Tomato plant issues

Good morning all. This morning I noticed some of my tomato plants had leaves turning a little purple and new growth ontop were curled in. I keep them sprayed well and don’t see any bug activity on other plants. Effected varieties are early girl, creole, and one Roma. 12 of the 21 look great and have nice fruit on them. Im in the baton rouge area and have not sprayed any herbicides. Any advice would be appreciated. I am feeding sta green vegetable food and an organic fertilizer 8% N2, 5% calcium, 8% phosphorus, 1% pot ash