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The invasive wood-boring beetleAnoplophora glabripennis(Motschulsky) (Coleoptera: Cerambycidae) poses a serious threat to deciduous trees in North America and Europe, where it has been introduced in solid wood packing material from China (Haacket al.1997; Krehan 2003). This beetle attacks and ultimately kills a wide variety of hardwood tree species (Nowaket al.2001; Lingafelter and Hoebeke 2002); it has infested urban shade trees in Canada (Canadian Food Inspection Agency 2004), the United States (Haack 2003), and Austria (Tomiczek 2003) and has damaged poplar (PopulusL.; Salicaceae) plantations in its native China (Luoet al.2003).

Anoplophora gbbriperznis (Motschulsky) (Coleoptera: Cerambycidae: Lamiini) is an invasive woodboring beetle with an unusually broad host range and a proven ability to increase its host range as it colonizes new areas and encounters new tree species. The beetle is native to eastern Asia and has become an invasive pest in North America and Europe, stimulating interest in delineating host and non-host tree species more clearly. When offered a choice among four species of living trees in a greenhouse, adult A. glabripennis fed more on golden-rain tree (Koelreuteria paniculata Laxmann) and river birch (Betub nigra L.) than on London planetree (Platanus x acerifolia (Aiton) Willdenow) or callery pear (Pyrus calleryana Decaisne). Oviposition rate was highest in golden-rain tree, but larval mortality was also high and larval growth was slowest in this tree species. Oviposition rate was lowest in callery pear, and larvae failed to survive in this tree species, whether they eclosed from eggs laid in the treg or were manually inserted into the trees. Adult beetles feeding on c&ery pear had a reduced longevity and females feeding only on callery pear failed to develop any eggs. The resistance of golden-rain tree against the larvae appears to operate primarily through the physical mechanism of abundant sap flow. The resistance of callery pear against both larvae and adults appears to operate through the chemical composition of the tree, which may include compounds that are toxic or which otherwise interfere with normal growth and development of the beetle. Unlike river birch or London planetree, both golden-rain tree and callery pear are present in the native range of A. glabripennis and may therefore have developed resistance to the beetle by virtue of exposure to attack during their evolutionary history.

Anoplophora glabripennis (Motschulsky) is an invasive wood-boring cerambycid beetle that kills hardwood trees. The host range of this species is unusually broad but is not well defined in the available literature and may include tree species that have not been reported as hosts because they have not previously been exposed to the beetle. We evaluated oviposition by A. glabripennis offered a choice of four common eastern North American forest and landscape hardwood tree species, and performance of the resulting larvae, under greenhouse conditions. Significantly greater numbers of oviposition sites were found on sugar maple, Acer saccharum Marshall, than on red maple, Acer rubrum L., green ash, Fraxinus pennsylvanica Marshall, or red oak, Quercus rubra L., with no significant differences among the other three tree species. Similarly, significantly greater numbers of living larvae were found in sugar maple than in the other tree species; however, more were found in red oak and fewer in green ash than expected, considering relative numbers of oviposition sites. After 90 d, mean mass of living larvae did not differ significantly among tree species. These results suggest that all four tree species may be suitable hosts for A. glabripennis. Most importantly, although larval establishment was poor in green ash and larval growth may have been retarded in red oak, larvae did survive and grow in both species. We recommend that these tree species be considered potential hosts when surveys are conducted to detect infested trees or when replanting infested areas.