PREIMAGINAL DEVELOPMENT, ADULT LONGEVITY AND FECUNDITY OF ENCARSIA-INARON (HYM, APHELINIDAE) PARASITIZING SIPHONINUS-PHILLYREAE (HOM, ALEYRODIDAE) IN CALIFORNIA

A laboratory study of preimaginal development, adult longevity and fec undity of Encarsia inaron (Walker) was conducted. Preimaginal developm ental times varied with temperature, from 55-60 d at 15 +/- 1 degrees C to 14-17 d at 30 +/- 1 degrees C. No development took place at 10 de grees C, which was approximately the developmental minimum estimated f rom regression analysis of developmental rates vs. temperature in the range 15-30 degrees C. Development was slowed and survival was reduced at 32 degrees C. Females lived an average of 18.6 days and laid an av erage of 159 eggs/female at 25 degrees C. At 25 degrees C, average pre imaginal survival was 59.3%, and the sex ratio was 73.5% female. The n et reproductive rate (R(0)) for E. inaron calculated from these studie s was 69.3, while the intrinsic rate of natural increase was 0.1686 in dividuals per individual per day. Oviposition was concentrated slightl y in third instar nymphs of the host.