Eriophyes cerasicrumena

Eriophyes cerasicrumena, the black cherry leaf gall mite, is a species of gall mite in the family Eriophyidae. This species was formerly a member of the genus Phytoptus. They produce galls on black cherry plants. Caterpillars of cherry gall azure feed on these galls, and apparently also on the mites themselves.