부산대학교 도서관

Micromus timidus Hagen is one of the native natural enemies in Taiwan, and predator of many aphid species in both larval and adult stages. In this study, we documented the effect of prey types and temperatures on the development of M. timidus. Five species of aphids evaluated for establishing life history baseline information were, Aphis glycines Matsumura, A. nerii Boyer de Fonscolombe, A. gossypii Glover, Myzus persicae (Sulzer) and Lipaphis erysimi (Kaltenbach), respectively. None of the larvae fed with L. erysimi survived till 2nd instar. M. timidus fed with A. glycines, A. nerii and A. gossypii took about 12 days to complete their development from larval to adult stage. Survival rate of M. timidus in A. glycines and M. persicae treatments both were higher than 90%. There were no significant differences found between four prey types on M. timidus female reproductive traits. The average female longevity was between 60.5 to 71.8 days. The average fecundity ranged from 1130.3 to 1404.1 eggs per female. Offspring hatchability was between 62.7 to 80.5%. The relationship between development rate (D) and temperature (T) was shown in linear regression equation: D(T)=0.0039T−0.0373. The development periods of M. timidus fed with A. glycines from egg to adult were 50.6, 22.8, 15.7 and 13.0 days at 15, 20, 25 and 30℃, respectively. Survival rate was higher than 70% at both 20 and 25℃. The lower threshold temperature and effective accumulated temperature for M. timidus were 9.6℃ and 256.4 degree-day, respectively. Results showed that M. timidus has high reproductive and control potential in both larval and adult stages against several aphid species. For better mass rearing condition, choosing A. glycines and M. persicae as preys and temperature set up at 20-25 ℃ w ere recommended.