Fall migration, hibernation site selection, and associated winter mortality of plum curculio (Coleoptera: Curculionidae) in a Quebec apple orchard
Lafleur, G.; Hill, SB.; Vincent, C.
Journal of Economic Entomology 806: 1152-1172
ISSN/ISBN: 0022-0493 DOI: 10.1093/jee/80.6.1152
In the autumms of 1981-83, >5000 labelled (with 65Zn) adults of Conotrachelus nenuphar were released in 2 apple orchards, 2 woodlots and 16 microplots in a ploughed field in Quebec. From orchards, most adults migrated towards high tree silhouettes at the edge of woodlots unless they occurred to the north. Most (83%) of those within woodlots, with no directional differences in tree silhouette, migrated south. Migration was influenced by woodlot type and direction. Where woodlots had a thin litter layer, the adults remained at the edge or returned to the orchard. In a field choice experiment, hibernating adults were recovered in thick litter (86%) and orchard turf (14%) plots, whereas none was found in gravel and thin litter layer plots.