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Leaf RollLeaf roll can be caused by many things. You state the plants are yellowing... it could be water is not reaching those plants or it could mean they have pests sucking on them or it could be disease. Have a look at the leaves and if no pests water them well and also take a look online for pictures of tomato diseases so you can remove them before they infect your other plants.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?