crude metabolite extracts from Lecanicillium lecanii against Bemisia tabaci and Myzus persicae on tobacco

测定了3株蜡蚧轮枝菌Lecanicillium lecanii的代谢粗提物(toxin_(V3450)、toxin_(Vp28)、toxin_(Vl6063))对烟草两种害虫烟粉虱Bemisia tabaci和烟蚜Myzus persicae的杀虫活性。结果表明,3株菌株的代谢粗提物对烟粉虱3龄若虫和烟蚜无翅母蚜均具有较强杀虫活性,3株菌株的代谢粗提物对烟粉虱3龄若虫的LC_(50)分别为0.11%、0.23%和0.18%;对烟蚜的LC_(50)分别为0.14%、0.35%和0.29%。表明V3450菌株的代谢粗提物对烟粉虱3龄若虫和烟蚜的杀虫活性最强,Vp28菌株的代谢粗提物toxin_(Vp28)的杀虫活性次之,Vl6063菌株的代谢粗提物toxin_(Vl6063)杀虫活性最弱。

Crude metabolite toxins （ toxinva450, toxinvp2s and toxinv6063 ） extracted from LecaniciUium lecanii （ Fungi ： Hyphomycetes） strain V3450, V16063 and Vp28, respectively） were tested for contact toxicity activity against two tobacco pests Bemisia tabaci （Gennadius） （ Hemiptera, Aleyrodidae） and Myzus persicae （Sulzer） （ Hemiptera, Aphididae）. The results showed that crude metabolites extracted from 3 strains of L. Lecanii exhibited high insecticidal toxicity against the third instar nymphs of B. tabaci and wingless adults of M. persicae, with values of LCs0 to the third instar nymphs of B. tabaci were 0.11%, 0.23% and 0.18%, respectively; values of LCso to wingless adults of M. persicae 0. 14% , 0.35% and 0.29% , respectively. Toxinv3450 exhibited the highest insecticidal toxicity against the third instar nymphs of B. tabaci and wingless adult of M. persicae, followed by toxinvp28. Toxinv16o63 exhibited the lowest insecticidal toxicity against the third instar nymphs of B. tabaci and wingless adult of M. persicae.