Physiological Disorders

Blossom End Rot

A physiological disorder associated with insufficient uptake and translocation of calcium to the fruit. For control, ensure adequate moisture and calcium in the soil. It is essential to maintain uniform soil moisture throughout the season. Do not permit plants to wilt during hot days. Do not use urea or ammonium sources of N for sidedressing or fertigation because these forms of nitrogen inhibit calcium uptake. Avoid injuring roots.

Blotchy Ripening and Greywall

This is a poorly understood physiological disorder that seems to be a consequence of any environmental stress that slows the growth of the plant. It probably is due to sudden stress that occurs at some point early in fruit development. Avoid those varieties which show excessive symptoms. Improper temperatures, moisture levels, cloudiness or nutrition can contribute to this problem. TMV has been associated with this disorder. Avoid injury to roots. Do not sidedress with urea or ammonium sources of nitrogen.

Fruit Cracking

See Greenhouse Tomato.