Abstract
(1) The response of a parasitoid species to host density was investigated for a host species concealed by plant tissues. The parasitoid was Pteromalus sp. and the host was a stem-galling sawfly, Euura lasiolepis on the willow, Salix lasiolepis. (2) For three consecutive years in natural populations the parasitoid responded in an inversely density-dependent manner to host density, as density varied among patches of hosts on willow clones.
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