(Eriophyes sp.)

Order: Acari (AK-ar-ee) (Info)
Family: Eriophyidae (er-ee-oh-FY-id-ee) (Info)
Genus: Eriophyes (er-ee-oh-FY-ees) (Info)
Species: sp.

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On Nov 10, 2009, Zaragoza from Zaragoza
Spain (Zone 8b) wrote:

Various species of Eriophyes makes big galls in the branches of willows (Salix spp.) These galls can be unpleasant to see esthetically, but they're not dangerous for the tree.