I have tomato leaf curl on 3 of 20 plants. The three are next to each other, and the same variety as three other plants. Reviewing the likely causes in Rodale's Garden Problem Solver, it isn't herbicide, because I don't use it; we have had heavy rain - on all 20 plants of course; there is vein discoloration on the underside, but I rule out beet curly top virus because my beets are healthy. I'm in southeast Michigan. I have made one change this year - use of Sea-90 sea minerals.

Any ideas? Regards, Peter.