Abstract
The duration of the development of the aphelinidEncarsia tricolor Föerster (a parasitoid of the aleyrodidTrialeurodes vaporariorum (Westwood), adult size and number of mature oocytes at emergence were determined under constant and variable temperature regimes. Females developed successfully from 14 to 32°C, but a 100% of pupal mortality was observed at 34°C. Males developed successfully from 16 to 28°C and they developed faster than females. Female and male, egg to adult development at constant temperatures ranged from 51.1 (14°C) to 14.3 (28°C) days and from 32.6 (16°C) to 11.8 (28°C) days, respectively. Predictions of the rate of development at variable temperatures were more accurate when made from 2nd and 3rd degree polynomials than from linear regressions. The number of mature oocytes at emergence ranged from 0.1 (30°C) to 2.2 (20°C). FemaleE. tricolor attained the greatest size at 20–24°C. The comparison with literature data shows thatE. tricolor develops faster thanT. vaporariorum at temperatures above 15°C.
Résumé
Encarsia tricolor Foërster est un parasitoïd deTrialeurodes vaporariorum (Westwood) qui se trouve spontanément en cultures maraîchères tout au long du littoral méditerranéen. Les objectifs du présent travail furent la détermination de l'effet des températures constantes et variables sur la durée du développement, la tailles des adultes ♂ ♂ et ♀ ♀ d'E. tricolor et sur le nombre d'oocytes et d'ovarioles des ♀ ♀ juste après l'émergence. Les ♀ ♀ se développèrent avec succès aux températures comprises entre 14 et 32°C, mais à 34°C une mortalité totale au stade nymphe est observée. Les ♂ ♂ développèrent aussi avec succès aux températures comprises entre 16 et 28°C et leur développment fut plus rapide que celui des ♀ ♀ quelles que soient les températures utilisées. A température constante, la durée du développment de l'œuf à l'adulte des ♀ ♀ et des ♂ ♂ varie de 51,1 (14°C) à 14,3 (28°C) jours et de 32,6 (16°C) à 11,8 (28°C) jours, respectivement. Les prévisions de la durée du développment à températures variables furent plus exactes en utilisant les polynômes de 2e et 3e degré plutôt que les régressions linéaires. Le nombre d'oocytes mûrs à l'émergence varie de 0,1 (30°C) à 2,2 (20°C). Les ♀ ♀ d'E. tricolor atteignent leurs tailles maximales à 20–24°C. Compte-tenu des données de la littérature, on s'aperçoit queE. tricolor se développe plus vite queT. vaporariorum, quand les températures sont supérieures à 15°C.
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Avilla, J., Copland, M.J.W. Development rate, number of mature oocytes at emergence and adult size ofEncarsia tricolor at constant and variable temperatures. Entomophaga 33, 289–298 (1988). https://doi.org/10.1007/BF02372618
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DOI: https://doi.org/10.1007/BF02372618