Leaf Blister, Catkin Deformity (Taphrina aurea, T. johansonii)
From: Ostry, Michael E.; Wilson, Louis F.; McNabb, Harold S., Jr.; Moore, Lincoln M. 1988. A guide to insect, disease, and animal pests of poplars. Agric. Handb. 677. Washington, DC: U.S. Department of Agriculture. 118 p.
Importance- Leaf blister and catkin deformity occur infrequently and are usually of little importance. Infection of catkins may be important, however, in tree breeding programs where seed production is critical.
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Look For:
- Blisters on the surfaces of leaves.
- Yellow swellings on female catkins in spring.
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 Leaf blistersPhoto by USDA Forest Service Archives
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Biology- Spores are produced on the surface of blistered leaves. There is only one infection period each year. Infection is caused by overwintering spores being washed onto catkins and leaves in the spring.
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 Catkin deformityPhoto by USDA Forest Service - Rocky Mountain Region Archives
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Control:
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