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The P&PDL Picture of the Week
for 2 December 2002

Linden Mites

Carrie Lapaire, Department of Botany and Plant Pathology, Purdue University

This little leaf linden (Tilia cordata) branch has been attacked by a mite. The erineum galls you see at the nodes were most likely caused by Eriophyes tilae, a type of eriophyid mite. Eriophyid mites are host specific, meaning that each type of mite attacks only one type of plant. E. tilae is similar to the mite that causes galls on many other trees, including beech, elm, and maple. Generally, these mites overwinter as adults in the buds or under the bark. They can distort leaves and twigs. Aside from the visible deformation eriophyid mites rarely do serious harm to plants in the environment, and treatment is unnecessary.

For more information, please refer to the following web pages:
University of Vermont Extension - http://ctr.uvm.edu/ctr/el/el144.htm
Colorado State University - http://www.kaweahoaks.com/html/galls_article02.html

Click on the small image to view a larger image.

Swollen buds and galls are common symptoms of mite infestation, as shown
here on littleleaf linden stems

Photos courtesy of Carrie Lapaire

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Last updated: 9 December 2002/jrm
The Plant & Pest Diagnostic Laboratory at Purdue University