Abstract
The synchrony of the citrus blackfly (CBF)Aleurocanthus woglumi Ashby and its parasitoidAmitus hesperidum Silvestri was studied in southern Florida.A. hesperidum adults emerge from 4th instar nymphs 160–300 thermal units after CBF adults. This insured excellent temporal synchronization between the parasitoids and the early CBF instars they prefer since egg to 3rd instar nymph in CBF takes 380 thermal units. AlthoughA. hesperidum parasitized only 29% of the surviving 4th instar CBF, it was the factor responsible for the observed decline in the CBF population level in southern Florida.
Résumé
La coïncidence de la mouche noire des citrus,Aleurocanthus woglumi Ashby et de son parasitoïde,Amitus hesperidum Silvestri a été étudiée en Floride mérioionale. Les imagos deA. hesperidum sortent des larves du 4e stade de l’aleurode quand il y a eu 160 à 300 unités thermiques après la sortie des aleurodes adultes. Ce phénomène assure une excellente coïncidence temporelle entre les parasitoïdes et les premiers stades de l’aleurode, qu’ils préfèrent, puisque le développement depuis l’œuf jusqu’au 3e stade de l’aleurode demande 380 unités thermiques. Bien qu’A. hesperidum parasite seulement 29% des aleurodes du 4e stade survivant, il a constitué le facteur responsable de la réduction du niveau de population de l’aleurode observé en Floride méridionale.
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Florida Agricultural Experiment Station Journal Series No. 1167.
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Dowell, R.V. Synchrony and impact ofAmitus hesperidum [Hym.: Platygasteridae] on its host,Aleurocanthus woglumi [Hym.: Aleyrodidae] in southern Florida. Entomophaga 24, 221–227 (1979). https://doi.org/10.1007/BF02374235
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DOI: https://doi.org/10.1007/BF02374235