If you are lucky enough to live in an area where it is hot enough in the spring with lots of sun before you plant this may help. I tried it in my northern climate but the jury is out on whether it actually worked.
Start with baking soda, one cup for each square yard. Work it in with a rake or hoe. There are fungus-spread blights and insect-spread blights, and the baking soda will help the soil of either. If you haven’t already, dig up all the affected plants and put them in a plastic bag to be carried off. Do not put the grass or plants in a compost heap in your yard. Probably, some sort of beetle or boll has brought the blight. With the removal of the plants, the bugs have probably moved on. But to be sure, use either a commercial blight killer from a farm and garden store, or use a heavy powdering of baking soda with vinegar sprayed over it. This will kill any roots, vines, plants, and most bugs in the area. (You can mix the baking soda and vinegar at 1 pound of soda and 1 cup of vinegar, but it will foam like crazy, so use a BIG bowl, allow it to settle, then pour into a quart spray bottle.) work this mixture into the soil. Wait at least 30 days, with re-sprinkling/powdering/spraying if needed, before you add new topsoil and work that in. Then you can replant. Best wishes, Donald, and keep baking soda and vinegar on hand for many uses. ☺️
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You can try this technique: https://homeguides.sfgate.com/destroy-fungus-soil-35230.html
If you are lucky enough to live in an area where it is hot enough in the spring with lots of sun before you plant this may help. I tried it in my northern climate but the jury is out on whether it actually worked.
Start with baking soda, one cup for each square yard. Work it in with a rake or hoe. There are fungus-spread blights and insect-spread blights, and the baking soda will help the soil of either. If you haven’t already, dig up all the affected plants and put them in a plastic bag to be carried off. Do not put the grass or plants in a compost heap in your yard. Probably, some sort of beetle or boll has brought the blight. With the removal of the plants, the bugs have probably moved on. But to be sure, use either a commercial blight killer from a farm and garden store, or use a heavy powdering of baking soda with vinegar sprayed over it. This will kill any roots, vines, plants, and most bugs in the area. (You can mix the baking soda and vinegar at 1 pound of soda and 1 cup of vinegar, but it will foam like crazy, so use a BIG bowl, allow it to settle, then pour into a quart spray bottle.) work this mixture into the soil. Wait at least 30 days, with re-sprinkling/powdering/spraying if needed, before you add new topsoil and work that in. Then you can replant. Best wishes, Donald, and keep baking soda and vinegar on hand for many uses. ☺️
I found this article which might be of help Donald …
https://www.hunker.com/13406929/how-to-kill-blight-in-garden-soil
Use Epsom Salts in the hole where you put your plants ( tomatoes ) them sprinkle Epsom around the plants once in a while when you water them.