Bioactivity of an Ionic Liquid against Two Major Coleopteran Stored Grain Insect Pests
Introduction: Insecticidal efficacy of a monoterpene-based ionic liquid was evaluated against two Coleopteran insect pests, viz., the red flour beetle, Tribolium castaneum Herbst. and the drug store beetle, Stegobium paniceum (L). Methods: Bioassays for contact activity against adult insects, larvicidal activity, repellent activity, and antifeedant activity were conducted in the laboratory for the above said insect pests. Results: Ionic liquid at a highest concentration of 1.0 Î¼l/cm2 proved to be most effective against adults of S. paniceum producing 76.23 Â± 1.9% mortality while 70.12Â±3.5% mortality was obtained against T. castaneum after 72 h, respectively. T. castaneum larvae were most susceptible to all the doses of ionic liquid at a highest dose of 100 Î¼l/ml of ionic liquid 80.08 Â± 2.2 mortality was obtained followed by a mortality of 68.32Â±1.8% for S. paniceum among 8-10 day old larvae. Ionic liquid showed remarkable repellency at different doses of 2, 6 and 10 Î¼l/cm2 against both insect pests. For S. paniceum 75.45 Â± 1.9, 80.28 Â± 2.4 and 56.35 Â± 4.8% repellency was observed at 10 Î¼l/cm2 of ionic liquid after 3, 5 and 24 h. Ionic liquid proved to be effective seed protectant against both the insect pests. 87.99 Â± 0.14% FDI was recorded with 5.10 Â± 0.30 grain damage at 300 Î¼l/g of ionic liquid, respectively, while 72.32 Â± 0.18% grain damage was observed in control for T. castaneum.
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