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A hyperparasite of coccids develops as a primary parasite of fly puparia

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Abstract

Species ofPachyneuron (Hym.: Pteromalidae) have been recorded as either primary parasites or hyperparasites.P. concolor (Foerster) is a polyphagous secondary parasite, attacking encyrtid primary parasites in soft scales, mealy bugs and coccinellid larvae. It also develops as a tertiary parasite.

We now report thatP. concolor may also develop as a primary parasite of aphidophagous fly puparia. Host selection in this species appears to be based on locating a soft-bodied host within a hard, dry shell, independent of whether the host is a dipterous pupa in its puparium or a primary parasite in its mummified host.

The overall effect ofP. concolor is detrimental. Its introduction into new areas should definitely be avoided.

Résumé

Des espèces dePachyneuron (Hym.: Pteromalidae) ont été signalées être des parasites primaires ou des hyperparasites.P. concolor (Foerster) est un parasite secondaire polyphage attaquant les encyrtides parasites primaires des cochenilles et des larves de coccinelles. Il peut également se développer en parasite tertiaire. On indique ici queP. concolor peut aussi vivre en parasite primaire de pupes de diptères aphidiphages. Le choix de l'hôte par cette espèce apparaît déterminé par la localisation d'un hôte au corps mou dans une enveloppe dure et sèche, indépendamment du fait que cet hôte soit une nymphe de diptère dans son puparium ou d'un parasite primaire dans son hôte momifié.

L'action globale deP. concolor est nuisible. L'introduction de ce parasite dans de nouvelles régions est en définitive à éviter.

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Rosen, D., Kfir, R. A hyperparasite of coccids develops as a primary parasite of fly puparia. Entomophaga 28, 83–87 (1983). https://doi.org/10.1007/BF02372100

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