nurtomiPale trails inside leaves
Leaf-miner larvae feed between the surfaces of a leaf.
What to look for
Look for winding pale trails or blotches within the leaf tissue. Damage can vary with the insect and plant, so examine a few leaves and look for an active larva before deciding on a cause.
What to do
Remove a few badly affected leaves when practical and dispose of them away from plants. Watch new growth and avoid broad pesticide use based only on old trails.