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Effect of sublethal doses of insecticides on the brown planthopper, Nilaparvata lugens Stal and mirid predator, Cyrtorhinus lividipennis Reuter



Effect of sublethal doses of insecticides on the brown planthopper, Nilaparvata lugens Stal and mirid predator, Cyrtorhinus lividipennis Reuter



Korean Journal of Applied Entomology 35(1): 52-57



This experiment was carried out to evaluate the effect of sublethal doses of BPMC, etofenprox, and buprofezin on N. lugens, and its predator C. lividipennis. Buprofezin was found to be the most toxic to N. lugens and the most safe to C. lividipennis among the three insecticides, based on LD-50 values. Selective toxicity index calculated by dividing LD-50 value of C. lividipennis by that of N. lugens indicated that buprofezin was very safe to C. lividipennis, showing selective toxicity of 2703.3. Longevity and fecundity of N. lugens treated with LD-10 and LD-40 of buprofezin and BPMC were not significantly different with those of untreated brown planthoppers. However, egg hatchability of N. lugens was greatly reduced when treated with LD-40. of buprofezin, having the highest inhibition rate of 17.7%. Hatchability of eggs from insects treated with BPMC was similar to that of control. The oviposited peak of treated hoppers appeared late as compared to the untreated which showed the peak at early part of the ovipositional period. The longevity and fecundity of C. lividipennis treated with BPMC were significantly reduced as compared with the untreated. Etofenprox also induced fecundity reduction when treated with LD-10, and LD-40. However, C. lividipennis treated with sublethal doses of buprofezin showed no reduction in longevity and fecundity. From these results, it may be said that buprofezin can be used to control brown planthopper without disrupting of C. lividipennis population in the rice field.

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