This is likely the work of the citrus leaf miner. More details can be found here. The key identifier is the squiggly tracks on the leaves. This moth and it's larvae can be found on all ages of citrus trees but the damage is more noticeable on younger trees.
Citrus leafminer rarely causes serious damage and management is
normally limited to practices that limit succulent growth and protect
If you feel that you have to try and control this pest these are the recommendations:
- they are attracted to the new growth. Avoid pruning live branches more than once a year, so that the cycles of growth are uniform and short. Once the leaves harden, the pest will not be able to mine the leaves.
- Do not prune damaged leaves since undamaged areas of leaves continue to produce food.
- Do not apply nitrogen fertilizer in summer and fall when leafminer populations are high and growth will be severely damaged.
- Remove water sprouts that develop on branches and above the graft union on the trunk and might act as a site for the moths to lay eggs . Suckers should always be removed.
- Many insecticides registered for residential use do not effectively control citrus leafminer, because they have difficulty reaching the larvae inside the mines.
- Pheromone traps are available
For the homeowner I would recommend cultural practices and pheromone traps or no action over chemical controls.