Study On Introductive Factors Of Diapause And Post-diapause Development Of Carposina Sasakii On Different Hosts

Peach fruit moth, Carposina sasakii Matsumura is a important fruit pest of many fruits, it occurs differently on different fruit tree.Overwintering larvacs of apple, haw, and apricot's were laid under samely circumstance to observe their coming up out of land rules.Overwintering pupa and the first generation egg's base temperature for development andeffective thermal summation of three kinds of Carposina sasakii Matsumura are measured with constant temperature method. Carposina sasakii Matsumura of apple (as control), haw and apricot were reared on apple,and their diapause responses are measured at different light treatment.The result diapause responses of are as follows:Under samely temperature and moist circumstanc, Carposina sasakii Matsumura of apricot corned out of land most earlist and 10 days earlier than than of apple's, Carposina sasakii Matsumura of haw corned out of land most latest and 8 days later than that of apple. The peak differences are 16 and 12 days.The results of base temperature for development and effective thermal summation of post-diapaused pupas and the first generation eggs are as follows:.pupas post-diapaused: Population of haw's are 8.85℃ and 197.74℃/D,while apricot 's as 6.07 ℃ and 218.94℃/D,and apple's as 8.76℃ and 189.48℃/DoThe first generation eggs: Population of haw's are 8.57℃ and 86.12℃/D,yet apricot's as 7.59℃ and 92.64℃/D and apple's as 8.17℃ and 88.65℃/D<, Conclusions can be drawn from the results above.(1) The time of coming out of land of Carposina sasakii Matsumura on different host, base temperature for development and effective thermal summation of different forms after diapause are different. That makes for their different taking place time in the field and larvas's taking place time synchronize highly with the host fruit grow time.(2) Carposina sasakii Matsumura of apricot was effected little by photoperiod and it has been diapuse. Dipause characteristic and it's early taking place time are all adapted to short growing time and early taking place of fruit.(3) Carposina sasakii Matsumura of haw Was effected by photopenriod, but postpone of post-diapause growth maked larla's entering time has been extended photopenriod. This wasIradapted to long growing time and late taking place of fruit.(4) Divergence of time of coming out of land of Carposina sasakii Matsumura on different host, diapause, base temperature for development and effective thermal summation of different kinds of Carposina sasakii Matsumura are adaptation to their own host's phenology and that make function in macth time quarantine, when populations are in divergence.