Absorption, Translocation, and Metabolism of Aminocyclopyrachlor in Tall Fescue (<i>Lolium arundinaceum</i>)

Lewis, Dustin F.; Roten, Rory; Everman, Wesley J.; Gannon, Travis W.; Richardson, Robert J.; Yelverton, Fred H.

doi:10.1614/ws-d-12-00189.1

Cited by 11 publications

(40 citation statements)

References 12 publications

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“…Aminocyclopyrachlor is a pyrimidine carboxylic acid with similar efficacy to pyridine herbicides for weed control in grass crops. Recently, Lewis et al (2013a) reported no metabolism of aminocyclopyrachlor in tall fescue at 192 HAT. Similar results of minimal (<25%) metabolism in tolerant species have been noted with picloram and triclopyr in barley, rice, and wheat (Braverman, 1995; Radosevich and Bayer, 1979; Sharma and Born, 1973).…”

Section: Resultsmentioning

confidence: 99%

Dithiopyr Efficacy, Absorption, and Fate in Annual Bluegrass, Goosegrass, Smooth Crabgrass, and Tall Fescue

Barreda

Sidhu

et al. 2014

Agronomy Journal

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Dithiopyr provides pre-and early postemergence (POST) control of smooth crabgrass [Digitaria ischaemum (Schreb.) Schreb. ex Muhl] in tall fescue (Festuca arundinacea Schreb.), and may allow greater application exibility in spring than other herbicides. Dithiopyr also provides preemergence (PRE) control of annual bluegrass (Poa annua L.) and goosegrass [Eleusine indica (L.) Gaertn.], but POST applications are ine ective and may result from di erential physiological fate compared to smooth crabgrass. Experiments were conducted to investigate e cacy, absorption, distribution, and metabolism of dithiopyr in annual bluegrass, goosegrass, smooth crabgrass, and tall fescue. From seven dithiopyr rates, 1.18, 1.03, 0.76, and >4.48 kg a.i. ha -1 were required to reduce shoot mass 50% from the nontreated for annual bluegrass, goosegrass, smooth crabgrass, and tall fescue, respectively. In laboratory experiments, smooth crabgrass had ≈75% more kBq kg -1 following root absorption of 14 C-dithiopyr than annual bluegrass, goosegrass, and tall fescue a er 72 h. All species recovered >90% of foliar-absorbed 14 C in the treated leaf a er 72 h, with limited 14 C recovery (≤5%) in roots and nontreated shoots. Metabolism of dithiopyr increased from 1 to 7 d a er treatment (DAT) in all grasses. Final metabolism measured 69, 52, 33, and 27% of total 14 C recovered in smooth crabgrass, goosegrass, annual bluegrass, and tall fescue, respectively. Results suggest relative herbicide concentration and greater metabolism is associated with dithiopyr selectivity for POST control of smooth crabgrass compared to other grassy weeds in turf.

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Section: Resultsmentioning

confidence: 99%

Dithiopyr Efficacy, Absorption, and Fate in Annual Bluegrass, Goosegrass, Smooth Crabgrass, and Tall Fescue

Barreda

Sidhu

et al. 2014

Agronomy Journal

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“…Metabolites of 14 C‐aminocyclopyrachlor were also not observed in the species L. serriola, C. solstitialis and C. juncea (Bell et al ., ) via TLC. In addition, they were also not observed in L. arundinaceum via HPLC (Lewis et al ., ). Bell et al .…”

Section: Discussionmentioning

confidence: 97%

“…As with other auxinic herbicides, the translocation of aminocyclopyrachlor occurs through the phloem (Bukun et al ., ). The absorption, translocation and metabolism of aminocyclopyrachlor can vary according to the sensitivity of the target plant (Bukun et al ., ; Bell et al ., ; Guerra et al ., ; Lewis et al ., ). The absorption and translocation of aminocyclopyrachlor has been studied in different weed species including Lactuca serriola L. , Centaurea solstitialis L. , Chondrilla juncea L. (Bell et al ., ), Cirsium arvense L. (Bukun et al ., ), Tecoma stans (L.) Juss.…”

Section: Introductionmentioning

confidence: 97%

“…(Lym, ). The metabolism of aminocyclopyrachlor also has been studied in some weeds, including L. serriola, C. solstitialis, C. juncea (Bell et al ., ) and L. arundinaceum (Lewis et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…Darbysh. (Lewis et al ., ), Convolvulus arvensis L. (Lindenmayer et al ., ), Euphorbia ecsula L. and Linaria vulgaris P. Mill. (Lym, ).…”

