Abstract
Gelis tenellus is among the top 3 most abundant hyperparasites of Apanteles melanoscelus (Ratzburg). Inexperienced females do not discriminate between parasitized and unparasitized host coccons. Mock cocoons treated with a hexane extract of the host cocoons were probed more than untreated mock cocoons suggesting the existence of a kairomone that stimulates ovipositional activity.

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