University of Nebraska—Lincoln Extension GWC9 Biology and Management of Horseweed

Extension Publications

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Figure 1.

Corn and Soybean Herbicide Chart

GWC 3

Heavy reliance on glyphosate for weed control has resulted in a serious concern for the long-term viability of this weed management tool and the development of weeds resistant to glyphosate. Repeated use of herbicides with the same site of action can result in the development of herbicide-resistant weed populations. This chart groups herbicides by their modes of action to assist producers in selecting herbicides

to maintain greater diversity in herbicide use and
to rotate among herbicides with different sites of action to delay the development of herbicide resistance.

Herbicides are grouped by the following modes of action: lipid synthesis inhibitors; amino acid synthesis inhibitors; growth regulators; photo-synthesis inhibitors; nitrogen metabolism; pigment inhibitors; cell membrane disrupters; seedling root growth inhibitors; and seedling shoot growth inhibitors. The chart also shows site of action group, number of resistant weed species in U.S. in this mode of action; chemical family; active ingredient and product examples. A separate table lists premix herbicides alphabetically by their trade names so users can identify the premix's component herbicides and their respective site of action group.

The chart is 11 x 25.5 inches and folds to 11 x 8.5 inches.

To order

Corn and Soybean Herbicide Chart (GWC3) is available from your local UNL Extension office or from the UNL Extension Publications Warehouse.

Extension is a Division of the Institute of Agriculture and Natural Resources at the University of Nebraska–Lincoln cooperating with the Counties and the United States Department of Agriculture.

University of Nebraska–Lincoln Extension educational programs abide with the nondiscrimination policies of the University of Nebraska–Lincoln and the United States Department of Agriculture.