Rusty citrus fruit may be infestation of mites
Tallahassee.com
Citrus grown in the home landscape can be attacked by a number of insect and mite pests. Some of these pests are large enough to be spotted early in their infestation; others are so small that you can't see them without magnification. ...
Rusty looking citrus fruit might mean an infestation of citrus rust mitesGulf Breeze News

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