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Vegetative Community Response to Landscape-Scale Post-fire Herbicide (Imazapic) Application

Published online by Cambridge University Press:  26 October 2018

Cara Applestein ,
Matthew J. Germino Open the ORCID record for Matthew J. Germino [Opens in a new window]  and
Matthew R. Fisk
Cara Applestein
Affiliation:
Ecologist, U.S. Geological Survey, Forest and Rangeland Ecosystems Science Center, Boise, ID, USA
Matthew J. Germino*
Affiliation:
Supervisory Ecologist, U.S. Geological Survey, Forest and Rangeland Ecosystems Science Center, Boise, ID, USA
Matthew R. Fisk
Affiliation:
Ecologist, U.S. Geological Survey, Forest and Rangeland Ecosystems Science Center, Boise, ID, USA
*
Author for correspondence: Matthew J. Germino, U.S. Geological Survey, Forest and Rangeland Ecosystems Science Center, 970 Lusk Street, Boise ID 83706. (Email: mgermino@usgs.gov)
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Abstract

Disturbances such as wildfire create time-sensitive windows of opportunity for invasive plant treatment, and the timing of herbicide application relative to the time course of plant community development following fire can strongly influence herbicide effectiveness. We evaluated the effect of herbicide (imazapic) applied in the first winter or second fall after the 113,000 ha Soda wildfire on the target exotic annual grasses and also key non-target components of the plant community. We measured responses of exotic and native species cover, species diversity, and occurrence frequency of shrubs and forbs seeded before (1 to 2 or 9 to 10 mo) herbicide application. Additionally, we asked whether landscape factors, including topography, species richness, and/or soil characteristics, influenced the effectiveness of imazapic. Cover of exotic annual grass cover, but not of deep-rooted perennial bunchgrass, was less where imazapic had been applied, whereas more variability was evident in the response of Sandberg bluegrass (Poa secunda J. Presl) and seeded shrubs and forbs. Regression-tree analysis of the subset of plots measured both before and after the second fall application revealed greater reductions of exotic annual grass cover in places where their cover was <42% before spraying. Otherwise, imazapic effects did not vary with the landscape factors we analyzed.

Keywords

Jane M. Mangold, Montana State UniversityHerbicideintegrated weed managementmultiple interventionpreemergentpostemergentrangelandsagebrush steppeseeded speciesstaged intervention
Type
Research and Education
Information
Invasive Plant Science and Management , Volume 11 , Issue 3 , September 2018 , pp. 127 - 135
Copyright
© Weed Science Society of America, 2018 

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