Abstract
When eggs of Culex quinquefasciatus Say were exposed to water treated with SIR 8514 (2-Chloro-N-[[[4-(trifluoromethoxy)phenyl]amino]carbonyl]benzamide] abnormal hatching (longitudinal split of shell or partial hatching) as well as ovicidal activity resulted; younger embryos (0.5–4.5h) were the most sensitive and older embryos (23.5 h) were tolerant. Abnormal hatching and ovicidal activity also were produced by baiting adults with SIR 8514 in sucrose. The compound showed no effect on egg hatchability when applied as a contact film to adult mosquitoes.