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Effects of herbicide management practices on the weed density and richness in dicamba-resistant cropping systems in Indiana

Published online by Cambridge University Press:  16 September 2020

Connor L. Hodgskiss ,
Travis R. Legleiter ,
Bryan G. Young  and
William G. Johnson Open the ORCID record for William G. Johnson [Opens in a new window]
Connor L. Hodgskiss
Affiliation:
Graduate Research Assistant, Department of Botany and Plant Pathology, Purdue University, Lafayette, IN, USA
Travis R. Legleiter
Affiliation:
Graduate Research Assistant, Department of Botany and Plant Pathology, Purdue University, Lafayette, IN, USA
Bryan G. Young
Affiliation:
Professor, Department of Botany and Plant Pathology, Purdue University, Lafayette, IN, USA
William G. Johnson*
Affiliation:
Professor, Department of Botany and Plant Pathology, Purdue University, Lafayette, IN, USA
*
Author for correspondence: William G. Johnson, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN47907 (E-mail: [email protected])
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Abstract

The addition of dicamba as a weed control option in soybean [Glycine max (L.) Merr.] is a valuable tool. However, this technology must be utilized with other herbicide sites of action (SOAs) to reduce selection pressure on weed communities and ensure its prolonged usefulness. A long-term trial was conducted for 7 yr in Indiana to evaluate weed community densities and species richness with four levels of dicamba selection pressure in a corn (Zea mays L.)–soybean rotation. Monocot densities and richness increased over time in the dicamba-reliant treatment. Dicot densities in the dicamba-reliant treatment declined over time, but dicot richness increased. The soil weed seedbank was affected by the varying herbicide strategies. The dicamba-reliant strategy had greater than 43% higher total weed density than all other treatments, primarily due to having a monocot density that was at least 71% higher than the other treatments. The fully diversified strategy with eight SOAs and residual herbicides used every year had the lowest total weed species richness in the soil seedbank, which supported the in-field observations.

Keywords

Long-termweed shifts
Type
Research Article
Information
Weed Science , Volume 69 , Issue 1 , January 2021 , pp. 88 - 94
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Ramon G. Leon, North Carolina State University

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