I have a cherry tomato variety plant that is getting yellow leaves toward the bottom of the plant. I have posted a picture. I clipped a few of the infected leaves off. It seems to be doing very well otherwise, but I want to try and cure this problem before it gets out of hand. I live in massachusetts and there was one day of very heavy rain recently. I don't know if it is related. I have also seen a few white flies on the plant. Any info as far as a diagnosis and treatment would be very helpful. Thanks!