Brown spots on Mandivilla

Why is my Mandevilla getting big brown spots on its leaves?
Submitted by BHGPhotoContest

This sounds like a foliar fungal disease. Fungal diseases usually develop when humidity is high, air circulation is poor, and temperatures are moderate to high. If conditions turn drier soon the disease may not progress. If the problem is progressing, you may want to use a protective fungicide spray to prevent spread of the disease.


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