Invasive Species Resources
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Pennsylvania State University. School of Forest Resources.
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.
Maine Department of Agriculture, Conservation and Forestry.