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The P&PDL Picture of the Week

Hedgehog Galls

Peggy Sellers, Purdue University

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Hedgehog Galls on While Oak
(Photos by Peggy Sellers)

These cool looking structures are galls that appear on white oaks as spheres that are covered with spines. Inside small cynipid wasps are developing. The galls can range from 1/4 to 1/2 inch in diameter and are often a yellow to red color. These galls, like many other galls on leaves of oaks, they cause no significant harm to the tree. Therefore, no controls are recommended.

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Last updated: 3 August 2001/tlm.
The Plant & Pest Diagnostic Laboratory at Purdue University.