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ARS Home » Pacific West Area » Corvallis, Oregon » Forage Seed and Cereal Research Unit » Research » Publications at this Location » Publication #401863

Research Project: Improving Plant, Soil, and Cropping Systems Health and Productivity through Advanced Integration of Comprehensive Management Practices

Location: Forage Seed and Cereal Research Unit

Title: Developing and implementing a sustainable weed management program for herbicide-resistant Poa annua in turfgrass

item MCCURDY, JAMES - Mississippi State University
item BOWLING, REBECCA - Texas A&M University
item DE CASTRO, EDICARLOS - Mississippi State University
item PATTON, AARON - Purdue University
item KOWALEWSKI, ALEC - Oregon State University
item Mattox, Clint
item BROSNAN, JAMES - University Of Tennessee
item ERVIN, DAVID - Portland State University
item ASKEW, SHAWN - Virginia Polytechnic Institution & State University
item GONCALVES, CLEBSON - University Of California
item ELMORE, MATTHEW - Rutgers University
item MCELROY, SCOTT - Auburn University
item MCNALLY, BRANDON - Purdue University
item PRITCHARD, BENJAMIN - University Of Tennessee
item KAMINSKI, JOHN - Pennsylvania State University

Submitted to: Crop, Forage & Turfgrass Management
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 3/21/2023
Publication Date: 3/29/2023
Citation: McCurdy, J.D., Bowling, R.G., de Castro, E.B., Patton, A.J., Kowalewski, A.R., Mattox, C.M., Brosnan, J.T., Ervin, D.E., Askew, S.D., Goncalves, C.G., Elmore, M.T., McElroy, S.J., McNally, B.C., Pritchard, B.D., Kaminski, J.E., Bagavathiannan, M.V. 2023. Developing and implementing a sustainable weed management program for herbicide-resistant Poa annua in turfgrass. Crop, Forage & Turfgrass Management. 9(1). Article e20225.

Interpretive Summary: This is the second part of a two-part management guide focusing on integrated weed management of annual bluegrass (Poa annua L.) in turfgrass systems. This paper provides the reader with an overview of how herbicides work, how resistance to herbicide occurs, and how plants are screened for herbicide resistance. A summary of an annual bluegrass resistance survey in the United States is described, followed by a description on how to build an integrated weed management plan to suppress resistant annual bluegrass populations. A table is included that summarizes preemergent and post emergent herbicide efficacy on annual bluegrass safety in cool and warm season turfgrass systems.

Technical Abstract: The ability of Poa annua L. to adapt to most turfgrass environments extends to its adaptation to most known herbicides. Herbicide resistant Poa annua is of almost epidemic proportions. The loss of once viable treatments pushes practitioners towards more expensive, and often less effective, control strategies. Our first paper focuses on ecology, biology, and integrated weed management (IWM) practices for Poa annua control. In this second paper, we focus on herbicide resistance—what it is and how to overcome it. We also discuss resistance mechanisms and document common occurrences of field-level resistance within much of the United States. Finally, we analyze some of the social and economic constraints that practitioners face in the implementation of IWM strategies for Poa annua.