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A method was developed to provide an alternative to sentinel mosquitoes for assessing efficacy of ultra-low volume (ULV) insecticide applications. A correlation (r2 = 0.793) exists between chlorpyrifos recovered from the screens of sentinel cages and mortality rates of confined adult female Aedes aegypti. Chromatographic methods were modified to accurately measure nanogram quantities of chlorpyrifos. The retention of 11 and 26 ng of chlorpyrifos/cm2 of nylon screen from the sentinel cages correlated with adult female Ae. aegypti mortality rates of 34 and 68%, respectively, 6 h posttreatment.

CORRELATION OF MORTALITY RATES OF AEDES AEGYPTI (DIPTERA: CULICIDAE) AND CHLORPYRIFOS DEPOSITED ON SENTINEL CAGE SCREEN MATERIAL1