Why Are the Leaves on My Begonia Wilting?

Identification

• Begonias are susceptible to botrytis blight caused by Botrytis cinerea. The disease is also called gray mold. The fungal growth is more pronounced in cool, wet or humid weather. Botrytis blight affects all parts of the plant, including the leaves.

Damage

• The disease is characterized by the appearance of spots on foliage and flowers. Affected plants become discolored and buds and leaves rot. Foliage wilts and drops. The spots develop indicative gray-to-brown colored spore masses. As the disease progresses, there is twig dieback and buds do not open.

Management

• Remove and discard all infected plant areas. If plants are affected at the base, entirely remove the plant. Avoid overhead watering to minimize moisture on foliage and flowers, as this encourages fungal growth. Fungicidal control options include neem oil, Bacillus subitlis or chlorothalonil.