The Birch Leaf Miner is the larvae of Sawfly! The Birch Miner burrows into birch leaves in search of nutrients and makes your beautiful birch trees more susceptible to further disease! If you see small brown or red-brown patches on leaves of your birch trees this could indicate the presence of the Birch Leaf Miner! Adults emerge in spring laying eggs on newly forming leaves. If you notice the presence of Birch Leaf Miners contact Turf King right away! www.TurfKingMuskoka.com