Toxicity of a Neem (Azadirachta indica) insecticide to certain aquatic organisms
el-Shazly, M.M.; el-Sharnoubi, E.D.
Journal of the Egyptian Society of Parasitology 30(1): 221-231
2000
ISSN/ISBN: 1110-0583 PMID: 10786033 Document Number: 518513
The toxicity of an A. indica insecticide, Neem-Azal-T/S, was tested against Culicidae larvae, as well as against certain nontarget organisms found in a polluted pond and a shallow stream, located in a cultivated area in Giza, Egypt. Samples of water containing experimental animals were collected from this area, and toxicity tests were conducted in the laboratory by exposing them to a series of concentrations of the botanical insecticide. The compound was more or less toxic to all of the species tested. The LC50s and mortality rates were determined. The order of tolerance of the organisms to different concentrations of insecticide was: larvae of Bufo regularis > Aedes caspius > Gambusia affinis > Cyclops sp. > Daphnia magna. At a concentration of 20 ppm, all the tadpoles died within 9 days, while all other individuals died within 5 to 8 days after exposure to a concentration of 10 ppm of Neem Azal insecticide.