Seed Bank Depletion: The Key to Long-Term Downy Brome ( Bromus tectorum L.) Management

Sebastian, Derek J.; Nissen, Scott J.; Sebastian, James R.; Beck, Krzysztof

doi:10.1016/j.rama.2016.12.003

Cited by 40 publications

(37 citation statements)

References 131 publications

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“…Overall, indaziflam provided residual control 2 YAT, ultimately reducing the seed rain back into the soil seed bank. Because invasive winter annual grasses have seed viabilities of approximately 3–5 years, land managers should consider applying a sequential indaziflam treatment 2 or 3 years after initial treatments potentially to exhaust the seed bank of these invasive grasses. The sequential treatments could provide the residual control necessary to reach the 3–5 year seed longevity period .…”

Section: Resultsmentioning

confidence: 99%

“…Because invasive winter annual grasses have seed viabilities of approximately 3–5 years, land managers should consider applying a sequential indaziflam treatment 2 or 3 years after initial treatments potentially to exhaust the seed bank of these invasive grasses. The sequential treatments could provide the residual control necessary to reach the 3–5 year seed longevity period . This management approach could reduce labor and herbicide costs compared with herbicides with limited residual control that require yearly applications (e.g.…”

Section: Resultsmentioning

confidence: 99%

“…The sequential treatments could provide the residual control necessary to reach the 3-5 year seed longevity period. 62 This management approach could reduce labor and herbicide costs compared with herbicides with limited residual control that require yearly applications (e.g. imazapic), while also minimizing the herbicide's environmental footprint.…”

Section: Resultsmentioning

confidence: 99%

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Indaziflam: a new cellulose‐biosynthesis‐inhibiting herbicide provides long‐term control of invasive winter annual grasses

Sebastian

Fleming

Patterson

et al. 2017

Pest Management Science

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INDAZIFLAM: A NEW CELLULOSE BIOSYNTHESIS INHIBITING HERBICIDE PROVIDES LONG-TERM CONTROL OF INVASIVE WINTER ANNUAL GRASSESInvasive winter annual grasses such as downy brome (Bromus tectorum L.) are a threat to native ecosystems throughout the US. These invasive grasses exploit moisture and nutrients throughout the fall and early spring before native plants break dormancy. This results in decreased native species abundance and development of monotypic stands. Short-term downy brome management has been shown to be effective; however, the soil seed reserve has often been overlooked although it's the mechanism responsible for rapid re-establishment. While glyphosate, imazapic, and rimsulfuron are herbicides commonly recommended to control invasive, annual grasses, their performance is inconsistent, and they can injure desirable perennial grasses. Indaziflam is a recently registered cellulose-biosynthesis inhibiting herbicide, providing broad spectrum control of annual grass and broadleaf weeds. Indaziflam (Esplanade ® , Bayer CropScience) is a cellulose biosynthesis inhibiting (CBI) herbicide that is a unique mode of action for resistance management and has broad spectrum activity at low application rates. At

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Indaziflam: a new cellulose‐biosynthesis‐inhibiting herbicide provides long‐term control of invasive winter annual grasses

Sebastian

Fleming

Patterson

et al. 2017

Pest Management Science

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“…Indaziflam has no significant POST activity (Brabham et al 2014) but provides much longer (3þ yr) soil residual control compared with imazapic and rimsulfuron (Sebastian et al 2016(Sebastian et al , 2017a. This long-term residual control provides an opportunity to start the process of winter annual grass seedbank depletion (Sebastian et al 2017b). Indaziflam's low water solubility (3.6 mg L −1 at pH 7) suggests that its interaction with winter annual grass litter will differ compared with imazapic and rimsulfuron.…”

