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POTATO DISEASE : Common scab

Wednesday, August 5th, 2009

Conditions for development of potato common scab are dry soil, pH basic to neutral, and temperatures conducive to infestation (20-22°C).

Symptoms of common scab

common-scabSymptoms of potato common scab are quite variable. Usually, roughly circular, raised, tan to brown, corky lesions of varying size develop randomly across tuber surfaces.
Symptoms of common scab potato disease are superficial brownish diameter 5-8mm wounds on the tuber. The blemishes can appear on the surface, raising the peel by 1-2mm (russet scab) or causing slight depressions. Usually potato foliage has no visible symptoms.
But common scab severe damage quality of tubers.

Management and control

Cost common recommendation to prevent of common scab while growing potatoes is using of disease-free seed tubers, crop rotation, and optimal irrigation, while maintaining field capacity suitable for potato cultivation.
For growing good crop of potatoes use a 3-5 year rotation, preferably with legumes. Plant scab-free or treated seed on land free of scab. Use an acidic fertilizer, such as ammonium sulfate, for nitrogen and irrigate adequately especially during tuber initiation.
Neutralizing excessively acidic or alkaline soils may help to reduce levels of common scab.
Maintain good moisture levels in the soil while tubers are developing.
Crop rotation in which potatoes will be planted in the same area only once every 3 or 4 years. Avoid rotating with root crops; instead plant grains, grasses, or legumes.
Chemically treating seed pieces before planting with the fungicide Captan will help reduce seedborne potato common scab inoculum.

Organic potatoes