Fungus on Mandevilla – How to Treat
My mandevilla has brown spots on leaves. . . either a blight or fungus I assume. How do you treat it? Also, what is the best fertilizer for it?
Certified GKH Gardening Expert
If this is a fungus, neem oil will help. For fertilizer and general care of this plant, here is more information: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm