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Globular, warty galls of the trunk of an elm tree caused by feeding of an aphid,
Eriosoma
sp.
Globular, warty galls of the trunk of an elm tree caused by feeding of an aphid,
Eriosoma
sp. Credit: Jack Kelly Clark
Globular, warty galls of the trunk of an elm tree caused by feeding of an aphid, Eriosoma sp. Credit: Jack Kelly Clark
