Responses of Ventenata dubia and other species seven years after herbicide applications to an improved pasture in Montana

作者：Jane M. Mangold, Lilly Sencenbaugh, Audrey J. Harvey, Matthew E. Rebis, Lisa J. Rew · 发表于：Invasive Plant Science and Management · 年份：2024 · DOI：10.1017/inp.2024.20 · 被引用次数：5 · 研究领域：Rangeland and Wildlife Management、Ecology and Vegetation Dynamics Studies、Plant and fungal interactions

Abstract We evaluated herbicides for controlling the annual grass ventenata [ Ventenata dubia (Leers) Coss.], with particular interest in indaziflam, a preemergence cellulose biosynthesis inhibitor. In 2016, indaziflam was applied postemergence alone and in mixture with glyphosate, imazapic, propoxycarbazone-sodium, or rimsulfuron to an improved pasture in southwestern Montana. A non-sprayed control was included for comparison purposes. Canopy cover of each species was assessed annually for 7 yr; cover was grouped by life-form and longevity, and species richness was calculated. Five years (2021) after treatment, the seedbank was assessed. Our results indicated that treatments including indaziflam reduced V. dubia cover 1 to 3 yr and even up to 6 yr after application, with V. dubia cover being zero or close to zero. However, at 7 yr (2023) after treatment, V. dubia was low across all treatments, including the non-sprayed control. Perennial grasses and forbs and annual forbs were generally unaffected by any treatment and did not increase in cover over the 7 yr, even though V . dubia decreased. Two years after treatment, species richness was lowest in treatments that included indaziflam, but at 7 yr, species richness was similar across all treatments. Indaziflam depleted the monocot and dicot seedbank, with fewer than 5 seedlings of any species emerging from treatments that included indaziflam, while other treatments resulted in 60 to 165 seedlings per sample (40 cm 3 of soil). ...