Abstract
Paralobesia viteana (Clemens) (Lepidoptera: Olethreutidae) was reared on various varieties of grapes purchased on the fresh-fruit market or locally grown. The insect was reared continuously through 41 generations, with each generation requiring about 28 days at 25.5± 1.7°C and 16 hours of light per day. Under these conditions larvae did not diapause. Although the reproductive rate varied considerably from generation to generation a 4-fold population increase was commonly obtained. After 33 generations the productivity of the colony declined and although the rate improved in the 35th and 36th, later generations contained dominantly female moths. The progeny from females of the 41st generation mated with wild males were all females. While the method described permits large-scale rearing of the grape berry moth, it appears that continuous inbreeding eventually reduces the viability of the colony and requires new field material after some 30 generations.
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