The critical field photoperiod inducing ovarian diapause in the cabbage whitefly, Aleyrodes proletella (Homoptera: Aleyrodidae) |
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Authors: | ANDREW J. ADAMS |
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Affiliation: | Department of Pure and Applied Biology, Imperial College at Silwood Park, Ashurst Lodge, Ascot, Berks. |
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Abstract: | ABSTRACT. The ovarian and fat body development of cabbage whitefly, Aleyrodes proletella L., has been determined from field samples taken during the transition from a summer to an overwintering population. Between mid and late September 1983, the state of ovarian development decreases as the proportion of diapausing females increases. This is accompanied by maximum fat body development. Diapausing females emerge from late August onwards, and the critical photoperiod, based upon known larval sensitivity and including civil twilight as part of the photophase, is LD 15.5:8.5h. This is in agreement with laboratory studies. The majority of overwintering females are mated. Very few males survive the autumn. |
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Keywords: | Aleyrodes proletella diapause photoperiod field studies ovary fat body |
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