Anabelle O. Dasilao
Laboratory of Applied Entomology, Faculty of Agriculture, Kochi University;
B 200, Mono be, Nankoku, Kochi, 783-8502, Japan
Ryo Arakawa
Laboratory of Applied Entomology, Faculty of Agriculture, Kochi University;
B 200, Mono be, Nankoku, Kochi, 783-8502, Japan
ABSTRACT
The scelionid parasitoid Gryon philippinense (Ashmead) is a solitary egg parasitoid of the winter cherry bug, Acanthocoris sordidus Thunberg. The thermal effect on the development of G. philippinense and A. sordidus eggs and the host-age preference of G. philippinense were investigated. G. philippinense and A. sordidus eggs were reared under conditions of 15.0, 20.0, 22.5, 25.0, 27.5 and 30.0°C with LD 16:8. The development of G. philippinense and A. sordidus eggs was inhibited at 15.0 and 17.5°C, respectively. As the temperature increased from 20.0°C, the emergence rate of G. philippinense increased. The developmental period of G. philippinense and of A. sordidus eggs decreased with the increase of temperature. Both the lower threshold temperature and the effective cumulative temperature of G. philippinense were higher than those of A. sordidus eggs. Suitable rearing temperature for G. philippinense is supposed to be between 22.5 and 30.0°C. When 0-14-day-old host eggs were supplied to G. philippinense, hosts 0-2-day-old were all accepted. The emergence rate was higher in younger host eggs than in older ones. The developmental period of G. philippinense varied among host eggs of different ages. Host-age had no obvious effect on the body size of the G. philippinense male. In the G. philippinense female, the body size decreased with increasing host-age. The younger host eggs were supposed to be suitable for mass rearing of G. philippinense.
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How to cite this article
Anabelle O. Dasilao and Ryo Arakawa, 2005. Development and Host-age Preference of Gryon philippinense (Hymenoptera: Scelionidae), a Solitary Egg Parasitoid of the Winter Cherry Bug Acanthocoris sordidus (Hemiptera: Coreidae). Pakistan Journal of Biological Sciences, 8: 34-39.
DOI: 10.3923/pjbs.2005.34.39
URL: https://scialert.net/abstract/?doi=pjbs.2005.34.39
DOI: 10.3923/pjbs.2005.34.39
URL: https://scialert.net/abstract/?doi=pjbs.2005.34.39