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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.
California Academy of Sciences.
Purdue University Extension.
Cornell University. New York State Integrated Pest Management Program.
California Department of Forestry and Fire Protection.