Apply Azomite (rock dust) soon before the rains come to give all essential micro nutrients to the tree. Apply around the drip line of the tree. Most of those citrus leaves you see now will fall away when new growth forms in late winter/early spring.
Now is also the prefect time to spread organic fertilizer for citrus trees just before the rain comes starting Wed night thru Friday. That's what I will be doing tomorrow morning.
Johnny