Host preference and galling success in closely related aphids, Tetraneura yezoensis and T. radicicola (Pemphigidae: Aphidoidea), associated with the Japanese elm

概要

論文の詳細を見る
Factors determining the density of aphid galls on individual host trees were examined in two closely related aphid species, Tetraneura yezoensis and T. radicicola, sharing the same primary host, Ulmus davidiana var. japonica. Gall density on a host tree is mainly determined at two stages of the life cycle: 1) host selection by autumnal migrants that fly from the secondary host, and 2) gall formation by nymphs the next spring. The density of autumnal migrants landing on each host tree and the galling success on the trees were determined, and relative gall density was predicted by multiplying the two factors. In both species, the regression of observed gall density on predicted density was highly significant. However, the main factor affecting gall density varied between the two species. In T. radicicola, host preference of migrants was mainly responsible for inter-tree variation in gall density. Migrants of this species avoided some trees on which the galling generation could have successfully induced galls. In T. yezoensis, gall density was mainly determined by inter-tree differences in galling success. The difference between the two species in host adaptation probably results from their historical relationships with U. davidiana.
日本応用動物昆虫学会の論文
1999-02-25