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ANTIFEEDANT ACTIVITY OF FOUR PLANT ESSENTIAL OILS AGAINST MAJOR STORED PRODUCT INSECT PESTS

Jyotika Brari* and Varun Kumar

Experiments were carried out in the laboratory to determine antifeedant activity of four plant essential oils of Rabdosia rugosa (Wall. ex Benth), Zanthoxylum armatum (DC.), Artemisia maritima (L.) and Colebrookea oppositifolia (Sm.) against four stored product insect pests viz. Tribolium castaneum (Herbst.), Sitophilus oryzae (L.), Stegobium paniceum (L.) and Plodia interpunctella (Hubner). Feeding deterrence indices (FDI) showed that the plant essential oils had antifeedant action against the four insect pests at different concentrations. R. rugosa and Z. armatum oil at a high concentration of 300 µl/g resulted in 5.22 ± 0.21 and 6.42 ± 0.32% grain damage as compared to 70.32 ± 0.28% damage under control and FDI of 86.17 ± 0.25 and 85.71 ± 0.27% was recorded for T. castaneum followed by S. oryzae with a FDI of 70.58 ± 0.21 and 67.68 ± 0.19% and grain damage of 15.42 ± 0.12 and 16.31 ± 0.21% as compared to 85.36 ± 0.09% grain damage in control for similar concentrations of above oils. A. maritima oil at 100 µl/g showed 76.31 ± 0.16% FDI followed by C. oppositifolia oil obtaining 75.11 ± 0.35% feeding deterrence against T. castaneum whereas 65.99 ± 0.32% and 65.46 ± 0.14% FDI was obtained for similar concentrations of these oils against S. oryzae. FDI of 62.82 ± 0.32 and 60.03 ± 0.26% was observed for R. rugosa and Z. armatum oil at 300 µl/g against S. paniceum followed by 64.97 ± 0.14 and 53.35 ± 0.18% against P. interpunctella for similar concentration of oils. The present study indicated that R. rugosa and Z. armatum were highly effective followed by A. maritima and C. oppositifolia against all the insect pest.