Petunia diseases (again)
Hi. I used to live in Pennsylvania and had a terrible time growing wave petunias, that would get what I think is phytophthera, wilting disease.
Well, last fall, we moved to Hampton, GA, just a little bit south of Atlanta. I was hoping my difficult petunia days were over, but it is not to be.
Most of the wave petunias in hanging baskets are doing fine, except one died of some kind of disease that made the bottom leaves turn dark gray and mushy. Eventually, the whole plant just suddenly wilts and collapses. One day, it will be fine, and the next--wilted and dying.
I don't know if this is the same disease as the one I had in Philly. It just doesn't look the same to me. In Philly, the disease would always start on one side of the plant and gradually spread to the other. Here, the plant just suddenly wilts and dies. When I pull up the plants, the roots are fine, and the stems look okay, but the leaves underneath are mush. I tried spraying my last remaining in-ground petunia with Chlorothalonil, but it rained a few hours later, washing it off. I tried again tonight, but the plant is already feeling a bit limp, though not quite wilting.
Does anyone have any idea what the disease is? Botrytis, maybe?
We have been in a drought situation for months, so too much rain isn'tthe culprit. We are allowed to water for 25 minutes, 3 times a week, which we do, with a soaker hose. And we have been getting some spotty rain, off and on, for the past month.