Assessment of certain plant products toxixity against Sitophilus oryzae in milled rice grains in coastal Odisha

Abstract

The rice variety, Jyotirmayee was treated with plant products for the assessment of toxicity towards rice weevil Sitophilus oryzae in milled rice grains in the laboratory of Department of Entomology of College of Agriculture under Odisha University of agriculture and technology, Bhubaneswar in coastal climatic condition of Odisha. The toxicity assessment revealed that the average rate of mortality over the time and doses was significantly highest in black pepper with 81.86% mortality which was statistically at par with tobacco (80.37%), turmeric (70.00%) and chilli (68.51%). Theprobit analysis data revealed that at 24 HAT and 48 HAT the lowest LC50 value of 0.02 and 0.06% was recorded respectively in black pepper. But at 72 HAT the lowest LC50 value of 0.08% was recorded with chilli followed by turmeric (0.14%), black pepper (0.21%), eucalyptus (0.71%) and tobacco (0.95%).