A Horseweed Population in Wisconsin is Confirmed Resistant to Glyphosate

Figure 2

Figure 2. Horseweed plants (glyphosate-resistant) grown from the seed collected in Jefferson County, Wisconsin compared to a glyphosate-susceptible population and their response to postemergence at glyphosate in the greenhouse at rates ranging from 0x to 4x with 1x being 0.87 kg ae ha-1 (22 fl oz product ac-1). Plants were sprayed when horseweed rosettes measured 2.5 to 5 cm (1 to 2 inches) in diameter.

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