The Q&A Archives: White Leaves On Indoor Begonias

Question: I'm writing for my sister. She said the leaves of her fibrous begonias have started to turn white. Not all of the plants, just two or three of them. I asked if they might have flies or some other mite but she said she didn't see anything. She wonders if this could be due to over-watering. I have only tuberous begonias so I couldn't help her. I did tell her to spray a bit of soapy water just in case it could be bugs. Thank you for your help.

Answer: Begonia leaves can be attacked by powdery mildew, a fungal disease. The plants are prone to the problem, but you can help them avoid it by providing lots of air circulation around the plants. The disease often takes hold when environmental conditions are right (warm days, cool nights, some humidity) and air circulation is poor. Remove the affected leaves to stop the spread of disease.

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