Abstract
The behavioral responses of Brachymeria intermedia (Nees), B. lasus (Walker), and B . sp. (Hymenoptera: Chalcididae) to humidity and temperature gradients were measured and compared to that of other gypsy moth, Lymantria dispar (L.) (Lepidoptera: Lymantriidae), parasitoids; namely, Apanteles melanoscelus (Ratzeburg) and A . sp. (Hymenoptera: Braconidae), Eurytoma verticillata (F.) (Hymenoptera: Eurytomidae), Gelis tenellus (Say) (Hymenoptera: Ichneumonidae), and Compsilura concinnata (Meigen) (Diptera: Tachinidae). Brachymeria spp. preferred lower humidities and higher temperatures than the other parasitoids but did not differ noticeably from each other. As the established species, B. intermedia . is found primarily in sunny habitats, it is likely that B. lasus and B . sp., which are exotic species not yet released in North America, have the same habitat preferences. This has implications for their effectiveness as gypsy moth parasitoids.
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