Canadian Forest Service Publications

Host preferences of the gypsy moth, Lymantria dispar (L.), in southern Quebec. 1983. Mauffette, Y.; Lechowicz, M.J.; Jobin, L.J. Canadian Journal of Forest Research 13: 53-60.

Year: 1983

Available from: Laurentian Forestry Centre

Catalog ID: 14789

Language: English

CFS Availability: PDF (request by e-mail)

Abstract

Larval populations of gypsy moth were monitored from June through July 1980 in southwestern Quebec, the northern edge of the insect's North American range. Larval activity on a total of 1870 trees representing 29 tree species was studied at 13 different sites. At least some gypsy moth larvae were found on all tree species, but different larval preferences for the available host trees were evident. Gypsy moth larvae preferentially attacked Quercus rubra L., Amelanchier spp., Populus grandidentata Michx., Salix sp., and Ostrya virginiana (Mill) K. Koch. The larvae generally avoided members of the genus Fraxinus, Acer negundo L.; A. pensylvanicum L., A. rubrum L., A. saccharinum L., Betula lutea Michx. f., Carya cordiformis (Wang) K. Koch, C. ovata (Mill) K. Koch., Juglans cinerera L., Pinus strobus L., Populus deltoides Marsh., Prunus pensylvanica L.f., Purus malus L., and Ulmus rubra Muhl. The following species are best categorized as intermediate hosts whose utilization varies with forest composition; Acer saccharum Marsh., Betula papyrifera Marsh., B. populifolia Marsh., Fagus grandifolia Ehrh., Populus tremuloides Michx., Prunus serotina Ehrh., Tilia americana L., and Ulmus americana L. Some differences were found from host preferences reported for New England. For example, Ostrya virginiana is strongly preferred in Quebec in contrast to New England where it is only an intermediate host; Betula populifolia and Populus tremuloides are both preferred in New England by classed as intermediate hosts in our study. Overall, the forest composition appears to play only a limited role in altering gypsy moth host selection, but does especially affect the utilization of intermediate hosts.

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