Flowering Crabapple Apple Scab: Classic Symptoms and Control

Tree blooms beautifully but loses leaves after petal fall; by August ¾ gone. Classic apple scab (Venturia inaequalis).

Symptoms

Spores overwinter in fallen leaves; infect in wet spring (9 days to symptoms).
Sanitation: Rake/burn/dispose leaves in fall.
Fungicide: Apply at bud break, repeat late spring & early summer. Vigilance needed due to short germination period.
Resistant varieties best for new plantings.

Plant Diseases: Black Sooty Mold on Hackberry: Controlling the Aphids and Scale Behind It; 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; Flowering Pear Premature Browning: Pear Decline Syndrome; Carrotwood Pale Curled Leaves After Pruning: Stress or Pests?; Crab Apple White Fluffy Growth: Scale or Powdery Mildew?; Flowering Plum Pale Leaves and Trunk Swelling: Fertilizer Response and Wait-and-See; Lichens on Crabapple: Harmless but Manageable; Eliminating Crabapple Fruit with Florel Growth Regulator

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