Tomato leaf curl.

Can anyone tell me why my tom's have leaf curl. They'r about two & a half foot tall ,& were doing very well with three flowering struts on each plant, but now the top leaves are curling quite badly. HELP!!!
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Can anyone tell me why my tom's have leaf curl. They'r about two & a half foot tall ,& were doing very well with three flowering struts on each plant, but now the top leaves are curling quite badly. HELP!!!
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Tomato leaf curl happens when there are large temperature variations and given the recent weather, that is most likely! Keeping the door and all windows/vents open during the day and closing everything at night should help. It's not terminal and won't really affect the crop, so not a big problem.
Thanks Bob. I was beginig to think that no more fruiting would take place, but I will follow your advise.
Regards Biddy.