It appears along and around the vascular bundles when the symptoms are severe, but there is no external indication of the disorder.
Cavities are usually dry and surrounded by apparently healthy tissue.
This disorder can occur in fruit while still on the tree. It is more obvious, however, after 2-6 week cold storage. However, climatic factors, such as a fluctuating hot and cool summer, or high rainfall right before harvest may enhance the incidence of this disorder. There is no effective way to control FSD since definite causes have not been identified. The problem is the inability to predict or diagnose FSD without cutting the fruit.