This is our first attempt at tomatoes. Black fungus is growing all over it. I looked it up and apparently the fungus is actually growing on honeydew, and the honeydew comes from aphids and whiteflies. So I treated it with All Seasons Horticultural and Dormant Concentrated Spray Oil, but when I checked it a couple days later, it looked even worse.
Perhaps it isn't in the best environment. Our yard doesn't have grass, it's a collection of green weeds, which if I remember correctly, harbor those little bugs.
My other suspicion is that maybe it's the spot where the plant is. It didn't look like this until I moved the container over a spot where the old septic tank used to be. We had it decommissioned two years ago. It had been disconnected when sewer lines were installed, but abandoned. The soil above it won't let anything grow in that spot, (you can see the dead grass in a couple of the pics,) so I'm wondering if that has something to do with it, even though the tomato plant is in a container. Other plants around it that are not sitting on that spot are doing ok.
