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Blossom end rot is a physiological disorder observed in many cucurbits as well as other crops (for example, tomato and pepper). It typically appears as a general rot at the blossom end of developing fruit. Blossom end rot is usually the result of inadequate or uneven irrigation, high humidity, or other factors that slow the movement of water through the plant. Since calcium is taken into the plant with the transpiration stream (water), slow water movement can often lead to temporary calcium deficiencies, resulting in blossom end rot.

Blossom end rot on watermelon fruit.

(Photo: USDA Cooperative Extension Slide Series, Clemson University, Bugwood.org)

Management:

• Provide adequate calcium fertility and proper irrigation.
• Do not use high levels of ammonia fertilizer, which can aggravate this problem.
• Avoid root injury.

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