Begonia Leaves Turning Brown

Updated July 20, 2017

Begonia plants, encompassing over 1,000 species, are prized for their lovely leaves and flowers. Browning of begonia leaves indicates a problem with the plant.

Powdery Mildew

A disease called powdery mildew results in begonia leaves eventually turning brown if heavily infected. Powdery mildew is manifested initially by small white spots appearing on the leaves. This disease is treated by removal of infected leaves and using proper fungicide as soon as the spots appear.

Leaf Spot Diseases

Leaf spot diseases, such as gloeosporium and cladosporium, cause brown and tan spots to appear on begonia leaves. The spots range in size and amount. These diseases are treated by removing infected leaves or using specific fungicides.

Botrytis Blight

Botrytis blight is a fungal disease that results in brown spots appearing on begonia leaves. Some leaves have so many spots that the leaf appears to turn brown in colour. Removing infected leaves and using proper fungicides will treat the begonia plant.

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About the Author

Hayley Smith is a freelance documentary filmmaker and writer with a Bachelor of Arts in English and a Master of Arts in Middle Eastern studies. She has contributed written work to various websites, specializing in topics on the outdoors and Utah skiing.