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White Oak Leaf Blister: Cosmetic Fungus, No Spray Needed

Pale green/brown convex leaf spots on Maryland white oak = oak leaf blister (Taphrina deformans). Spring-only fungus. Severe cases cause early drop, but established trees survive fine.

Cultural Care

Rake/destroy fallen leaves.
On small/specimen trees: protectant fungicide (Bordeaux, chlorothalonil) at bud swell next spring.

Chemical control rarely warranted for large trees.

Trees: Oak Leaf Galls in Scotland: Harmless Wasp-Induced Growths; Oak Leaf Blister: Harmless Fungal Spots on White Oak; White Oak Leaf Galls: Wool Sower Gall Identification; Swamp White Oak Twig Drop: Twig Girdler/Pruner Beetles; Oak Galls: Species-Specific, Not a Health Threat; Oak Galls: The Strange Green Ball with Purple Hairs; Diagnosing and Managing Oak Wilt; Oak Wilt in Fredericksburg, Texas: Prevention Is the Only Cure; Oak Bacterial Leaf Scorch: A Fatal Disease with No Cure; Oak Leaf Blister: Rake Leaves, Tree Will Recover

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