Submitted to: CDFA Pierce's Disease Control Program Research Symposium
Publication Type: Proceedings
Publication Acceptance Date: 11/28/2008
Publication Date: 12/15/2008
Citation: Leopold, R.A., Chen, W. 2008. Cold storage of Gonatocerus ashmeadi Girault (Hymenoptera: Mymaridae): Extended emergence, parental and progeny fitness. CDFA Pierce's Disease Control Program Research Symposium. p. 35-38.
Technical Abstract: The emergence pattern was changed after immature G. ashmeadi were stored within their Homalodisca vitripennis egg hosts under a fluctuating temperature and a short-day photoperiod for 30 d. The fitness of parasitoids collected from three emergence peaks coming 1-5, 12-16, and 23-26d after the onset of the first emergence was investigated by examining developmental and reproductive parameters. Likewise, these parameters were also determined for the F1 and F2 progeny. The development to adulthood of the parental parasitoids collected from 2nd and 3rd emergence peaks was delayed by approximately 106% and 279% while the parasitoids collected from 1st emergence period had no developmental delay. Compared to the control group, the parasitism of the egg hosts by parasitoids collected from the 1st, 2nd, and 3rd emergence periods was decreased by 43, 68 and 80%; the fecundity by 53, 84 and 89%; and the longevity by 27, 72 and 67%, respectively. The F1 parasitoids derived from parents collected from 2nd and 3rd emergence periods also had a lower incidence of parasitism. The fecundity and longevity of F1 and F2 parasitoids derived from parents collected from 2nd and 3rd emergence periods were significantly reduced. However, development and emergence of the F1, F2 and F3 parasitoids were not influenced by any of the periods from which their ancestors emerged.