Abstract
The parasitoidChelonus sp. nearcurvimaculatus Cameron showed higher survival rates when reared on the pink bollworm,Pectinophora gossypiella (Saunders) than the potato tuberworm,Phthorimaea operculella (Zeller), demonstrating a developmental host preference for the former. Females reared for one generation on the source host,Pectinophora, demonstrated a higher reproductivity on another, the factitious host,Phthorimaea, than when reared for 30 generations on the latter. An additional expression of suitability ofPectinophora forChelonus sp. was a greater female progeny production. ConditioningChelonus sp. to attackPhthorimaea more effectively by rearing the parasitoid on that host failed, but succeeded by passage through the source host,Pectinophora. The importance of categorizing the degree of host specificity of different parasitoid species prior to mass rearing and field release is discussed.
Résumé
Le parasitoïdeChelonus sp. près decurvimaculatus,Cameron a montré des taux de survie plus élevés quand il est élevé surPectinophora gossypiella (Saunders) que surPhthorimaea operculella (Zeller), démontrant une préférence d'hôte pour le premier, dans lequel il se développe le mieux. Les femelles, élevées pendant une génération sur l'hôtePectinophora, ont fait preuve d'une reproduction plus importante sur un autre hôte, de substitution,Phthorimaea, que quand elles sont élevées pendant 30 générations sur ce dernier. Une autre expression de l'aptitude dePectinophora pourChelonus sp. est une plus grande production de descendants femelles. On n'a pas réussi à conditionnerChelonus sp. pour parasiterPhthorimaea plus efficacement en élevant le parasitoïde sur cet hôte, mais on a réussi par passage chez l'hôte d'originePectinophora. On discute l'importance de classer les espèces de parasitoïdes selon leur degré de spécifité pour l'hôte avant l'élevage en masse et la libération dans la nature.
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Research supported by appropriation of the State of California, Department of Food and Agriculture, Agreement No. 9114.
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Legner, E.F., Thompson, S.N. Effects of the parental host on host selection, reproductive potential, survival and fecundity of the egg-larval parasitoid,Chelonus sp. Nearcurvimaculatus, reared onPectinophora gossypiella andPhthorimaea operculella . Entomophaga 22, 75–84 (1977). https://doi.org/10.1007/BF02372992
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DOI: https://doi.org/10.1007/BF02372992