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Effects of Ventenata dubia removal on rangelands of northeast Wyoming

Published online by Cambridge University Press:  11 June 2021

Marshall Hart
Graduate Assistant, University of Wyoming, Sheridan Research and Extension Center, Sheridan, WY, USA; Institute for Managing Annual Grasses Invading Natural Ecosystems, Sheridan, WY, USA
Brian A. Mealor*
Associate Professor and Director, University of Wyoming Sheridan Research and Extension Center, Sheridan, WY, USA; Institute for Managing Annual Grasses Invading Natural Ecosystems, Sheridan, WY, USA
Author for correspondence: Brian A. Mealor, University of Wyoming Sheridan Research and Extension Center, 1090 Dome Loop, Sheridan, WY82801. (Email:


Ventenata [Ventenata dubia (Leers) Coss.] is one of several annual grass invaders of the western United States. Ventenata dubia is documented reducing the forage availability for livestock and wildlife as well as lowering biodiversity in the Great Basin. This species has recently spread to the Great Plains, where it could bring these impacts with it. We attempt to answer questions on whether or not conservation practices, in this case removal of V. dubia with herbicide, result in recovery of forage resources and biodiversity. We answer these questions by measuring biomass, cover, and nutrient content 1-yr posttreatment at 9 sites in Sheridan County, WY, conducted in two years. Perennial grasses have higher crude protein and total digestible nutrients than V. dubia, and removal of V. dubia resulted in a positive perennial grass response both years. Further, the differences in pattern of growth between perennial and annual species, with annual grasses quickly senescing early in the year, make perennial grasses a more dependable forage base with higher available nutrients. Interestingly, total biomass and nutrient mass did not change after V. dubia removal due to equal replacement with perennial grasses. Species richness and diversity were unaffected by removal of V. dubia. Our results suggest that managing invasive annual grasses, particularly V. dubia, in the Northern Great Plains can improve forage resources for livestock and wildlife while maintaining species diversity. Therefore, proactive monitoring and management efforts to prevent spread should be prioritized in this region.

Research Article
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Associate Editor: Lisa J. Rew, Montana State University

This article was originally presented as part of the symposium “The Ecological and Biodiversity Impact of Invasive Grass Species and their Management,” co-chaired by Lisa Rew and Timothy Prather, at the 2020 annual meeting of the Weed Science Society of America.


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