This produces a reduction in calcium absorption and accumulation in the tomato leaf tissue. The incidence of blossom end rot is reduced by providing even moisture and avoiding excessive nitrogen fertilizer applications. Although varieties do differ in susceptibility, there are currently none with sufficient tolerance to provide dependable control. Timely and repeated spraying of tomato fruit and foliage with a dilute solution of calcium chloride has been reported to prevent blossom end rot but the benefits are often variable. This disorder appears as a white or light tan discoloration of the fruit that has been exposed to sun.
Discolored areas are sunken and wrinkled and often surrounded by a yellow halo.
Damage is typically found on the top side of the fruit as this is the area most likely exposed to the sun. Sunscald frequently occurs in tomato when the lower leaves drop off due to Septoria and early blight exposing the fruit to intense sun. Secondary fruit rot organisms may invade damaged tissue. Catfacing Catfacing describes the presence of deep indentations in the blossom end of the fruit. In some cases, the fruit itself is misshapen, becoming kidney-shaped or otherwise distorted.