Indoor toxicity determination and field efficacy evaluation of Bacillus thuringiensis G033A against Colorado potato beetle
The Colorado potato beetle is an important pest in potato production in Xinjiang.To under-stand the control effect of Bacillus thuringiensis G033A wettable powder on the Colorado potato beetle,We tested the virulence of Colorado potato beetle larvae at different ages in the laboratory and their effi-cacy in the field in the present study.The results of laboratory bioassay showed that the LC50 values of lethal concentration of Bacillus thuringiensis G033A for the 1st,2nd,3rd and 4th instar larvae of Colorado potato beetle were 1.958,1.734,1.939 and 1.770g/L,respectively,demonstrating good indoor toxic activity.The results of the field experiment showed that the control effect of Bacillus thuringiensis G033A on the Colorado potato beetle reached 99％after 15 days of treatment,the quick effect and sustained effect were good.In conclusion,Bacillus thuringiensis G033A demonstrated a good control effect on the Colorado potato beetle,making it a viable option for controlling Colorado potato beetles in Xinjiang.
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