Sweet potato vine: leaves start turning brown and dying!

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They are growing them in containers in this article.
http://homeguides.sfgate.com/grow-ornamental-sweet-potato-vines-containers-40443.html
This might be why they are turning brown:
http://www.diynetwork.com/how-to/outdoors/gardening/how-to-fight-sweet-potato-lsquowiltrsquo-and-other-diseases
I wish you the best in solving this problem with your potato vine. Every year I think about planting them in my window box, then when I go shopping in our local nurseries for flowers I forget all about them ARGH!
Wishing you the best.
https://www.gardeningknowhow.com/edible/vegetables/sweet-potato/grow-sweet-potato-plant.htm
Thank you!! I will check out the article right now!