Sorry I can't help with your yellow leaf problem. I just cut the leaves off when they get like that. Don't know the cause or a cure. Since my Juliette tomatoes are in 5 gallon buckets, I give them a little Hasta Gro organic fertilizer once a week. No chemicals because I like to pick a tomato, wipe it off on my shirt, and eat it while I pick more. Yum!
