1995•Journal of Entomological ResearchRequires access
Control of maize stem borer, Chilo partellus (Swinhoe) by Bacillus thuringiensis based bioinsecticides
Veena Khanna, Vivek Kumar Gupta, Uma Kanta, H. S. Dhaliwal, Sant S. Sekhon
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Abstract
Spore-crystal (SC) preparations from 7 out of 9 Bacillus thuringiensis (BT) strains exhibited more than 90 per cent mortality in Chilo partellus (Swinhoe) larvae. The dose vs. mortality curve suggested that SC-preparation from BT strain HD-1 (94% mortality at 0.05 mg/ml level) proved to be the most effective bioinsecticide with lowest LD50 (7.62 x 10−4 mg/ml) for the control of C. partellus. Two other BT strains, viz., HD-73 and HD-263 with 97 and 99% larval mortality at 0.1 mg/ml level and LD50 values of 1.69 x 10−3 and 1.85 x 10−2 mg/ml, respectively also proved promising. The susceptibility of C. partellus Larvae declined with the age. Younger larvae (up to 56 h in age) exhibited high susceptibility to HD-1 SC-preparation. However, sharp decline in mortality was observed with ageing of larvae beyond 72 h.