Uptake, translocation and metabolism of aminocyclopyrachlor in prickly lettuce, rush skeletonweed and yellow starthistle

Bell, Jared L.; Burke, Ian C.; Prather, Timothy S.

doi:10.1002/ps.2197

Cited by 25 publications

(45 citation statements)

References 26 publications

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“…These results are consistent with previous reports that translocation of aminocyclopyrachlor is primarily to the meristematic sink tissues of plants (Bell et al 2011;Lindenmayer et al 2013). Honey locust wood chips containing aminocyclopyrachlor caused greater epinasty on tomato plants than wood chips containing aminocyclopyrachlor from Norway spruce trees (Table 2).…”

Section: Resultssupporting

confidence: 95%

Potential Damage to Sensitive Landscape Plants from Wood Chips of Aminocyclopyrachlor Damaged Trees

et al. 2013

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Applications of aminocyclopyrachlor in 2011 to turf resulted in brown and twisted shoots, leaves, and needles; shoot dieback; and in some cases, death of trees and ornamental plants adjacent to treated turf areas. Our research objective was to determine if a sensitive plant could be injured from wood chips (mulch) obtained from aminocyclopyrachlor-damaged trees, and to quantify movement of aminocyclopyrachlor from contaminated wood chips into soil and its subsequent uptake by roots into landscape plant tissues. Tomatoes were grown under greenhouse conditions and mulched with chipped tree branches collected from honey locust and Norway spruce damaged 12 mo previously by aminocyclopyrachlor. Analysis of tomato tissue for aminocyclopyrachlor residues 32 d after mulching found aminocyclopyrachlor in all mulched tomato plants, which was consistent with observations of epinasty on tomato leaflets. Aminocyclopyrachlor residues ranged from 0.5 to 8.0 ppb in tomato plants while chipped tree branches contained 1.7 to 14.7 ppb. Aminocyclopyrachlor residues in the potting soil below the mulch ranged from below the quantifiable limit to 0.63 ppb, indicating that aminocyclopyrachlor can leach from wood chips into soil, causing plant injury. These results indicate that trees damaged by aminocyclopyrachlor should not be chipped and used for mulch or as an ingredient in compost.

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Section: Resultssupporting

confidence: 95%

Potential Damage to Sensitive Landscape Plants from Wood Chips of Aminocyclopyrachlor Damaged Trees

et al. 2013

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“…While Canada thistle had the greatest level of aminocyclopyrachlor translocation to aboveground tissue with 18% 192 HAT (Bukun et al 2010), field bindweed was only slightly less with 14% 96 HAT. Translocation to aboveground tissue in field bindweed was similar to yellow starthistle (9%) 72 HAT, but far greater compared with rush skeletonweed and prickly lettuce (2% and 1%, respectively) (Bell et al 2011). However, translocation to belowground tissue was greatest in field bindweed with 14% 96 HAT, followed by Canada thistle with 6% 192 HAT (Bukun et al 2010).…”

Section: Resultsmentioning

confidence: 93%

“…In prickly lettuce and yellow starthistle, aminocyclopyrachlor absorption was much less compared to field bindweed with 5% and 10%, respectively (Bell et al 2011). It is interesting that field bindweed had similar aminocyclopyrachlor absorption as the two other perennial species previously studied; whereas the two annual species studied had very low aminocyclopyrachlor absorption.…”

Section: Resultsmentioning

confidence: 94%

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Aminocyclopyrachlor Absorption, Translocation and Metabolism in Field Bindweed (Convolvulus arvensis)

