Host Switching in Brachymeria intermedia (Hymenoptera: Chalcididae), a Pupal Endoparasitoid of Lymantria dispar (Lepidoptera: Lymantriidae)
- 1 August 1992
- journal article
- research article
- Published by Oxford University Press (OUP) in Environmental Entomology
- Vol. 21 (4) , 760-766
- https://doi.org/10.1093/ee/21.4.760
Abstract
Brachymeria intermedia (Nees) was reared on its most prevalent host, Lymantria dispar L., and on Holomelina lamae (Freeman), not a natural host of B. intermedia. Host acceptance levels for L. dispar were much higher than for H. lamae. Rearing on H.lamae or adult experience with pupae of this species did not elevate its acceptability. When B. intermedia were deprived of hosts from emergence, the acceptance levels for L. dispar and H. lamae increased with age of the parasitoid, although more so for L. dispar. In single-choice tests, H. lamae pupae contaminated with kairomone of L. dispar were accepted at the same rate as L. dispar pupae. Experience with the contaminated H. lamae pupae increased the acceptance levels for clean H. lamae. The degree of polyphagy of B. intermedia is discussed.Keywords
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