Calcium deficiencies contribute to certain fruit disorders in apple, including bitter pit. Bitter pit is a physiological disorder of apple fruit that has caused serious losses in certain apple varieties for many years. The visible signs may be only slight indentations in the skin with no change in color. The skin over these depressions usually takes on a deeper green color than the surrounding skin, and finally, the disorder appears as small, brown, desiccated pits. The pits may be few …