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Studies on the diapause of the apple leaf miner phyllonorycter ringoniella matsumura lepidoptera gracillariidae iv. variations in the photoperiodic responses upon the induction of diapause among generations



Studies on the diapause of the apple leaf miner phyllonorycter ringoniella matsumura lepidoptera gracillariidae iv. variations in the photoperiodic responses upon the induction of diapause among generations



Japanese Journal of Applied Entomology and Zoology 31(4): 375-380



Most of the 2nd and 3rd generations of the Morioka population of the apple leaf miner developed to diapausing pupae under the photoperiodic regime of 13 h or less at 15.degree. C and 20.degree. C. In the 1st generation, however, the percentage of diapause was about 50% or lower under the same photoperiodic-thermal conditions. In two hybrids between the overwintered (O) and the 1st (I) generations, the photoperiod-% diapause curve in the progeny of O .female. .times. I .male. closely resembled that of the lst generation. On the other hand, the curve in the reverse crossing (I .female. .times. O .male.) was similar to that of the 2nd generation. From these results, it was suggested that the information for the inhibition of the induction of the diapause acquired within the body of the overwintering female during the course of her development, was transmitted maternally in the 1st generation eggs. As the information disappeared after the 2nd generation, it is considered that the information did not affect the genetic sensibility for photoperiod, but was a secondary and temporary factor. The small differences observed between the 2nd and the 3rd generations, can be mainly ascribed to differences in the leaf age or number of instars during the sap-feeding larval stage. The decline of the photoperiodic responses in the 1st generation was also observed to some extent in all the other local populations examined; Asahikawa, Kanazawa, Suzaka, Hamamatsu and Amagi.

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Accession: 006515461

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