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Rust Mites

Rust mites

Hosts:  apple, pear


Biology:
  Rust mites are microscopic mites in the eriophyid group.  Adults overwinter under leaf bud scales of pear and apple, and emerge with new leaf growth in the spring. 


Symptoms:
  Russeted fruit; pear leaves are sensitive to rust mites, becoming bronzed or scorched. 


Monitoring:
  Use a hand lens to inspect leaves starting in mid-spring.


Treatment Threshold:
  No threshold determined.


Degree Day Model:
  None


Management Considerations:
  In apple, rust mites can be beneficial in that they may serve as alternative prey for predatory mites that also help suppress spider mites.  In pear, lower populations can be tolerated.