Abstract
Two geometrid larvae, Erannis golda Djakonov and Wilemania nitobei (Nitobe) were observed to feed on the bud galls formed by the gall-mite Eriophyes sp. (Acarina, Eriophyidae) on a Carpinus tschonoskii tree. These larvae heavily grazed the galls externally and preferred the galls to young leaves of C. tschonoskii. The adaptive significance of this gall-feeding habit was discussed.
