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Diseases & Disorders

A disease can be broadly defined as any departure from the normal condition of plants or plant parts which detracts from their appearance, interferes with their usefulness or reduces their value. Under this definition are included abnormalities caused by fungi (parasitic diseases), and functional disorders (physiological disorders).

In the orchard, diseases can be caused by fungi, bacteria, viruses or mycoplasmas. Postharvest parasitic diseases of apples in the Pacific Northwest are predominately caused by fungi. Disease prevention is essential to preserving fruit quality. Prevention begins in the orchard and includes using properly timed fungicide sprays, practicing orchard sanitation,  harvesting at optimum maturity, and using methods that minimize the bruising of fruit.

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