Friday, May 27, 2011

May 27 - The Tag Alder - Alnus serrulata
The Tag Alder tree is called also the Hazel Alder.  The Tag Alder tree actually improves the fertility of the soil in which this tree grows by providing additional nitrogen by a process called nitrogen fixation.

This tree is the host plant to four moth species.  This is the caterpillar of the Iron Prominent moth (Notodonta dromedarius).  It was photographed after it fell from an Alder tree.
Derek Parkinson [CC-BY-SA-2.0 (], via Wikimedia Commons


  1. Perhaps the caterpillar dropped down intentionally, looking for a place to pupate in the ground. When I find one hanging from a tree, I take it home and more often than not it starts building a cocoon promptly. I can get pictures of the caterpillar, the pupa and the adult this way.

  2. Great idea!!! Thank you for joining A Year With the Trees! Welcome!!