Aster Yellows or Hormones?
I can't seem to find the answer to this question: Are floral virescence and phyllody caused only by aster yellows or can a hormone imbalance also be responsible? 3 of my echs have both these symptoms but no leaf veining or yellowing. No other perennials have been affected including the asters and rudbeckia in the same bed. We did have a killing freeze in early spring that damaged or killed a number of my plants and aborted bud production in others. I also sprayed the adjacent lawn with a fertilizer product and there was some overspray but it was before most plants had leafed out. It just seems odd that other than the flowers, the plants seem perfectly healthy and there is, so far, no other affected plants. Or maybe it is just wishful thinking because I really do not want to pull out these echs. They are such a beautiful variety and were very robust the last 2 years. Any advice would be more than welcome.