Evaluation of some essential oils against insect pests of stored grain
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Date
2015-06
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Experiments were conducted in the Post-Harvest Entomology Laboratory of Department of Entomology, G.B. Pant University of Agriculture & Technology, Pantnagar, to test the fumigant toxicity of six essential oils against stored grain insect pests viz. Sitophilus oryzae, Rhyzopertha dominica, Tribolium castaneum, and Callosobruchus chinensis. Most of the essential oils suppressed the feeding and breeding of test insects. The efficacy of oil was classified in different categories on the basis of F1 progeny production. The essential oils inhibiting more than 90 per cent F1 progeny were classified as highly effective while inhibition of 80-89 and 70-79 per cent were catagorized as moderately and less effective, respectively. Essential oils showing less than 70 per cent F1 progeny suppression were ranked as least effective for the control of the insect pests.The adults of R. dominica and C. chinensis were most susceptible to fumigant action of all six oils at 0.10, 0.09, 0.08, 0.07, 0.06, and 0.50% concentration while S. oryzae was found susceptible only at higher concentrations.All treatments were found least effective against T. castaneum.The bio-efficacy of essential oil was dependent on dose and exposure period.
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