Russian Knapweed (<i>Acroptilon repens</i>) Control with Low Rates of Aminopyralid on Range and Pasture

Enloe, Stephen F.; Kyser, Guy B.; Dewey, Steven A.; Peterson, Vanelle F.; DiTomaso, Joseph M.

doi:10.1614/ipsm-08-088.1

Cited by 13 publications

(12 citation statements)

References 14 publications

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“…In contrast, cover of annual grasses in rimsulfuron and imazapic plots was similar to cover in untreated controls but was significantly lower than in aminopyralid treated plots. At all three sites, the dominant broadleaf species were members of the Asteraceae (Table 1), a family that is known to be sensitive to aminopyralid (Enloe et al 2007(Enloe et al , 2008Seefeldt and Conn 2011). In contrast to annual grasses, aminopyralid dramatically reduced, and often eliminated, broadleaf cover at all sites (Table 4).…”

Section: Effects On Other Speciesmentioning

confidence: 99%

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Preemergent Control of Medusahead on California Annual Rangelands With Aminopyralid

Kyser

Peterson²,

Davy³

et al. 2012

Rangeland Ecology & Management

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Medusahead (Taeniatherum caput-medusae [L.] Nevski), the most problematic invasive grass on many California rangelands, is difficult to control selectively in grasslands. Prescribed burning, grazing, and herbicides have been tested with some success but are not practical in all situations. The selective herbicide aminopyralid, normally used for control of certain broadleaf species such as thistles, suppresses some annual grasses when applied pre-or early postemergence. In 2009-2010, we tested the efficacy of aminopyralid for medusahead control in preemergence applications at three foothill rangeland sites in northern California. We compared a rate series of aminopyralid (53, 88, 123, and 245 g Á ha À1 acid equivalent [ae]) with rimsulfuron (18 and 35 g Á ha À1 active ingredient) and imazapic (140 g Á ha À1 ae). Plots were 339 m with four replications at each site. Treatments were applied in early fall 2009. In May 2010, we took visual cover estimates and biomass/seedhead samples in three quadrats per plot. In regression analysis, medusahead cover was found to decrease consistently with increasing rates of aminopyralid. Medusahead control at the highest rates of aminopyralid was consistent across the three sites, averaging 89% 6 3 standard deviation (SD) with 245 g Á ha À1 ae and 59% 6 10 SD with 123 g Á ha À1 ae. Aminopyralid at lower rates, rimsulfuron, and imazapic were less consistent. Cover of other annual grasses increased in plots treated with aminopyralid at all sites. Aminopyralid has potential utility for suppressing medusahead, particularly in sites also infested with invasive members of the Asteraceae. However, the most effective rate (245 g Á ha À1 ae) is registered for use only as a spot application. In situations where this rate can be justifiably used, it would be expected to give season-long control of medusahead, as well as longer-term control of thistles and other susceptible species. Resumen Medusahead (Taeniatherum caput-medusae [L.] Nevski), la especie de pasto invasiva má s problemá tica en muchas á reas de California, es difícil de controlar selectivamente en los pastizales. Se ha probado el fuego prescrito, el pastoreo, y los herbicidas con algo deéxito pero no son prá cticos en todas las situaciones. El herbicida selectivo aminopyralid, normalmente usado para el control de ciertas especies de hoja ancha como cardo, suprime algunos pastos anuales cuando se aplica durante la etapa de pre o al inicio de pos-emergencia. In 2009-2010 se evaluó la eficiencia de aminopyralid para controlar medusahead en aplicaciones pre-emergentes en tres sitios localizados en pastizales del norte de California. Se compararon una serie de rangos de aplicación de aminopyralid (53, 88, 123, y 245 g Á ha À1 acido equivalente [ae]) con rimsulfuron (18 y 35 g Á ha À1 de ingrediente activo) e imazapic (140 g Á ha À1 ae). Las parcelas fueron de 3 m por 9 m con cuatro repeticiones en cada sitio. Los tratamientos se aplicaron durante el inicio del verano de 2009. En mayo de 2010 se tomo una estimación visual de la cobert...

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Section: Effects On Other Speciesmentioning

confidence: 99%

“…; Enloe et al 2007), Russian knapweed (Acroptilon repens [L.] DC. ; Enloe et al 2008), orange hawkweed (Hieracium aurantiacum L.; Seefeldt and Conn 2011), and tropical soda apple (Solanum viarum Dunal; Ferrell et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Preemergent Control of Medusahead on California Annual Rangelands With Aminopyralid

Kyser

Peterson²,

Davy³

et al. 2012

Rangeland Ecology & Management

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“…and species of knapweeds (Centaurea spp.) [34]. It is formulated as a salt and often combined with other herbicides to increase weed spectrum.…”

Section: Synthetic Auxins or Growth Regulatorsmentioning

confidence: 99%

Herbicides for Natural Area Weed Management

MacDonald¹,

Gettys²,

Ferrell³

et al. 2013

Herbicides - Current Research and Case Studies in Use

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“…on dykelands (Beaton 2014) and lack of availability of alternative products with similar efficacy (R Hoeg, Nova Scotia Department of Agriculture, personal communication). Aminopyralid is a synthetic auxin herbicide commonly used for early POST and POST control of annual and perennial broadleaf weeds in pastures, rangelands, and non-crop areas (Enloe et al 2007(Enloe et al , 2008Ferrel et al 2006). Weed control is generally most consistent following POST applications (Kyser et al 2011), but early POST applications control perennial weed seedlings (Ferrel et al 2006) and may suppress developing shoots of some perennial plants (Seefeldt et al 2013).…”

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confidence: 99%

Sequential Aminopyralid and Imazapyr Applications for Japanese Knotweed (Fallopia japonica) Management

Boyd

White

Larsen

2017

Invasive plant sci. manag.

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Japanese knotweed is an invasive plant that occurs along waterways, highways, abandoned agricultural land, and other disturbed areas. It reduces plant diversity and can increase shoreline erosion. An experiment was conducted in Bible Hill and Antigonish, NS, Canada to evaluate early POST aminopyralid at 120 g ae ha−1 and POST imazapyr applications at 720 g ae ha−1 at maximum shoot height, flowering, senescence, maximum height+flowering, maximum height+senescence, flowering+senescence, and maximum height+flowering+senescence. Early POST aminopyralid only provided 10% to 15% control at 52 wk after treatment (WAT) whereas 83% to 100% control occurred following imazapyr applications at all application timings. Percent control at 2, 4, and 8 WAT tended to be higher where imazapyr followed aminopyralid. By 52 WAT, equivalent damage ratings and reductions in stem density occurred at both sites in all plots where imazapyr was applied. The use of aminopyralid or multiple imazapyr applications provided no additional benefit over a single imazapyr application. We conclude that early POST aminopyralid suppresses knotweed growth, which should facilitate late-season imazapyr applications, especially in large stands.

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Russian Knapweed (Acroptilon repens) Control with Low Rates of Aminopyralid on Range and Pasture

Cited by 13 publications

References 14 publications

Preemergent Control of Medusahead on California Annual Rangelands With Aminopyralid

Preemergent Control of Medusahead on California Annual Rangelands With Aminopyralid

Herbicides for Natural Area Weed Management

Sequential Aminopyralid and Imazapyr Applications for Japanese Knotweed (Fallopia japonica) Management

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