Bonfire Begonia Rot


Bonfire is a variety of tuberous begonia grown for its masses of orange flowers and long blooming period. When grown in U.S. Department of Agriculture plant hardiness zones 10 and above, it’s maintenance-free. High humidity and overly moist conditions, however, can lead to rot.


  • The first place you’ll notice symptoms of rot is in the stems–they’ll change color and may collapse. From there, the disease will move to the roots and tubers.


  • The fungus that causes rot resides in the soil. Its spores are commonly spread when water from the soil is splashed onto the plant.


  • The ideal method of control is a fungicide soil drench. Integrated pest management specialists with the University of California, Davis, suggest mefenoxam, applied according to the manufacturer’s instructions.

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