Leaf Miner

Your problem is likely due to a leaf miner. A small fly or moth lays its eggs beneath the surface of the leaf and when the eggs hatch, the larvae tunnel thru the leaf tissue, consuming the nutrients in the foliage. Once the damage has been done, nothing will reverse it. Chemical pesticides are not effective against this pest because most products won’t penetrate thru the leaf surface and contact the pest. Usually the damage done by these insects is not going to kill the plant, but it may reduce the number of edible leaves on your vegetable plants. Plants that produce fruit (peppers, tomatoes, etc) will still produce good fruit. We recommend seeking the advice of a professional in your area before attempting to control these pests with chemical pesticides.