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U.S. Department of Agriculture
National Invasive Species Information Center
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Invasive Species Resources

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Biological Control: A Guide to Natural Enemies in North America
Cornell University. Agriculture and Life Sciences.
This guide provides photographs and descriptions of biological control (or biocontrol) agents of insect, disease, and weed pests in North America. It is also a tutorial on the concept and practice of biological control and integrated pest management (IPM). Whether you are an educator, a commercial grower, a student, a researcher, a land manager, or an extension or regulatory agent, we hope you will find this information useful.
Integrated Pest Management
University of Missouri-Columbia.
Integrated Pest Management Program
University of Massachusetts - Amherst. Extension.
Johnsongrass Control in Cropland (PDF | 257 KB)
University of Delaware. Cooperative Extension.
See also: Weed Management Guides for more species
New York State Integrated Pest Management Program
Cornell University.
Ohio, Indiana, and Illinois Weed Control Guide (2017)

Ohio State University Extension; Purdue University Extension; University of Illinois Extension.

The Weed Control Guide, a joint publication from the Cooperative Extension Services in Ohio, Indiana, and Illinois, explains the importance of weed control and gives suggestions on herbicide management strategies for corn, popcorn, sweet corn, soybeans, small grains, and forages.