Begonia brown spots

A tan papery patch limited to the exposed side can follow sun or handling. Wet-looking lesions that enlarge or appear on neighboring leaves need prompt attention.

Keep spotted foliage dry

Separate the plant, remove badly affected leaves with cleaned tools, and water the mix without splashing leaves. Give leaves space to dry; misting does not treat a leaf spot. Rapidly spreading lesions warrant identification by a plant diagnostic service.

For fixed scorch, filter the intense sunlight and retain healthy leaf tissue. Begonias vary widely, so use light conditions suited to the type you grow rather than treating every begonia as a deep-shade plant.