This evening, I discovered the same thing is happening to my Fdk. After Dark. However, my Cyc. barthiorum and Cyc. Wine Delight aren't affected.
At any rate, when I turned a leaf over, I saw something crawling and white, but didn't see the same on the underside of the rest of the leaves. I'll be spraying my Fdk. and Cyc.s with Indoor Pharm. I hope that will solve the problem.
I've never had any problems with my Cyc. Wine Delight, which I've had for two years.
