I am writing to get any help I can to a problem that has beset all of my tomato plants (Better Boy, Silvery Fir Tree, Delicious, Early Girl, Celebrity, and Brandywine). The leaves have begun to curl on all of the plants and I cannot figure out why. I first noticed the problem a couple of weeks ago and sprayed with Daconil; it has not helped. I am horrified that I may lose all of my tomato plants! I don't think it is a watering problem as the plants have had plenty of water the past few weeks and the problem continues. I don't think the problem is insect-related, either, as I don't see any real infestation. I could be wrong, though. If anyone can help, I would be so grateful.