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Black heart is not a serious problem in Kansas, mainly because most potatoes are not stored for long periods, or if they are, they are placed in storage facilities with adequate ventilation. Symptoms of black heart are restricted to tubers in storage. Affected tubers develop a blue-black discoloration of the center portion of the tuber. The discolored tissue is usually firm, although it may become soft upon exposure to warm temperatures. Black heart is caused by oxygen deficiency to the tuber. Even in storage, tubers respire and require a constant source of oxygen. If oxygen is deficient, black heart develops. Storage facilities should be well-ventilated and temperature extremes should be avoided. |
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Web updated 9/01/06 |