Asian Longhorned Beetle
   Brief account of the introduction of this Chinese insect into North America, and with a list of the affected species.
   http://www.asian-longhorned-beetle.com

Brown Spruce Longhorn Beetle
   Brief account of this pest of spruce trees, its growth, and means of control.
   http://www.brown-spruce-longhorn-beetle.com

Bugwood Network, The University of Georgia
   Extensive resource on forest insects and related topics.
   http://www.bugwood.org/

California Oak Mortality Task Force
   Task force focusing on the pathogen causing Sudden Oak Death disease through research, management, education and public policy.
   http://www.cnr.berkeley.edu/comtf/

Exotic Forest Pest Information System for North America
   Database containing information on exotic insects, mites and pathogens with potential to cause significant damage to North American forest resources.
   http://spfnic.fs.fed.us/exfor/

Focus on Woody Plant Diseases
   Information by host plant on diseases and damages affecting trees and perennial flowers from the University of Illinois Extension.
   http://www.urbanext.uiuc.edu/focus/

Forest and Shade Tree Pathology
   Online textbook, news and upcoming meetings of forest pathology.
   http://www.forestpathology.org/

Forestry Images
   Quality photographs of forest insects and disease organisms. Contains image search or browse by categories.
   http://www.forestryimages.org/

Gypsy Moth
   A short account of this caterpillar pest of maples, oaks and elms.
   http://www.gypsy-moth.com

Gypsy Moth in North America
   Extensive information on the biology, impact, distribution and management of this exotic insect in North America.
   http://www.fs.fed.us/ne/morgantown/4557/gmoth/

Insects and Diseases of Eastern Canada's Forests
   An extensive collection of images and a variety of information on the main insects and diseases of the forests of Quebec and Eastern Canada.
   http://www.cfl.scf.rncan.gc.ca/collections-cfl/home.html

Invasive and Exotic Species of North America
   Provides extensive information on all kinds of invasive species in North America.
   http://www.invasivespecies.gov/

Monitoring Sudden Oak Death
   Created by the University of California's Sudden Oak Death Research Team, this site monitors the distribution of the disease.
   http://kellylab.berkeley.edu/SODmonitoring/

Plant disease diagnostics (Minnesota)
   Plant disease diagnostics by the University of Minnesota Extension Service. Mainly designed for plant disease problems in yards and gardens. It is based on visual observations of symptoms. It has a section on trees that might be useful in forestry.
   http://www.extension.umn.edu/projects/yardandgarden/diagnostics/

Tent Caterpillars
   The Eastern tent caterpillar affects black cherry trees and other fruit and shade trees. The forest tent caterpillar infests hardwood trees such as sugar maple and oak.
   http://www.tent-caterpillar.com

US Forestry Service Pest Alerts
   Collection of forest and tree health publications and fact sheets, primarily for midcontinent North America.
   http://www.fs.fed.us/na/morgantown/fhp/palerts/palerts.htm

USDA Forest Insect and Disease Leaflets
   USDA technical publications that address specific tree pests and diseases, including identification and control.
   http://www.na.fs.fed.us/spfo/pubs/fidlpage.htm