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Influence of breeding conditions on longevity and fecundity ofRaphitelus maculatus [Hym.: Pteromalidae] reared under standard laboratory conditions

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Abstract

The rearing ofRaphitelus maculatus Walker, which oviposits through the bark onto beetle larvae has been carry out under standard laboratory conditions of 22 ± 2°C, 60% R.H. and photoperiod 16L∶8D. The host (Phloeotribus scarabaeoides Bernard) has been reared by cutting fresh branches of living olive tree on which they overwinter as adults. The effect of several rearing conditions (feeding conditions) on longevity and fecundity has been tested. The time of parasitoid and host development as well as the periods of emergence from the infested cut branches has been determined. It has been noted that both longevity and fecundity are influenced by the feeding conditions, reaching toca. double value when parasitoids were fully fed. Under standard rearing conditionsR. maculatus completes its life cycle in 17–18 days depending on sex, whereasP. scarabaeoides takes about 48 days. Finally 3 emergence periods has been observed from which the 1st is the most important and the 3rd is always the less significantly one, provided that the emerging brood cannot oviposits easier than the parents due to a decrease on host larvae proportion as well as on parasitoid fecundity.

Résumé

Raphitelus maculatus Walker est un parasitoide fréquemment associé au scolyte de l'olivier,Phloeotribus scarabaeoides Bernard, qui hiverne dans les branches de l'olivier (Olea europea L.). Dans les conditions contrôlées de laboratoire (22 ± 2°C, 60% H.R. et photopériode 16L∶8.0.),R. maculatus complète son cycle larvaire en 17 jours environ, tandisqueP. scarabaeoides effectue son développement en 48 jours.

On a étudié l'effet des conditions d'élevage sur la longévité des adultes et sur la fécondité des femelles et on a observé qu'elles sont très sensibles aux conditions alimentaires. La longévité varie selon la disponibilité en eau et en nourriture entre 2.65 et 14.95 jours chez les ♂♂, entre 5.04 et 15.57 jours chez les ♀♀.

La fécondité (nombre moyen d'œufs déposés) varie entre 18.2/♀♀ sans nourriture et 44.5/♀♀ alimentée.

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Authors and Affiliations

  1. Department of Phytopatology Experimental Station of Zaidin, C.S.I.C., Prof. Albareda 1, E-18008, Granada, Spain

    M. Campos & R. Gonzalez

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  1. M. Campos
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  2. R. Gonzalez
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Campos, M., Gonzalez, R. Influence of breeding conditions on longevity and fecundity ofRaphitelus maculatus [Hym.: Pteromalidae] reared under standard laboratory conditions. Entomophaga 35, 411–420 (1990). https://doi.org/10.1007/BF02375265

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  • DOI: https://doi.org/10.1007/BF02375265

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