Insect body fluid immersion and leaf feeding impregnation methods were used to explore the effects of endophytic bacteria[Bacillus pumilus,Exiguobacterium sibiricum and two strains of Bacillus cereus(white and yellow)]on three tobacco pests(Myzus persicae,Spodoptera litura and Bemisia tabaci).The effects of these bacteria on the contact effect and litter size of M.persicae,the larval development and feeding rates of S.litura,and the contact effect of B.tabaci were assessed.The contact effect of E.sibiricum on M.persicae was significant.After 24 h of treatment,the highest corrected mortality was 26.67%at a 1∶10 dilution.E.sibiricum had a significant effect on the litter size of M.persicae.After 24 h of treatment,the minimum litter size of M.persicae was 3.33 individuals,which was reduced by 88.65%for the control at a dilution of 1∶10.However,these bacteria did not significantly affect the larval development rate of S.litura.The feeding rate of B.pumilus on S.litura was increased by 51.66%(73.73%)for the control at a dilution of 1∶10000 after 72 h.It was significant for B.cereus(yellow colony)on feeding rate of S.litura larve.The feeding rate of it was inhibited by 73.70%(8.33%)at a dilution of 1∶10000 after 72 h.These findings demonstrate the potential of endophytic bacteria as a biological control strategy for managing tobacco pests,thereby contributing to more sustainable agricultural practices.
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