Pumpkin black rot, Didymella bryoniae

Pumpkin black rot, Didymella bryoniae

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: The surface of a pumpkin, Cucurbita pepo, showing developing black rot. In the centre is a sunken lesion caused by the Ascomycete Didymella bryoniae. The site of the original infection is at the centre of the lesion, which has grown radially, dissolving the skin of the pumpkin to produce a granular appearance. At the edge of the circle of growth, and beyond, are smaller centres of secondary infection (off-white areas). The infection softens and liquifies the internal tissues of the pumpkin. D. bryoniae is the most common cause of rotting of stored pumpkins, 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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Keywords: biological, biology, black rot, botanical, botany, cucurbita pepo, didymella bryoniae, fruit rot, harvest damage, insect damage, pumpkin, skin lesion, storage rot

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