- US Forestry Service Pest Alerts - Collection of forest and tree health publications and fact sheets, primarily for midcontinent North America.
- Brown Spruce Longhorn Beetle - Brief account of this pest of spruce trees, its growth, and means of control.
- 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.
- Focus on Woody Plant Diseases - Information by host plant on diseases and damages affecting trees and perennial flowers from the University of Illinois Extension.
- Gypsy Moth - A short account of this caterpillar pest of maples, oaks and elms.
- Colorado State - Forest Service - Forest Pest Management - Information sheets on forest pests management (many in PDF format) available from the Colorado State University Cooperative Extension.
- Asian Longhorned Beetle - Brief account of the introduction of this Chinese insect into North America, and with a list of the affected species.
- Bugwood Network, The University of Georgia - Extensive resource on forest insects and related topics.
- Forestry Images - Quality photographs of forest insects and disease organisms. Contains image search or browse by categories.
- California Oak Mortality Task Force - Task force focusing on the pathogen causing Sudden Oak Death disease through research, management, education and public policy.
- Forest and Shade Tree Pathology - Online textbook, news and upcoming meetings of forest pathology.
- University of California Cooperative Extension Sudden Oak Death - Provides practical information on this disease including history, hosts and symptoms, ecology, control and management, recent publications and events.
- USDA Forest Insect and Disease Leaflets - USDA technical publications that address specific tree pests and diseases, including identification and control.
- 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.
- Gypsy Moth in North America - Extensive information on the biology, impact, distribution and management of this exotic insect in North America.
- Invasive and Exotic Species of North America - Provides extensive information on all kinds of invasive species in North America.
- 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.
- US National Forest Health Monitoring Program - US national program designed to determine the status, changes, and trends in indicators of forest condition on an annual basis. Provides forest health highlights by State or Region.
- 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.
- Monitoring Sudden Oak Death - Created by the University of California's Sudden Oak Death Research Team, this site monitors the distribution of the disease.
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