Trees
Arboriculture On-Line
http://spectre.ag.uiuc.edu/~isa/
A WWW resource designed by “The International Society of Arboriculture (ISA)” and
the University of Illinois Cooperative States Research, Education, and Extension
Service (ICSREES)” to assist tree care professionals. Offers links to information
at universities and other institutions throughout the world as well as “Arborist
News,” newsletter of the ISA.
The Tree Doctor
http://www.1stresource.com/t/treedoc/
This is the place to go to find answers to your urban tree questions. Find out about
tree diseases and pests, tree topping, and organic bio-stimulants. There is also
a directory of professional arborists. The Tree Care Doctor will gladly answer your
questions.
Trees of the Pacific Northwest
http://www.orst.edu/instruct/for241/
From Oregon State University, challenges you to identify coniferous tree types of
the Pacific Northwest by use of a “dichotomous key.” If you don’t have a conifer
handy, you can try to identify a pictured “mystery tree.” Also provides links to
other tree-related sites.