A couple weeks ago I noticed one of my tomato plants started to look funny. It got a darker color green than the other three by it and it's leaves were deformed. I have four different varieties including solar fire, better boy, golden jubilee, and this one is bhn 602. I live in south Texas and this is the first time I have grown tomatoes so I want to experiment with different varieties to see what grows best. Over the last few days it's leaves have started to curl. The other plants look good and I have given them all the same treatment. Mostly just tomato tone. Do I try to keep the plant and see what it does or might it disease the others? Thanks!!