Berries of a common weed found in India may be effective in fighting mosquitoes that spread dengue fever, a study has found. Synthetic insecticides are increasingly useless in fighting diseasespreading mosquitoes, such as the Stegomyia aegypti that can spread dengue and yellow fever viruses. In the online open-access journal BMC Complementary and Alternative Medicine, Indian scientists described how they used juice and extracts from the Solanum villosum weed and found it was particularly effective in eliminating Stegomyia aegypti larvae.