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Potato Internal Rust Spot



P_potintrstspt

Potato Internal Rust Spot

Usually appear in

Autumn


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Caused By:-     Soil lacking in Calcium and or Organic Matter

Description

Potato Internal Rust Spot is believed to be a physiological condition, probably due to low levels of calcium. It often occurs on light sandy soils which lave low organic content. Stress and high temperatures later in the season is also implicated in this condition formation. The symptoms are small brown flecks or spots randomly distributed throughout the tuber. This condition can be mistaken for Potato Spriang, but this condition tends to form arcs of brown tissue in the tuber. Some varieties show some resistance to this condition Visit The British Potato Variety Database for more information.
See also these other rusts Anemone, Antirrhinum, Bean, Bluebelle, Broad Bean, Cedar Quince, Chrysanthemum White, Fucshia, Gladiolus, Gooseberry, Hollyhock, Juniper Pear, Mahonia, Mint, Pear Juniper, Pelargonium, Periwinkle, Plum, Quince, Rhododendron, Rose, Rust, White.


Control

Incorporate organic matter into the soil before planting and apply a general to improved the soil.
Fertilise in spring, particular potash and phosphorus.
Grow only potatoes showing some resistance to this condition.
Avoid abrupt changes in growing conditions and manage watering systems to avoid drought followed by overwatering.
Do not overwater plants in the growing season and water from the base of the plant rather than overhead irrigation.
Aid the plant by keeping the soil pH to about 5.2 which is ideal for potatoes.
Try to get all the potatoes out from the ground at harvest time.
Use only good quality seed potatoes obtained from certified suppliers
Use a 4 year or longer crop rotation where eelworm is a problem. Tomatoes are also susceptible.



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