Excessive leaf drop may occur. Post bloom spray of copper is a good control. In fact, many people gamble and plant them the first to middle of February. White fly finds tomato plants a great source of food. They are difficult to control and even commercial growers have problems with white fly.
White fly carries a virus that causes a curling of the tomato leaves.
Many times this condition is attributed to a lack of trace elements but before you draw this conclusion, look on the underside of the tomato leaf for white flies. Malathion can be used for some control but it is not too effective. Gil Whitton, columnist, radio and television host, author and adjunct faculty member at the University of Florida, is a horticultural consultant and tree and plant appraiser.