Section: Introductionmentioning

confidence: 99%

The influence of winter annual grass litter on herbicide availability

et al. 2019

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Invasive winter annual grass infestations on rangeland accumulate large quantities of litter on the soil surface, as plants senesce yearly and decompose slowly. It has been speculated that winter annual grass litter can adsorb soil-active herbicides and reduce overall performance. Three experiments were conducted from 2017 to 2018 at the Colorado State University Weed Research Laboratory to evaluate interception and subsequent desorption of herbicides applied to litter from three invasive winter annual grass species with simulated rainfall. Imazapic, rimsulfuron, and indaziflam were applied to medusahead [Taeniatherum caput-medusae (L.) Nevski], ventenata [Ventenata dubia (Leers) Coss.], and downy brome (Bromus tectorum L.) litter at two amounts (equivalent to 1,300 and 2,600 kg ha−1). Rainfall was simulated at 3, 6, 12, and 24 mm at 0, 1, and 7 d after herbicide application. Herbicide concentration from the collected rainfall was measured using liquid chromatography–tandem mass spectrometry. At 2,600 kg ha−1, B. tectorum herbicide interception was 84.3%, while V. dubia and T. caput-medusae averaged 76% herbicide interception. There were no differences in desorption among the three litter types. Simulated rainfall at 0 d after application recovered 100% of the intercepted rimsulfuron and imazapic from B. tectorum litter, while recovery decreased to 65% with rainfall at 1 or 7 d after application. Only 54% of indaziflam could be recovered at 0 d, and recovery decreased to 33% when rainfall was applied at 1 or 7 d after application. Applying soil-active herbicides before forecasted rain or tank mixing with a POST herbicide to provide initial control could potentially increase the amount of herbicide reaching the soil and provide more consistent invasive winter annual grass control.

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“…Reduction in herbicide use might be achieved after several seasons given that the first years after the adoption of conservation tillage, herbicides play an important role in controlling weeds [ 18 ]. Sebastian et al [ 64 ] found the seedbank of downy brome became depleted after 4–5 consecutive years of glyphosate applications. A reduction in herbicide application could also be achieved by diversifying the fallow / WW rotation with crops that can break pest cycles.…”

Section: Resultsmentioning

confidence: 99%

Weed responses to fallow management in Pacific Northwest dryland cropping systems

Martín

Long²,

Gourlie

et al. 2018

PLoS ONE

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A two-year rotation of summer fallow (SF)/winter wheat (WW) is the most common cropping system in low precipitation areas of the U.S. Pacific Northwest (PNW). In SF, multiple tillage operations are used to manage weeds and maximize soil water storage and potential WW yield. Reduced tillage fallow (RTF) is an alternative to SF that leaves >30% of the previous crop’s residue on the surface. A four-year (2014–18) field study was conducted to evaluate the influence of SF and RTF on weed species density, cover and composition in dryland WW; determine if changes in these weed infestation attributes have any influence on crop density and yield; and evaluate economic costs of each type of fallow management. The experimental design was randomized complete block with four replications where each phase of SF/WW and RTF/WW rotations was present every year. Individual plots of WW were divided into a weedy sub-plot with no weed control, general area with chemical weed control, and weed-free sub-plot where weeds were manually removed. Infestations of annual grass and other weeds in weedy sub-plots increased throughout the study. Grass weed cover, consisting mainly of downy brome (Bromus tectorum L.), and total weed cover were significantly lower in WW following RTF than following SF in all years except 2018. Densities of grass and total weeds were similar in both fallow managements indicating that weed plants were larger in WW following SF than following RTF due to earlier or faster emergence. Grass cover differences were not found in general areas likely because of a reduced seedbank. When weeds were present, mean yield of WW was higher following RTF than SF indicating that weeds were less competitive in RTF. Reduced tillage fallow could improve weed management in fallow/WW cropping systems of the PNW compared to SF/WW, particularly if the most problematic species are grasses.

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Seed Bank Depletion: The Key to Long-Term Downy Brome ( Bromus tectorum L.) Management

Cited by 40 publications

References 131 publications

Indaziflam: a new cellulose‐biosynthesis‐inhibiting herbicide provides long‐term control of invasive winter annual grasses

Indaziflam: a new cellulose‐biosynthesis‐inhibiting herbicide provides long‐term control of invasive winter annual grasses

The influence of winter annual grass litter on herbicide availability

Weed responses to fallow management in Pacific Northwest dryland cropping systems

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