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