Tropicals & Tender Perennials: What's on my plant?, 1 by Sharon_TN

Sharon_TN wrote:
I have no idea what this is. It was just on this one stem, nowhere else on the plant nor on any of the other plants close by. These plants are outside on my deck. I've noticed it before, a week or so ago, and was able to just wipe it off. I inspect the plants carefully at least once a day so I've been able to spot it quickly before it spreads much. But since this is the second time, I guess I need to find out what it is and what can be done about it. Thanks!