Japanese Eggplant Disease

I'm not sure what is wrong with my Japanese Eggplant. The leaves are turning brown in the margins and curling up. I still have blossoms, but more and more leaves are turning brown. I've been spraying the plant with copper sulfate at the same time I treat my tomatoes (for late blight). I'm not sure what else to do at this point except wait, and hope to get an eggplant later this summer.