My neighbor has been having a terrible time with his tomato plants. They all come down with septoria leaf spot. What causes this and how can he prevent it from happening again? The irony is that this man has lovely raised beds, filled with mushroom compost, with drip irrigation and is having a lot of problem with several different veggies he's trying to grow. Meanwhile the same plants are doing just fine in my regular old hose watered beds!! Someday I might build some raised beds myself and I definitely like the drip irrigation, but I do appreciate the irony right now :) thanks for any and all help, Justine