Weird White Crud

Weird White Crud

I need some help. I have a bush morning glory that I received as a cutting about two years ago. It is about 4 feet tall now, but only leafy at the very top of the plant. The last couple of days have been very cold, including a freeze, so I moved the plant inside. Leaves started to drop, but I thought it was just the reduction in light causing this. However, today, I was looking at the plant and saw that it has some sort of white crud on it, clustered in lumps around the junctions where the leaves used to be. White crud was building up at the bases of the remaining leaves, too. I scraped some of this stuff off with my fingernail, and it smells like raw potato. The crud is white, granular, and waxy-looking. The granules clump together. Small black granules are mixedin about one per clump. What is this stuff? And how can I get rid of it?
please and thank you

please and thank you

zebra print.

zebra print.

My Bedroom

My Bedroom

I love working in my yard!

I love working in my yard!

Pretty daisies.

Pretty daisies.

my home.

my home.