How Much Copper Sulfate to Kill Blight Spores
I use 12 gal. containers in a greenhouse 17 x 20' screened sides, glass roof, 50% opened. Center 5' glassed year round. I read about spraying copper sulfate on the soil, letting it dry then watering it in to kill blight spores. I have blight. Should I remove all tomato plant roots? How strong of a solution should I use? I have a small 1 qt boiler I could attach to a 3/8" rod with holes and could push it into the soil and force the steam into the soil. How far apart would the penetrations have to be and how long would I leave the rod at each location to kill the spores? This seems very labor intensive.
Certified GKH Gardening Expert
Injecting into the soil would be beyond my expertise.
Here are some links with more information.