Effect of cold storage on the population quality of Tetrastichus brontispae
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Key Words：Brontispa longissima, Tetrastichus brontispae, cold storage, population quality
Abstract：The present paper investigated the effect of cold storage of the Brontispa longissima (Gestro) pupae and parasitized B.longissima pupae on the population quality of Tetrastichus brontispae Ferriere.The 1～4 days old B.longissima pupae were stored at 10℃ for 10 days. Results showed that the highest parasitisation rate, highest emergence rates of per mummy, highest emergence rate,highest number of wasps per mummy and highest parasitic ability was found in 1 day old pupae,which was followed by that in 2～3 days pupae,while the lowest in 4 days old pupae. The 1 day old pupae biological qualities decreased as the period of cold storage increased from 5 days to 20 days,while the pupae cold storage 5 days and 10 days had no differences compared with the control.The mummies were stored at 10℃ for 10 days after they were formed 1～11 days. Results showed the longest adult life,highest highest emergence rates of per mummy,highest number of wasps per mummy and highest parasitic ability was found in 8 days mummies.The 8 days mummies biological qualities decreased significantly compared with the control as the period of cold storage increased from 5 days to 20 days.