When lime trees are stressed by especially hot or cold weather or are attacked by insects and fungus, the symptoms often include curled leaves. Leaves that are attacked by leaf miners will curl or cup inward, and have squiggly lines on the surface. Aphid damage may appear long after aphids have left the plant. Leaf curl, known more famously as peach leaf curl, is caused by a fungus known as Taphrina deformans. If your lime tree's leaves are curling, you need to take steps to address the problem.
Move potted lime trees to a new location if they exhibit signs of leaf curl caused by extreme weather conditions. Leaves that curl from cold weather will have rust-colored spots on the back side. Warm weather stress can cause leaves to cup, but will not mark the leaves.
Examine leaves for aphids, which appear as little, mite-like brown, white or yellow insects. Most of the time, aphids will have departed before leaves begin to curl. However, if you find any aphids on your leaves, gently wash the leaves and branches of your tree with an insecticidal soap.
Spray leaves with an insecticidal oil to remove leaf miners. Prune away any curling leaves to remove any miners that you may have missed.
Spray leaves with a copper-based fungicide if leaves appear puckered and reddish. This is a sign of the leaf curl fungus.