5 links
Asian Longhorned Beetle
asian-longhorned-beetle.com
Brief account of the introduction of this Chinese insect into North America, and with a list of the affected species.
California Oak Mortality Task Force
cnr.berkeley.edu
Task force focusing on the pathogen causing Sudden Oak Death disease through research, management, education and public policy.
Focus on Woody Plant Diseases
urbanext.uiuc.edu
Information by host plant on diseases and damages affecting trees and perennial flowers from the University of Illinois Extension.
Forestry Images
forestryimages.org
Quality photographs of forest insects and disease organisms. Contains image search or browse by categories.
Invasive and Exotic Species of North America
invasivespecies.gov
Provides extensive information on all kinds of invasive species in North America.