Oviposition-Modifying Substances for Mosquitoes.
Annual summary rept. no. 1, Apr-Aug 79,
CALIFORNIA UNIV RIVERSIDE DEPT OF ENTOMOLOGY
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To prepare for the field evaluaiton of the previously identified oviposition repellants, their concentration-activity relationship and species specificity were studied. The magnitude of repellency of the repellents was found to be directionly proportional to their concentrations. Butyric acid, the major repellent component, was repellent to Cx. p. quinquefasciatus, Cx. tarsalis, Ae. aegypti, and An. quadrimaculatus at various concentrations. The acid was repellent to Cs. incidens at higher concentrations but attractive at lower concentrations. Sensory physiology studies showed that the chemoreceptors for the perception of butyric acid were located in the antennae which might be the most important sensory organ in mediating the negative ovipositional response of the mosquitoes to the repellents. The oviposition attractants produced by microbial fermentation of a chicken manure infusion were found to be distillable with steam and extractable with organic solvents. Isolation and identification of the oviposition attractants are currently under way.
- Anatomy and Physiology