What is the best disease control product for leaf fungus's on tomato plants in northeast Indiana?

i think the plants have early blightWhat is the best disease control product for leaf fungus's on tomato plants in northeast Indiana?
My grandmother has had this problem many times in the past and the best thing that we found was some stuff called Captain. It was a powder substance. Blight is a fungus and this stuff stops it really well. They were going brown from the bottom up and my uncle told my grandma to get this stuff. We get it at Rural King. We haven't had one problem with blight since we started using this stuff a few years ago.What is the best disease control product for leaf fungus's on tomato plants in northeast Indiana?
I recently ordered some tomato seeds and with them they


sent some 'calcium fertilizer pellets' to be dissolved in water


and sprayed 'liberally' on the plants once a week. So you can


try your garden center for something like the calcium pellets


I mentioned. Hope it helps!
try to search on google the disease leaf fungus's on tomato plants !!!!!