Why are mandevilla leaves turning brown?
by Ann Conrrad
+1
Hi: does any body knows why some of my Madevilla plant are turning brown color?
Thank you!
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I would like this answer too because mine did the same. However, we had a much hotter summer than usual and this I think contributed to it. It is a little cooler now and they are looking better.
https://answers.yahoo.com/question/index?qid=20070710004521AAHhPkp
https://homeguides.sfgate.com/problems-curling-leaves-mandevillas-31634.html
Here is a helpful link from a great gardening website. https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-disease-problems.htm
It sounds like you have Southern Wilt. There is unfortunately no cure for that.