et al. 2013

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Field bindweed is extremely susceptible to aminocyclopyrachlor compared to other weed species. Laboratory studies were conducted to determine if absorption, translocation, and metabolism of aminocyclopyrachlor in field bindweed differs from other, less susceptible species. Field bindweed plants were treated with 3.3 kBq14C-aminocyclopyrachlor by spotting a single leaf mid-way up the stem with 10 µl of herbicide solution. Plants were then harvested at set intervals over 192 h after treatment (HAT). Aminocyclopyrachlor absorption reached a maximum of 48.3% of the applied radioactivity by 48 HAT. A translocation pattern of herbicide movement from the treated leaf into other plant tissues emerged, revealing a nearly equal aminocyclopyrachlor distribution between the treated leaf, aboveground tissue, and belowground tissue of 13, 14, and 14% of the applied radioactivity by 192 HAT. Over the time-course, no soluble aminocyclopyrachlor metabolites were observed, but there was an increase in radioactivity recovered bound in the nonsoluble fraction. These results suggest that aminocyclopyrachlor has greater translocation to belowground plant tissue in field bindweed compared with results from other studies with other herbicides and other weed species, which could explain the increased level of control observed in the field. The lack of soluble metabolites also suggests that very little metabolism occurred over the 192 h time course.

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“…The newer chemistries in this study (metsulfuron methyl, aminopyralid, and aminocyclopyrachlor) have all been recommended as having low dose rates, low toxicity to mammals, and a favorable environmental profile (68)(69)(70)(71)(72). However, all have potential for drift and for groundwater contamination, especially in areas with highly permeable soils or where the water table is shallow.…”

Section: Safetymentioning

confidence: 99%

Integrated Vegetation Management (IVM) for INDOT Roadsides

Herold¹,

Lowe²,

Dukes³

2014

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JOINT TRANSPORTATION RESEARCH PROGRAMThe Joint Transportation Research Program serves as a vehicle for INDOT collaboration with higher education institutions and industry in Indiana to facilitate innovation that results in continuous improvement in the planning, design, construction, operation, management and economic efficiency of the Indiana transportation infrastructure. https://engineering.purdue.edu/JTRP/index_html Published reports of the Joint Transportation Research Program are available at: http://docs.lib.purdue.edu/jtrp/ NOTICEThe contents of this report reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views and policies of the Indiana Department of Transportation or the Federal Highway Administration. The report does not constitute a standard, specification or regulation. AbstractWith over 90,000 miles of road in Indiana, it is important that adjoining vegetation be maintained for safety concerns, road structure maintenance and aesthetics. Mowing is currently the main form of vegetation management on INDOT (Indiana Department of Transportation) roadside. Ever-increasing fuel costs and the high labor demand associated with mowing leads to millions of dollars spent on in-house and contract mowing cycles each year. Drastic cost reductions can be achieved by reducing mowing cycles through the incorporation of other management tools including herbicide and native plantings. This study provides data on six herbicide tank mixtures (Milestone/Escort; Milestone/Escort/Plateau; Perspective; Perspective/Plateau; Viewpoint/Streamline; and 2,4-D/Escort/Plateau) and two mowing cycles (one-cycle and two-cycle) at six sites across the state. All herbicide treatments decreased broadleaf cover better than mowing treatments. Herbicide treatments containing Plateau, a plant growth regulator that retards coolseason grass growth, had the shortest grass height. Herbicide mixtures without Plateau were still shorter than mowing plots due to the seedhead suppression qualities found in the selective broadleaf herbicides. A cost savings of over 40% is achieved with one application of herbicide in lieu of one cycle of mowing. Further cost savings can be achieved through the planting of native vegetation, which was the focus of the second portion of this project. Four native seed mixes (western wheat, short grass, tall grass and short grass with forbs)were analyzed for use on right-of-ways. Successful native plantings have reduced maintenance costs for many DOTs across the country by eliminating mowing and herbicide needs. Drought and persistent weeds at study sites resulted in a sparse covering of native species during the year after planting. This is not uncommon for native roadside planting studies since many native grass species require two to three growing seasons to establish. The first portion of this study examines the use of herbicide and mowing at six sites throughout the state of Indiana. Two mowing t...

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Uptake, translocation and metabolism of aminocyclopyrachlor in prickly lettuce, rush skeletonweed and yellow starthistle

Cited by 25 publications

References 26 publications

Potential Damage to Sensitive Landscape Plants from Wood Chips of Aminocyclopyrachlor Damaged Trees

Potential Damage to Sensitive Landscape Plants from Wood Chips of Aminocyclopyrachlor Damaged Trees

Aminocyclopyrachlor Absorption, Translocation and Metabolism in Field Bindweed (Convolvulus arvensis)

Integrated Vegetation Management (IVM) for INDOT Roadsides

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