Blister Spot of Apple
Pseudomonas syringae pv. papulans
Applebacterial
A bacterial disease producing raised dark blisters on fruit skin, mainly on susceptible cultivars.
Symptoms
Small, raised, dark blisters on the fruit skin, mainly affecting susceptible cultivars such as Mutsu.
Favorable conditions
- •Warm, wet weather after petal fall
- •Overhead irrigation during fruit development
Management
- 1Apply copper sprays timed after petal fall
- 2Avoid overhead irrigation during fruit development
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