Strange Wilting Leaves (not crown rot)
Over the past six months or so, I have had a problem with a few of my violets that has me a little baffled. This isn't crown rot, as I have tried to scrape down what I thought would be a rotten "stem", and all was ok.
Leaves, slowly (over a period of weeks) begin to go limp one at a time. The leaf itself looks ok, it is the leaf stem, usually up where it joins the leaf, that gets skinny and causes the leaf to wilt. I then break off the leaf at the base. Eventually, enough of the leaves come off that it seems like the plant isn't growing and I am left with the crown and a few leaves around it. A couple of plants I eventually threw out, as the leaf problem wasn't improving.
This doesn't affect all of my plants - the more established ones (that I have had for several years) seem OK so far.
A little background - I have had some *mild* powdery mildew and a *few* fungus gnats. I treated the powdery mildew, but haven't sprayed the gnats yet, as the spray says to not use in conjunction with sulpher for at least a month (that is what is in the fungicide). Could the mildew/gnats be the problem? Any other suggestions/ideas?
Thanks for any help or advice that can be offered.