Combination larvicidal action of Solanum xanthocarpum extract and certain synthetic insecticides against filarial vector, Culex quinquefasciatus (SAY).

The combination activities of temephos, fenthion and petroleum ether extract of Solanum xanthocarpum were observed for their larvicidal activities against Culex quinquefasciatus. The combination of temephos and S. xanthocarpum was studied at ratios of 1:1, 1:2, and 1:4. Similar ratios were also used for the combination of fenthion and S. xanthocarpum. The temephos/plant extract combination acted antagonistically. The combination of fenthion and plant extract acted synergistically against the target organisms at a ratio of 1:1, which showed the best results of: LC50 0.0144 and 0.0056 ppm and LC90 0.0958 and 0.0209 ppm at 24 and 48 hours, respectively. The present study will be helpful in developing a commercial formulation for effective vector management.