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Effect of indaziflam on native species in natural areas and rangeland

Published online by Cambridge University Press:  01 May 2019

Shannon L. Clark Open the ORCID record for Shannon L. Clark [Opens in a new window] ,
Derek J. Sebastian Open the ORCID record for Derek J. Sebastian [Opens in a new window] ,
Scott J. Nissen  and
James R. Sebastian
Shannon L. Clark*
Affiliation:
Graduate Research Assistant, Bioagricultural Sciences and Pest Management Department, Colorado State University, Fort Collins, CO, USA
Derek J. Sebastian
Affiliation:
Western Area Sales Manager, Bayer Vegetation Management, Bayer U.S., Research Triangle Park, NC, USA
Scott J. Nissen
Affiliation:
Professor and Extension Specialist, Bioagricultural Sciences and Pest Management Department, Colorado State University, Fort Collins, CO, USA
James R. Sebastian
Affiliation:
Weed Resource Specialist, Boulder County Parks and Open Space, Longmont, CO, USA
*
*Author for correspondence: Shannon L. Clark, Bioagricultural Sciences and Pest Management Department, Colorado State University, Fort Collins, CO 80523-1177. (Email: Shannon.Clark@colostate.edu)
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Abstract

Minimizing the negative ecological impacts of exotic plant invasions is one goal of land management. Using selective herbicides is one strategy to achieve this goal; however, the unintended consequences of this strategy are not always fully understood. The recently introduced herbicide indaziflam has a mode of action not previously used in non-crop weed management. Thus, there is limited information about the impacts of this active ingredient when applied alone or in combination with other non-crop herbicides. The objective of this research was to evaluate native species tolerance to indaziflam and imazapic applied alone and with other broadleaf herbicides. Replicated field plots were established at two locations in Colorado with a diverse mix of native forbs and grasses. Species richness and abundance were compared between the nontreated control plots and plots where indaziflam and imazapic were applied alone and in combination with picloram and aminocyclopyrachlor. Species richness and abundance did not decrease when indaziflam or imazapic were applied alone; however, species abundance was reduced by treatments containing picloram and aminocyclopyrachlor. Species richness was only impacted at one site 1 yr after treatment (YAT) by these broadleaf herbicides. Decreases in abundance were mainly due to reductions in forbs that resulted in a corresponding increase in grass cover. Our data suggest that indaziflam will control downy brome (Bromus tectorum L.) for multiple years without reduction in perennial species richness or abundance. If B. tectorum is present with perennial broadleaf weeds requiring the addition of herbicides like picloram or aminocyclopyrachlor, forb abundance could be reduced, and in some cases there could be a temporary reduction in perennial species richness.

Keywords

James K. Leary, Jane M. Mangold, Montana State UniversityAbundanceBromus tectorumherbicide tolerancerangeland weedsspecies richness
Type
Research Article
Information
Invasive Plant Science and Management , Volume 12 , Issue 1 , March 2019 , pp. 60 - 67
Copyright
© Weed Science Society of America, 2019 

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