| Optimal conditions for cold storage of Diachasmimorpha longicaudata (Ashmead) were studied in this paper. Results showed that the 12-day old D.longicaudata (at the stage of pupa) was the optimal stage for cold storage because it was less susceptive to the low temperature. Its emergence rate reached 94.67% when stored at 5℃ for 3 days, which was close to the control, 95.33%. Its emergence rate decreased to 70.00% when stored for 6 days, however which was quite higher than other treatments. The effect of cold storage on the population quality of 12-day old. D. longicaudatawas evaluated from the aspects of developmental duration, emergence rates, fecundity, sex ratio of the offspring, female longevity, and index of population trend ( I value), D. longicaudatapupae were stored at 2, 5, 8, 11 and 14℃ for periods of 3, 6, 9 and 12 days, separately. The optimal storage conditions forD.longicaudata pupa were to store at 8℃ for 3 d and 14℃ for less than 9 d, their I value were close or even a little higher than the control ones, 25.16. |
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