Laboratory evaluation of some indigenous plant extracts as grain protectant against red flour beetle, Tribolium castaneum Herbst
Kota Sathish and Pulin Patgiri
The present experiments were carried out in the laboratory of All India Co-ordinated Research Project on Post-Harvest Engineering &Technology (AICRP on PHE&T), Department of Agricultural Engineering, Assam Agricultural University, Jorhat-13, during the year 2014 – 2015 to evaluate the efficacy of Jatropha curcas and Ocimum sanctum leaves extracts as grain protectants against Tribolium castaneum. The effects of these plant extracts on percent mortality was recorded at 1, 3, 6, 12, 24, 48 and 72 hours after treatments and percent weight loss, in vitro adulticidal activity, percent weight gain over control and percent deterrent effect at 3, 6, 9 and 12 months after release of insects were observed. The highest mortality (70.00%) was recorded in Tulsi acetone extract which was followed by treatments with Jatropha petroleum ether (56.67%) after seventy two hours after treatment. In terms of weight loss Tulsi acetone extract (7.39%) was the most effective as far as weight loss was concerned and it was followed by treatment of Jatropha petroleum ether extract (7.94%) after the completion of twelve months of storage. Highest adulticidal activity was observed in wheat treated with Tulsi acetone extract (44.08%) and it was the most effective one after twelve months of storage. Tulsi acetone extract (43.05%) was again found to show the highest feeding deterrent effect after twelve months of storage of wheat. And it was followed once again by Jatropha petroleum ether (40.12%).