Section: Introductionmentioning

confidence: 99%

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Absorption, translocation and metabolism of aminocyclopyrachlor in young plants of Ipomoea purpurea and Ipomoea triloba

Silva

Mendes

et al. 2018

Weed Research

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Members of the Convolvulaceae family are known to be sensitive to aminocyclopyrachlor, although little is known about the absorption, translocation and metabolism of the herbicide in these species of weed. The aim of this study was to evaluate the absorption, translocation and metabolism of 14 C-aminocyclopyrachlor in young plants of Ipomoea purpurea and Ipomoea triloba. Assessments were performed at 3, 6, 12, 24, 48 and 72 h after treatment (HAT) for the study of absorption and translocation. Metabolism was assessed at three time points (3, 24 and 72 HAT). In terms of absorption, was observed a difference between species at the 3 and 48 HAT time points, where I. purpurea had a higher absorption of 14 C-aminocyclopyrachlor. No differences were observed between species at any other time points. Of the total absorbed herbicide, 90.9% for I. purpurea and 91.8% for I. triloba were detected on the treated leaf. I. purpurea presented higher translocation to the leaf above the treated leaf, while I. triloba showed higher translocation to the lower leaves and roots. No increase in absorption of 14 C-aminocyclopyrachlor was observed above 24 HAT for I. purpurea and above 6 HAT for I. triloba, and translocation was low (<1%) for both species in all plant parts. This suggests that post-emergence application of aminocyclopyrachlor cannot be effective for the control of I. purpurea and I. triloba and alternative approaches are required. Nevertheless, no 14 C-aminocyclopyrachlor metabolites were observed in the studied plants, which indicated sensitivity in I. purpurea and I. triloba to the herbicide.

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Clopyralid Tolerance in Strawberry and Feasibility of Early Applications in Florida

Sharpe¹,

Boyd²,

Dittmar

et al. 2018

Weed Sci

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Broadleaf species escape current integrated weed management strategies in strawberry [Fragaria×ananassa (Weston) Duchesne ex Rozier (pro sp.) [chiloensis×virginiana]] production. Clopyralid is a registered POST control option, but current application timings provide suppression of only some species. Earlier clopyralid application timings may increase spray coverage to weeds at the planting hole, but strawberry plant tolerance to applications shortly after transplant is unknown. The objectives of the study were to determine the degree of clopyralid tolerance when applied to mature strawberry plants according to current management strategies, whether clopyralid absorption and translocation were involved in the tolerance response demonstrated by mature strawberry plants, and whether clopyralid could be safely applied to immature strawberry plants shortly after transplant. Clopyralid caused no damage when applied to mature strawberry plants and did not affect crop height, number of crowns, flowers, immature berries, or yield. Maximal strawberry absorption of radiolabeled clopyralid was 82% of the recovered radioactivity and reached peak (90%) absorption at 15 h. Maximal total translocation of radioactivity from the treated leaf was 17% and reached peak translocation at 52 h. Translocation was primarily to the new leaves and reproductive structures. In the early-application experiment, damage induced by clopyralid for all application timings reached 0 by 8 wk after treatment. Across all timings, maximal damage at 140 g ha−1was 17% when applied 14 d after transplant (DATr) and 56% at 28 g ha−1when applied at 21 DATr. Clopyralid dose did not affect the number of crowns, aboveground biomass, or yield. There was some stunting in plant height (3%) by the high labeled dose of clopyralid. Labeled dose clopyralid applications appear safe for application timings closer to strawberry transplant, though considerations of leaf cupping should be taken under consideration for label changes.

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Absorption, Translocation, and Metabolism of Aminocyclopyrachlor in Tall Fescue (Lolium arundinaceum)

Cited by 11 publications

References 12 publications

Dithiopyr Efficacy, Absorption, and Fate in Annual Bluegrass, Goosegrass, Smooth Crabgrass, and Tall Fescue

Dithiopyr Efficacy, Absorption, and Fate in Annual Bluegrass, Goosegrass, Smooth Crabgrass, and Tall Fescue

Absorption, translocation and metabolism of aminocyclopyrachlor in young plants of Ipomoea purpurea and Ipomoea triloba

Clopyralid Tolerance in Strawberry and Feasibility of Early Applications in Florida

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