The larval gypsy moth parasite,Parasetigena silvestris, deposits a greater number of eggs on larvae tethered to red oaks compared to those tethered to white pine. Parasite response to gypsy moth host plant is not based on the density of larvae on oaks. Factors associated with pine bark do not provide conditions which reduceP. silvestrisoviposition. Experiments on the role of other specific components of the host's habitat did not provide any evidence of the factors affecting host-habitat selection byP. silvestris.