Look Out For Leafminers


Once eggs hatch, the resulting larvae mine the leaf parenchyma producing large, blister‑like, "blotch" mines.  The mines usually extend from the leaf margin toward the midvein.  Although the leafmines may appear unsightly, these sawflies seldom cause enough damage to significantly harm the overall health of established host trees.  However, severe leafmining damage may produce stress on newly planted trees.

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