DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
The surface of a stored pumpkin, Cucurbita pepo, showing developing rot. Two sunken lesions caused by Didymella bryoniae are visible (centre, to upper right), that have developed radially from the point of infection, dissolving the skin of the pumpkin to produce a granular surface showing rings. The infection also softens and liquifies the internal tissues of the pumpkin.D. bryoniae is the most common cause of rotting of stored pumpkins, and presents a variety of appearances, including the eventual development of large lesions consisting of softened black skin on the fruit. Storage rots in pumpkins may be caused by premature harvesting, and mechancial or insect damage to the skin. The risk of rot is also greater in fruits stored at temperatures below 10 degrees centigrade, and by exposure to high humidity.
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