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Archived Articles

* 04/04/2009
   Bronze Birch Borer

* 04/04/2009
   Oak Wilt Disease

* 04/04/2009
   Intro to the Emerald Ash Borer

* 04/04/2009
   Girdling Kills Trees

* 04/04/2009
   How to Plant a Containerized Tree

* 04/04/2009
   How to Plant a Bare Root Tree

* 04/04/2009
   The Right Tree in the Right Place

* 04/04/2009
   Trees Love Mulch Rings

* 04/04/2009
   Why Limbs Fall in Your Yard

* 03/30/2009
   Spring Floods Can Drown Your Trees

Tree Articles from Expert Sources

Welcome to Foleys Tree Service.

We're happy to share the most recent information we receive from various tree care organizations. 

Tree Articles

Birch Leafminer


A troublesome pest for a Birch tree is the Birch Leafminer (Fenusa pusilla) . Like the lethal bronze birch borer, it is the larvae of the Birch Leafminer which causes damage by burrowing into Birch leaves in search of nutrients. The first indications of Birch Leafminer infestation are small green spots on the leaf surface, usually noticeable in May or June, which develop into ugly brown splotches. A Birch Leafminer infestation rarely kills Birch trees on its own but it is disfiguring and can weaken a tree making it susceptible to borer attack.

The Birch leafminer season begins in late April to mid-May with eggs laid in slits on the upper surfaces of Birch leaves.  The larvae, small, flat whitish grubs (see image at left) in appearance, emerge in late May or June to begin feeding on leaves. In June or July, the larvae drop onto the ground to pupate.  The adults, small black fly-like insects called sawflies, emerge two weeks later. There can be up to four generations per season depending on the climate.

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