reusing soil where tomatoes have wilted
I recently had a large tomato in a pot wilt suddenly. It had plenty of water, Rather than throw out the soil I used it to top dress patch of grass. Now that grass patch has died. Would the same thing as wilted the tomatoes caused this?
Certified GKH Gardening Expert
Yes it is possible that a soil borne fungus disease affected the tomato plant and was transmitted to the grass. I suspect "fusarium wilt".
It is difficult to control, but a preventive approach is keeping the grass and other nearby plants as healthy as possible with good soil fertility and water management.
There is a biological fungicide specific for fusarium prevention, but it should not be considered as a cure for active infections, only for prevention of further infections.
Mycostop is available in the US, I'm not sure about Australia: