Abstract
A laboratory study of preimaginal development, adult longevity and fecundity ofEncarsia inaron (Walker) was conducted. Preimaginal developmental times varied with temperature, from 55–60 d at 15±1°C to 14–17 d at 30±1°C. No development took place at 10°C, which was approximately the developmental minimum estimated from regression analysis of developmental rates vs. temperature in the range 15–30°C. Development was slowed and survival was reduced at 32°C. Females lived an average of 18.6 days and laid a average of 159 eggs/female at 25°C. At 25°C, average preimaginal survival was 59.3%, and the sex ratio was 73.5% female. The net reproductive rate (R0) forE. inaron calculated from these studies was 69.3, while the intrinsic rate of natural increase was 0.1686 individuals per individual per day. Oviposition was concentrated slightly in third instar nymphs of the host.
Résumé
Une étude a été menée en laboratoire sur le développement préimaginal, la longévité et la fécondité des adultes d'Encarsia inaron (Walker). La durée de développement préimaginal varie avec la température, entre 55 à 60 jours à 15±1°C et 14 à 17 jours à 30±1°C. Il n'y a pas de développement à 10°C, température qui correspond approximativement au seuil estimé à partir de la droite de régression de la vitesse de développement par rapport à la température dans l'intervalle 15–30°C. Le développement est ralenti et la survie réduite à 32°C. En moyenne, les femelles vivent 18,6 jours et pondent 159 œufs à 25°C. A cette même température, la survie préimaginale est en moyenne de 59,3% et la sex-ratio de 73,5% de femelles. Le taux net de reproduction R0 deE. inaron calculé à partir de ces études est de 69,3%, alors que le taux intrinsèque d'accroissement naturel est de 0,169 individus par individu et par jour. En ce qui concerne l'oviposition, une légère préférence est montrée pour le 3e stade larvaire de l'hôte.
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Gould, J.R., Bellows, T.S. & Paine, T.R. Preimaginal development, adult longevity and fecundity ofEncarsia inaron (Hym.: Aphelinidae) parasitizingSiphoninus phillyreae (Hom.: Aleyrodidae) in California. Entomophaga 40, 55–68 (1995). https://doi.org/10.1007/BF02372681
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DOI: https://doi.org/10.1007/BF02372681