Cork spot and bitter pit are both physiological disorders of apples caused by low levels of calcium. Visually, cork spots develop anywhere on the fruit, will be relatively small in number per fruit, are sunken and somewhat diffuse spots about 1/2 inch in diameter. Beneath the spot will be a corky area extending into the flesh of the apple. Bitter pit, on the other hand, develop only on the half of the apple opposite the stem, are smaller and a …
What is sunburn damage to apple fruit and how can it be prevented?
Sunburn damage is a skin discoloration of the exposed side of the fruit, and can be caused by several conditions. Sunburn can be prevented by cultural and chemical means. See this article on Sunburn of Apple for detailed information on symptoms and prevention.
… What is apple cork spot and can it be prevented with calcium sprays?
Apple cork spot is a physiological disorder that can affect apple quality and reduce visual appeal. Cork spot generally appears in the outer portion of the fruit flesh as small green dimples or depressions. This disorder may begin developing in June and continue throughout the initial stages of growth and enlargement. The green spots eventually enlarge to corky, discolored areas 1/4 to 1/2 inch into the flesh of the apple. The corky spots may occur anywhere on the fruit flesh.…