The Q&A Archives: yellow leaves

Question: my mandevilla is developing yellow leaves with spots. What causes and what can I do to stop the spread?

Answer: Leaf spots are caused by fungi or bacteria. Brown or black spots and patches may be either ragged or circular, with a water soaked or yellow-edged appearance. Insects, rain, dirty garden tools, or even people can help its spread.

To control: Remove infected leaves when the plant is dry. Leaves that collect around the base of the plant should be raked up and disposed of. Avoid overhead irrigation if possible; water should be directed at soil level. For fungal leaf spots, use a garden fungicide according to label directions.

Good luck with your mandevilla!

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