I've had a problem with early blight every year I've grown tomatoes, even with using a different site for them. I have some coppper funcicide that I was thinking of trying, but am unsure about the best time to apply it or if it was even the best way to approach the problem. I live in Southeast Coastal Georgia and am planting the t omatoes in a 4x4 garden bag. I am using commercial soil to which I've added used coffee grounds from Starbucks and aged chicken manure. I would be most grateful for help to address this issue. Thank you.