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Bead galls on leaves and felty, white growth (erineum) on a stem, abnormal plant growths caused by feeding of willow blister gall mite, Vasates laevigatae.

Bead galls on willow, from willow leaf blister mite and white twig encrustation from erineum mite. Davis by JKC. Credit: Jack Kelly Clark — Credit: Jack Kelly Clark

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