Answer: It sounds as if your plant has a fungal disease known as gray mold. This is brought on by too much moisture, overwatering, or too high a humidity?usually it is initiated by a wound of some sort. You can try using a fungicide, but I'd also suggest pinching off the affected leaves to keep the fungus from spreading. Your plants may look a little lopsided after pinching off the affected leaves but they should recover and replace the lost leaves. Good luck with your begonias!
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