Cornell University
Cornell University: A Guide to Natural Enemies in North America
In-depth info on four natural enemies: parasitoids, predators, pathogens, and weed feeders. Great identification of target insects and plants.
Other
Association of Natural Biocontrol Producers
The ANCP site contains information on the history and current research of biological control. This site features profiles of beneficial insects and ANBP events.
Other
Defenders: Biological Pest Control
Safe effective natural biological pest control for gardeners at this site from Defenders. Common pest problems, suggestions for prevention & specifics about common insects. Handy tips.
University of Minnesota
University of Minnisota: Radcliffe's Ipm World Textbook
This is a site designed and used by professors to teach integrated pest management. A part of the National IPM network. Gives great photos and countless suggestions.
University of Wisconsin
University of Wisconsin: Biological Control News
News source for Biological Control (no longer published). Posts back issues, which contain in-depth info on field, fruit, vegetable, and nursery crops in regards to insect control.