The Purdue Plant and Pest Diagnostic Laboratory

What's Hot on May 31, 2006
at the P&PDL!

Oak Leaf Blister

Gail Ruhl, Sr. Plant Disease Diagnostician, Department of Botany & Plant Pathology, Purdue University

Oak leaf blister, caused by the fungus Taphrina caerulescens, has recently been observed in Indiana on several different species of oaks . Infections occur as buds swell and open during wet, spring conditions. Leaf blister symptoms usually appear within several weeks following infection as 1/4-1/2 inch circular, light green bulges on the top surface of leaves. From the underside, the affected areas are sunken or depressed. These distortions may cause leaf bending or curling of narrow-leaved oak species. As the blisters age, they become dry, brown spots; severely diseased leaves may drop prematurely. This disease does not seriously harm healthy trees and control with fungicides is not usually recommended.

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Information listed is valid only for the state of Indiana


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Oak leaf blister

Oak leaf blister

Purdue Plant & Pest Diagnostic Lab Purdue Cooperative Extension Service