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Interseeded annual ryegrass, oilseed radish, and crimson clover tolerance to residual herbicides commonly used in corn

Published online by Cambridge University Press:  24 September 2019

Aaron P Brooker ,
Christy L Sprague Open the ORCID record for Christy L Sprague [Opens in a new window]  and
Karen A Renner Open the ORCID record for Karen A Renner [Opens in a new window]
Aaron P Brooker
Affiliation:
Graduate Research Assistant, Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, USA
Christy L Sprague*
Affiliation:
Professor, Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, USA
Karen A Renner
Affiliation:
Professor, Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI, USA
*
Author for correspondence: Christy Sprague, Professor, Department of Plant, Soil and Microbial Sciences, Michigan State University, 1066 Bogue Street, East Lansing, MI 48824. Email: sprague1@msu.edu
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Abstract

Cover cropping is limited by seasonal constraints following corn harvest in the Upper Midwest of the United States. Grass, clover, and brassica cover crops can be interseeded in corn; however, this is problematic because cover crops must tolerate herbicide applications to manage weeds. The objective of this research was to determine the tolerance of broadcast interseeded annual ryegrass, oilseed radish, and crimson clover to PRE and POST residual herbicide applications in corn. From 2016 to 2018 field trials were conducted in Michigan to determine the tolerance of annual ryegrass, oilseed radish, and crimson clover to 13 PRE and 14 POST (applied to V2 corn) herbicides. Cover crops were interseeded into corn at the V3 and V6 stages. Greenhouse experiments to evaluate these species were also conducted from 2016 to 2018; PRE and POST herbicides were applied at 1×, 0.5×, and 0.25× (0.25× was PRE only) of field-application rates. Based on these results, annual ryegrass can be interseeded into V3 or V6 corn following a PRE application of atrazine, clopyralid, saflufenacil, bicyclopyrone, isoxaflutole, or mesotrione, or a POST application of atrazine, bromoxynil, or mesotrione. Oilseed radish can be interseeded into V3 or V6 corn following a PRE application of clopyralid, atrazine, S-metolachlor, bicyclopyrone, or isoxaflutole or at V6 following application of acetochlor, dimethenamid-P, or mesotrione. Oilseed radish can also be interseeded following POST application of atrazine (571 g ai ha−1), bromoxynil, fluthiacet, acetochlor, mesotrione, dicamba + diflufenzopyr, or dimethenamid-P + topramezone. In greenhouse trials, crimson clover was tolerant to rimsulfuron, saflufenacil, and pyroxasulfone applied PRE. Annual ryegrass and oilseed radish can be interseeded into corn at the V3 and V6 stages, but special attention must be given to cover crop species selection and herbicide label restrictions when following herbicide applications in corn.

Keywords

David Johnson, Corteva Agriscienceacetochloratrazinebicyclopyronebromoxynilclopyraliddicamba + diflufenzopyrdimethenamid-PflumetsulamfluthiacetglyphosateisoxaflutolemesotrionerimsulfuronsaflufenacilS-metolachlortopramezoneannual ryegrass, Lolium perenne L. spp. multiflorum (Lam.) Husnotcorn, Zea mays L., crimson clover, Trifolium incarnatum L.oilseed radish, Raphanus sativus L.cover cropsresidual herbicides
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 1 , February 2020 , pp. 35 - 41
Copyright
© Weed Science Society of America, 2019 

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