How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Pear rust mites

Pear rust mites are very small -- only about 0.2 mm long, so you need at least a 14X lens to see them. Pear rust mite is often not detected until after damage had occurred. The russetting on the fruit becomes visible around late May or June, when pears have increased in size and turned down. On occasion, late-season populations of pear rust mites may be present but feeding only on tender foliage.

Don't confuse rust mites with spider mites, which are rounder and larger, usually have two spots, and often produce webbing. Predatory mites are clear and move rapidly.

Inspect with a hand lens for mites
Inspect with a hand lens for mites
Webbing of leaves
Webbing of leaves
Spider mite
Spider mite

Statewide IPM Program, Agriculture and Natural Resources, University of California
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