Alder erineum mite

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Acalitus brevitarsus is an eriophyid mite which induces domed, blister like swellings, known as galls, on some species of alder (Alnus species). Description of the gall A pale, slightly domed swelling on the upper surface, which is induced by mites living and feeding within erineum (hairs), on the lower surface. The hairs are white or yellowish at first, later rust-brown and when viewed with a hand lens, the erineum look like a mat of shiny, glass-like hairs.

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