Century Dictionary and Cyclopedia - n. One of certain mites of
the family Phytoptidæ, or gall-mites, which do not produce galls
properly speaking, but live in a rust-like substance which they
produce upon the leaves or fruit of certain plants. Many of
these rusts have been described by botanists as rust-fungi.
Phytoptus oleivorus is the rust-mite of the orange, which
produces the brownish discoloration often noticed on oranges.
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