Effects of Buprofezin (Applaud(R)) on the oviposition and the life span of Nilaparvata lugens were examined at sub-lethal doses. The reference compound, deltamethrin, enhanced the number of ovarioles, eggs laid and the life span of female adults, when insects were exposured to sub-lethal doses (0. 4-0. 00064 ppm) of the chemical from 5th instar stage. On the other hand, Buprofezin hardly increased or somewhat decreased the oviposition and the life span of female adults at sub-lethal doses (below 0. 4 ppm) in the same exposure-treatment as above. These properties of buprofezin probably play important roles in the prevention of the resurgence of N. lugens along with a little adverce effects on the natural enemies and non-target species.

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