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Birch Leaf Corrugation from Witchhazel Gall Aphids: Cosmetic, Treatable

Birch leaves puckered like potato chips are galled by witchhazel gall aphids. Winged aphids move from witchhazel to birch, inducing corrugated galls. Mostly cosmetic. Spray birch leaves with insecticide at spring leaf-out, or apply imidacloprid (systemic) in March. May need fall repeat.

About Gardening: Black Sooty Mold on Hackberry: Controlling the Aphids and Scale Behind It; Diagnosing Bark Peeling and Leaf Loss in Birch Trees; Hydrangea Tree Yellowing and Leaf Drop: Water Stress, Not Spray Damage; Dwarf Grapefruit in Greenhouse: Leaf Yellowing and Browning; Lemon Tree Mysterious Decline: No Clear Pathogen, Focus on Cultural Care; Velvet Galls on River Birch: Mite Damage, No Treatment Needed; New Paper Birch Cluster Yellowing in July: Transplant Stress Recovery; Birch Tree Top Leaf Loss: Aphid Infestation Systemic Treatment; Why Some Birch Trees Drop Leaves Early: Genetics vs. Water Stress; River Birch Leaf Drop: Heat and Drought Response

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