Preferences of Anoplophora glabripennis (Coleoptera: Cerambycidae) for four host plants in Japan: potential for switching host plants
摘要
Anoplophora glabripennis (Motschulsky) (Coleoptera: Cerambycidae) has recently become established in Japan, damaging several street tree species, including Cercidiphyllum japonicum Sieb. & Zucc. (Saxifragales: Cercidiphyllaceae), Ulmus parvifolia Jacq. (Urticales: Ulmaceae), Aesculus turbinata Blume (Sapindales: Sapindaceae), and Salix L. (Rosales: Salicaceae). We compared preferences for these four host plants among three different host-plant populations. From the results, the ability of this species to utilize multiple host plants without strong innate preferences, combined with incomplete yet significant success in host switching during adulthood, likely promotes its invasive spread in Japan. Females were not attracted to their host-plant odors. The Ulmus population showed no significant differences in odor, feeding, or oviposition preferences. Both sexes of the Cercidiphyllum population had low feeding preferences for Ulmus, but showed no innate preference for the host plants. The Salix population was not attracted to Salix odor among those of the four host plants, but they fed more on Salix branches and showed oviposition preferences for Salix. Larvae from the Salix and Cercidiphyllum populations survived similarly on an artificial diet containing Cercidiphyllum, though the latter were slightly larger. Females of the Salix population laid more eggs on Salix, even though larvae from the Salix population could grow on the diet containing Cercidiphyllum. Survival rates and body size declined on diets without host branches. Changing host plants during adulthood resulted in 50% mortality in 2 weeks: about half transitioned successfully and reproduced. These species characteristics may be advantageous for this species’ invasive spread, in addition to its wide range of host plants.