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Wart potato disease

Thursday, September 10th, 2009

(Synchytrium endobioticum)

Wart is potatoes disease caused by Fungi.

Wart or black wart is widely distributed in temperate and high altitude tropical regions with cold and rainy climates. It may cause considerable yield loss where races of the fungus occur for which resistance has not been introduced. The disease is often associated with powdery scab and does not develop in warm or dry soils.

Symptoms of Wart

Tumors of any size up to several centimetres may develop on stems, stolons, and tubers.

Symptoms usually develop below-ground, but under wet conditions they may appear on stems and foliage. Initially, tumors are white to brownish or of the same colour as normal tissue. Tumors blacken with age and may rot because of secondary organisms. Aboveground warts are green, reddish, or purple, depending on variety.


Varieties that are resistant to races of the fungus should be used. Reduce wart incidence with long crop rotations (5 years or more) in combination with resistant varieties.

Prohibiting the shipment of tubers, particularly seed from infested regions, is effective in limiting disease spread.

Seed of resistant varieties grown in infested soil can spread the disease as well as movement of infested soil or manure adhering to tuber surfaces, farm machinery, or other equipment.

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Powdery Scab Potato disease

Thursday, September 10th, 2009

(Spongospora subterranea)

Powdery Scab isĀ  disease caused by Fungi meet while growing potatoes.
It is present in all potatogrowing areas in temperate zones and in the tropical highlands of Central and South America.

Symptoms of Powdery Scab

Powdery-scabThere are usually no aboveground indications of disease. Initial symptoms are small, light-colour, blister-like swellings on the tuber surface. At an advanced stage, these become dark, open pustules 2 to 10 mm in diameter or larger, containing a brown, powdery spore mass.

Lesions are variable in shape, mostly roundish, and fringed by broken skin. Root galls of up to 15 mm across may form. In large numbers, they reduce plant vigour. When galls are newly formed, their colour is similar to that of normal roots.

Later, as galls disintegrate, the colour rapidly darkens.


Soil fumigation with methane sodium is reported to control powdery scab. Planting in well-drained soils free of disease and a long crop rotation with grasses where disease occurs may reduce incidence.

Plant disease free potato tubers. Resistant potato cultivars exist and should be used.

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