Larvicidal activity of oak Quercus infectoria Oliv. (Fagaceae) gall extracts against Anopheles stephensi Liston.
There is a growing interest in the use of botanical insecticides to reduce the use of synthetic pesticides in order to avoid environmental side effects. Anopheles stephensi is the primary vector of urban malaria, an endemic disease in India. So, an effort to assay An. stephensi larvae with gall extracts of Quercus infectoria was made under laboratory conditions at Mysore. Ethyl-acetate extract was found to be the most effective of all the five extracts tested for larvicidal activity against the fourth instar larvae, with LC(50) of 116.92 ppm followed by gallotannin, n-butanol, acetone, and methanol with LC(50) values of 124.62, 174.76, 299.26, and 364.61 ppm, respectively. The efficacy in killing mosquito larvae may make this plant promising for the development of new botanical larvicide.
Aivazi
Ali-Ashraf
AA
Department of Studies in Zoology, University of Mysore, Manasagangotri, Mysore, India.
Vijayan
V A
VA
D000818:Animals; D000852:Anopheles / Q000187:drug effects*; D005260:Female; D007194:India; D007306:Insecticides / Q000302:isolation & purification / Q000494:pharmacology*; D007814:Larva / Q000187:drug effects; D007928:Lethal Dose 50; D010936:Plant Extracts / Q000302:isolation & purification / Q000494:pharmacology*; D010941:Plant Tumors; D029963:Quercus / Q000737:chemistry*; D016019:Survival Analysis
D007306:Insecticides; D010936:Plant Extracts