Leaf miners are made by a number of species of insects in which the larval stage eats the tissue of the plant. Leaf miners can be made by several different insects. Most leaf miner burrows or tunnels are referred to as serpentine mines, consisting of thin, winding, whitish trails, or as blotch mines which are broad and whitish or brownish in color. These mines may cause heavy infestations, causing the leaves and the entire plant to turn brown by late spring. They feed on the leaf tissue between the upper and lower surfaces of the leaf. Elm leaf miners are a pest that feed on the tissues in between the outer layers of elm leaves causing them to turn brown and the leaf to decay. Just because on leaf on the plant is affected does not mean that the whole plant is affected. Although, overtime this does change due to the amount of insects feeding on the leaves.
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