CLM... Citrus Leaf Miner; you can search it here with the search box on the top of the page, or Google it. CLM cannot be treated; only prevented.

The leaves still function well, they just look ugly. Leave them on the tree.

Steve

Citrus leaf miner is not much of a concern on large citrus trees. However, on small young trees the miner does cause quite a stress on the tree . Most commercial growers don't bother with controlling the insect on large producing trees.