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Birch Leafminers

Birch Leafminers
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Adult birch leaf miners are about 1/8 inch in size, black and fly-like. Females deposit their eggs singly in thin cuts made to the central areas of young leaves, usually near the tips of branches. More than one female may lay eggs in the same leaf.
The larvae of the birch leaf miner causes damage by tunneling into birch leaves. The first indications of birch miner infestation are small green spots on the leaf surface, usually noticeable in May or June, which then form into ugly brown blotches. A birch leaf miner infestation rarely kills birch trees on its own but it is disfiguring and can weaken a tree making it susceptible to borer attack.