Evolution de la diapause du psylle du poirier Cacopsylla pyri dans les conditions naturelles

Lyoussoufi, A.; Gadenne, C.; Rieux, R.; D'arcier, F Faivre

Evolution de la diapause du psylle du poirier Cacopsylla pyri dans les conditions naturelles

1994

Lyoussoufi, A. | Gadenne, C. | Rieux, R. | D'arcier, F Faivre

SUMMARY: Diapause development of the pear psylla, Caco-psylla pyri (L.) under natural conditions In the Avignon area, the winter-form of the pear psylla, Cacopsylla pyri (L.), appears during the first 10 days of September. Adults continue to emerge throughout the winter until January and even later. The sex-ratio is at first high, stabilizes at about 1 and then decreases in mid-January with the precocious mortality of males. Throughout winter, immature ovaries of winter-form females undergo a slow but constant development. Diapause does not prolong any particular ovarian stage and its completion seems to occur at any stage. The mating process is not strictly linked with the completion of diapause of winter-form females. However, the latter do not mate with males of the summer-form which are still present in autumn.

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