Mandevilla plant is losing leaves

Question

Losing leaves and turning yellow. It was a beautiful plant and all of a sudden it appears to be dying. It has white powder-like places on the vine. How do I treat it, what do I use?

Answer 1

This is most likely a disease called powdery mildew, which is caused by a fungus. These articles discuss how to treat it:

https://www.gardeningknowhow.com/plant-problems/disease/get-the-cure-for-powdery-mildew.htm
https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm
https://www.gardeningknowhow.com/houseplants/hpgen/powdery-mildew-treatment.htm