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Residual and biological effects of buprofezin(25% WP) on the larvae of the brown planthopper(BPH), Ni/aparvata /ugens SUlI, were studied by pot experiments. Residual lethal effects on the 2nd instar larvae lasted significantly long, and were higher with application rates. The rate of 17.50 g a.i./10...

Residual and biological effects of buprofezin(25% WP) on the larvae of the brown planthopper(BPH), Ni/aparvata /ugens SUlI, were studied by pot experiments. Residual lethal effects on the 2nd instar larvae lasted significantly long, and were higher with application rates. The rate of 17.50 g a.i./10a showed ca. 90% mortality even on 35 days after treatment (OAT). $RLT_{90}$ and $RLT_{50}$(residual lethal time that can show 90% and 50% mortality, respectively) with rates of 5.78-11.50 g a.i./lOa were 9.0-13.5, and 16.8-22.8 days, respectively. It was estimated that 13.00 and 4.44 g a.i./lOa were the rates of buprofezin which could show mortalities of 2nd instar BPH larvae above 95% and 50% until 15 OAT, respectively. The residual lethal effect of 7.00 g a.i./10a on the 1st instar BPH larvae was 100 % even on 17 OAT. $RLT_{50}$ was 32.5 days which was 15 days longer than $RLT_{50}$ for the 2nd instar larvae. Buprofezin with 7.0 g a.i./lOa showed 100% and 70% mortality for 1st-4th and 5th instar BPH larvae, respectively. Longevity of a female BPH which emerged from the 5th instar larvae treated by buprofezin was greatly reduced, and its fecundity was nearly zero.

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