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Posts Tagged ‘symptoms’

Powdery Mildew Potato disease

Thursday, September 10th, 2009
Powdery mildew, a Biotrophic Fungus
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(Erysiphe cichoracearum)

Powdery mildew is widely distributed on many host plants and developsĀ  also on potato under arid conditions with high humidity.

Symptoms of Powdery Mildew

Old infections superficially resemble late blight as leaves turn black, die, and drop from the plant. Stems may also be infected. Initially, infected potato leaves are covered with whitish spore masses resembling soil residues, dust, or spray deposits.
The disease requires high humidity, but seldom develops where water falls on the leaves as rain or sprinkler irrigation.


Where the disease is severe, biweekly applications of liquid sulfur formulations may be necessary.

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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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