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Apple rust mite

Aculus schlechtendali (Nalepa)
Acari: Eriophyidae

The vermiform adult has two pairs of legs at the front of its body (A). Brownish yellow in color, they are invisible to the naked eye, requiring a minimum magnification of 15X to be observed.

Distribution

Most fruit-growing states and provinces in eastern North America.

Damage

Attacks apple mainly. Yellowish brown leaf discoloration occurs under very populated conditions (hundreds per leaf), sometimes accompanied by silvery-white blotches (B). Browning of the lower surface and drying out of the leaves occur as well (C; healthy foliage on left; damaged leaves, right). May occasionally russet fruit.

Management

Preserve mite predators. Monitor populations on leaves during the summer with a 15X magnifying glass. Miticides can be used if populations are very high (greater than 200–500 per leaf), but lower numbers are valuable as prey for predator mites.

Pest and Beneficials Search (search again)

The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the AgBioResearch, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.