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Diagnosing and Treating Apple Scab on a Backyard Tree

New property has apple tree with black spots inside every apple (inedible parts, but rest delicious). Tree has many vertical branches. Told it's a "crab apple" needing fumigation. Spring coming—what to do?

Apple Scab and Sucker Management

Black spots inside fruit = likely apple scab (fungal disease). Vertical branches = water sprouts/suckers—remove them. Don't guess at sprays. Take photos + branch sample to your county extension agent for exact diagnosis and spray schedule. Tell me your state/county and I'll find your agent. Proper pruning + targeted fungicide program at correct timings controls scab.

Seeding and Propagation: Diagnosing Apple Tree Fruit and Leaf Problems; Crab Apple White Fluffy Growth: Scale or Powdery Mildew?; Crabapple Defoliation: Identify Pest Before Spraying; Diagnosing Red Mounds on Ornamental Crabapple; Stopping Tree Sprouts After Cutting Down Crabapples; Lichens on Crabapple: Harmless but Manageable; Eliminating Crabapple Fruit with Florel Growth Regulator; Transplanting Crabapple Seedlings: Root Ball and Timing; Diagnosing and Treating Crabapple Leaf Spots and Defoliation; Crab Apple Defoliation from Mold: Fungicide Spray — Prevents Repeat

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