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New Zealand Plant Protection 60 (2007): 21-25

Aestivation in apple leaf-curling midge (Diptera: Cecidomyiidae) parasitoid, Platygaster demades Walker (Hymenoptera: Platygastridae)

X.Z. He and Q. Wang

ABSTRACT

This study reports an investigation on the aestivation and overwintering strategies of Platygaster demades, an egg parasitoid of apple leaf-curling midge (ALCM), Dasineura mali, under natural conditions during 2005- 2006. The first three generations of ALCM developed into adults during the spring-autumn of 2005/2006 and the fourth generation overwintered as larvae. All first generation P. demades emerged in the spring of 2005. About 64% of live individuals of P. demades in the second generation and 38% in the third generation entered aestivation as eggs, which hatched in mid March and early May 2006, respectively. Parasitoid eggs of the fourth generation started to hatch four weeks after the parasitised ALCM larvae entered the soil. The aestivated and fourth generation parasitoids overwintered as immature stages and started emerging in late September 2006. The emergence patterns of overwintered parasitoids and ALCM were highly synchronized in the following season.

Keywords: Platygaster demades, Dasineura mali, aestivation, overwintering, emergence.

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