Apple Scab Disease - Knowledgebase Question

Desplaines, IL
Question by swid001
April 15, 2001
What should I use to control or prevent apple scab disease? I have a crab apple tree that starts loosing its leaves shortly after it flowers in Spring. Thanks, Ron

Answer from NGA
April 15, 2001


Apple scab is a fungal disease. The fungus overwinters on dead leaves and fallen fruit, so first order of business is to keep debris cleaned up in the garden. The key to successfully controlling scab is to apply fungicides early and thoroughly to protect new growth. Use a wettable sulfur solution or a Bordeaux (lime-sulfur) spray as soon as the cluster buds develop, again at pre-pink, pink, and after petals fall. Avoid spraying when trees are in full bloom.

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