Sudden death! (Rinaldo)
Just a couple of days ago all my plants looked well. No disease to speak of, only a few pests (aphids, whiteflies, green fruitworms).
A day or so ago the Rinaldo plants (I have two on one stake, in a 10-gallon pot) displayed yellowed leaves. I gave it and the other plants some 7.4.2 fertilizer and watered them in well.
Today the plant (part of it) was wilted. I watered it again and waited a bit. Still wilted. I looked at the ground and noticed one of the two plants had a brown stem. When I felt it, it was spongy and light. The plant was wilting because it was dead at ground level. What could have caused this?
The stem of the other plant is juicy and stout and green at ground level.
I don't know what caused this. Is this disease, or was the plant poisoned by something (it sits on the edge of a parking lot), or was it overfertilized? Should I pull this plant? Will its healthy neighbor be affected?
Thanks in advance.