Curling Tomato Leaves
All of the upper leaves on our tomato plants (multiple varieties) are curling. A picture of our Sweet 100 attached. Bottom leaves look healthy and doing well. Planted about 3-4 weeks ago. Tops have been curled 24 x 7 for last 1-2 weeks. Variable temps here with no freezing. Typically 70s-80s during days. Plants appear to still be growing (slowly), but concerned about overall health. No apparent bug damage on leaves. We are wondering if we need to replace and replant.
Appreciate any guidance that could be provided. Thank you!