Evaluating Herbicide Carryover on Cover Crops

To get a sense of which herbicides can be used before a specific cover crop species and which can’t, Purdue University weed scientist Bryan Young compiled research from the University of Wisconsin, Purdue University, University of Missouri and Penn State University, as well as commercial research conducted by retired University of Illinois Extension agronomist Mike Plumer.

The research looked at Dual II Magnum (s-metolachlor) Zidua (pyroxasulfone), Valor (flumioxazin), Spartan (sulfentrazone), Flexstar (fomesafen) and Pursuit (imazethapyr) herbicides’ impact on cereal rye, annual ryegrass, radish and crimson clover. The following charts show the results.

Carryover: Cereal (Winter) Rye

Research conducted at the Univ. of WI (2013, 2014), Purdue Univ. (2013, 2014), Univ. of MO (2014) Penn State University estimates/experience (PSU; Curran and Lingenfelter) Mike Plumer estimates/experience (MP)

*Data interpreted by B. Young

Carryover: Annual Ryegrass

Research conducted at the Univ. of WI (2013, 2014), Purdue Univ. (2013, 2014), Univ. of MO (2014) Penn State University estimates/experience (PSU; Curran and Lingenfelter) Mike Plumer estimates/experience (MP)

*Data interpreted by B. Young

Carryover: Crimson Clover

Research conducted at the Univ. of WI (2013, 2014), Purdue Univ. (2013, 2014), Univ. of MO (2014) Penn State University estimates/experience (PSU; Curran and Lingenfelter) Mike Plumer estimates/experience (MP)

*Data interpreted by B. Young

Carryover: Radish

Research conducted at the Univ. of WI (2013, 2014), Purdue Univ. (2013, 2014), Univ. of MO (2014) Penn State University estimates/experience (PSU; Curran and Lingenfelter) Mike Plumer estimates/experience (MP)

*Data interpreted by B. Young

For more information, check out the article “Finding a Weed Control Plan that Won’t Hurt Your Covers,” published in the July 2017 issue.