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Eriophyid Mites

Adult eriophyid mites are very small (<1mm). They are spindle-shaped, with four legs and may be white, yellow or orange.  There are several generations a year and overwinter in bark crevices and under bud scales. Some species feed on the leaf surfaces of both deciduous and needled evergreen trees causing the foliage to turn olive-tan.  Plants with a history of eriophyid mite damage should receive a dormant oil spray to kill overwintering stages.  Leaf feeding mites can be controlled with a spray of horticultural oil whenever they reach damaging levels.