Dr. David Orwig introduced teachers to the exotic pest, the Hemlock Woolly Adelgid

Post date:
Nov 20, 2004
Dr. David Orwig introduced teachers to the exotic pest, the Hemlock Woolly Adelg

Dr. David Orwig introduced teachers to the exotic pest, the Hemlock Woolly Adelgid

Photo courtesy of: 
Pamela Snow
From: 
Harvard Forest sets up Summer Institute for Teachers