curling of top of tomato plant leaves

Question

I am growing tomatoes in a small greenhouse. They did well for 3-4 weeks after transplanting, but then the top leaves of the plants started to curl and shrivel. The bottoms of the plants look healthy and are producing tomatoes. I have kept the door open and the greenhouse well ventilated. Peppers in the same space developed aphids, which I have managed to control with insecticidal soap, and I see no evidence of any insects on the tomato plants. The shrivelled leaves are not discolored. Any ideas?

Answer 1

It may be curly top virus. This article will help explain more:
http://aces.nmsu.edu/pubs/_h/h-106.html