Effects of photoperiod and temperature on diapause induction in the codling moth Cydia pomonella (L.) (Lepidoptera: Olethreutidae)
In order to explore the effects of photoperiod and temperature on the diapause induction in codling moth,the interactive effects of temperature (20,25 and 30 ℃) and photoperiod (L 16 ∶ D 8,L 14 ∶ D 10,L 12 ∶ D 12,L 10 ∶ D 14 and L 8 ∶ D 16) on diapause induction in this moth were investigated by artificial induction method.The results showed that when day length was less than 12 h,the rate of diapause reached to 100％ at 20 ℃.At 25 ℃,the highest rate of diapause was 98.3％ under the photoperiod of L 8 ∶ D 16.When day length was less than 10 h,the rate of diapause was more than 85％.The critical day length was 14.21,13.68 and 13.73 h at 20,25 and 30 ℃,respectively.The codling moth had two sensitive stages to photoperiod at 25 ℃,one was the 1 st instar larvae,and the other was the prepupal period.The egg was insensitive to photoperiod.The results indicated that the codling moth was a typical short-day diapause type.The photoperiod played the key role in diapause induction,followed by temperature and their interaction,and low temperature could promote the diapause induction.
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万方数据
维普
