Effects of body size of Bactrocera dorsalis pupae on oviposition and offspring developmental preference of Pachycrepoideus vindemmiae

In order to understand whether the influence of host’s body size on the preferential oviposition of mother parasitoids and the performance of progeny parasitoids， the effects of Bactrocera dorsalis pupae on oviposition and development of Pachycrepoideus vindemmiae were studied in laboratory. The pupae of B. dorsalis were manipulated by starvation at third instar larval stages to obtain host pupae with wide variation in body size. The results showed that P. vindemmiae was preferred to lay more eggs host pupae with small size， however， more females of offsprings were produced from larger host pupae. The development time and longevity of female and male offsprings maintained constant regardless of host size. The results suggested that B. dorsalis could allocate its offspring number and sex ratio， so as to maximize its fitness， based on assessment of host pupa mass.