Hollow Heart - Hollow heart, a cavity near the centre of the tuber, results from rapid tuber growth. Walls of the cavities are white to light brown. The disorder is difficult to detect because affected tubers have no external symptoms. They can only be removed with expensive X-ray grading equipment. Hollow heart is promoted by growing conditions that cause rapid tuber enlargement.
Poor stand increases the incidence of hollow heart.
Maintaining uniform soil moisture throughout the entire growing season. Planting to maximize stand of uniform plants and minimize misses. Choice of variety. Adequate potassium fertility. Malformed Tubers - Secondary growth, knobs, and other tuber deformities may be caused by extreme soil temperatures.