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Posts Tagged ‘POTATO DISEASE’

Pink Rot Potato disease

Thursday, September 10th, 2009

(Phytophthora erythroseptica )

Pink rot is most severe occurs while growing potatoes at soil temperatures of more than 20°C in water-logged soils. It is generally not a major problem.

Symptoms of Pink Rot

Although the disease may cause a wilt with stem decay and potatoes leaf chlorosis, usually only tubers have symptoms of dark brown, water-soaked discoloration and sometimes a rubbery texture.
The colour change of cut potato tuber surfaces is characteristic. Within 5 to 20 minutes, these turn from a nearly normal colour to pink and later to black.

The rot is accompanied by a faint vinegar-like smell. Small lesions at harvest may go undetected but grow during storage, although the disease does not spread in potatoes storage.

Management

This soil- and seed-borne disease is enhanced by excessively wet soil conditions and is controlled by improving drainage.

The potatoes disease can be eliminated by fumigating infested soil, complemented with metalaxyl 5G at planting time and the use of healthy potato seed tubers.

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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.

Management

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 is  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.

Management

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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