Hello to all!
I have the same problem with my 2 Honeysuckle, actually i had a lot more with one more than the other one, which after 2 years of battles sadly died. Pulling out the roots i discovered at that time, that the roots where rotten and a bug was eating them actually... I thought.: too much water? Ok let's do different with second one. So I put the second one in a larger deeper container with some stones on the bottom to drain better and do not leave the roots in the water at all the time.
It worked well till the end of May, it was grown healthy and beautiful, in June the leaves started to cover of white powder, get yellow and fall down....so sad! I treated with common spray for white meadow, worked at bit, but in July, get worse than before.
So I gave up, I let it go, doesn't matter what ever happen. Suddenly in September it started to put again green leaves and very unexpected some flowers (!!).... It kept green till December! Wow! I was so surprise! Into the while we needed to move in another house, I pruned and moved in the new patio. I found a corner well aired with half sun and placed closed to the fence. It looked great, nice and green till one week ago....now is starting again to get sick....some stalks are dry, without leaves and the others are covered of white powder... I am so upset!.. What I can do????!!
Thank you for any suggestion you would kindly give me.