Bioassay of Beauveria bassiana, three plant oils and five biorational molecules against Callosobruchus chinensis L. in chick pea
Tarikul Islam and Md. Jamil Hossain Biswas
The present research was conducted to study the toxic effect of entomopathogenic fungus Beauveria bassiana, three essential plant oils i.e. neem (Azadirachtaindica A. Juss), mahogany (Swietenia mahagoni L.), and karanja oil (Millettia pinnata L.) and five biorational pesticides (spinosad, abamectin, emamectin benzoate, buprofezin and lufenuron) against adult Callosobruchus chinensis L. under laboratory conditions from January to October, 2016. Beauveria bassiana was found highly infectious and caused significant mortality of adult Callosobruchus chinensis populations after 24 hours of treatment application. Among the plant oils, karanja oil was found more toxic (LC50 values were 0.139, 0.093 and 0.075% at 24, 48 and 72 hours after treatment application respectively) in laboratory bioassay compared to neem and mahogany oil. In case of biorationals, abamectin showed highest toxicity (LC50 values were 0.081, 0.047 and 0.025% at 24, 48 and 72 hours after treatment application respectively) which was followed by emamectin benzoate and spinosad. However, Callosobruchus chinensis showed lowest susceptibility to buprofezin and lufenuron, two potential chitin synthesis inhibitors. The results of the present study clearly revealed that all the selected treatmentscould be successfully used as a grain protectant against Callosobruchus chinensis considering their LC50 estimates.
Tarikul Islam, Md. Jamil Hossain Biswas. Bioassay of Beauveria bassiana, three plant oils and five biorational molecules against Callosobruchus chinensis L. in chick pea. J Entomol Zool Stud 2017;5(3):516-519.