Sweetpotato Tolerance to Halosulfuron Applied Postemergence

Macrae, Andrew; Monks, David W.; Batts, Roger B.; Thorton, Allan C.; Schultheis, Jonathan R.

doi:10.1614/wt-060178.1

Cited by 9 publications

(13 citation statements)

References 15 publications

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“…& Nakai], and tomato (Lycopersicon esculentum Mill.) in the United States (Brandenberger et al 2005;Dittmar et al 2008;Felix and Newberry 2012;Mullinix 2002 2005;MacRae et al 2007MacRae et al , 2008Webster and Culpepper 2005).…”

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confidence: 99%

Halosulfuron Reduced Purple Nutsedge (Cyperus rotundus) Tuber Production and Viability

Webster

Grey

2014

Weed sci.

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Weeds persist and cause economic losses in agricultural systems because they exploit underused portions of that system. Reducing the effect of weeds on agroecosystems begins with minimizing the number of propagules (e.g., seeds and tubers) that are produced and returned to the soil. Purple nutsedge is a problematic weed around the globe, persisting between growing seasons as tubers in the soil. Halosulfuron is an effective herbicide for controlling purple nutsedge foliage and is used in corn and several vegetable crops. Studies were conducted to evaluate the effect of various rates of halosulfuron on purple nutsedge tuber production. Single, presprouted purple nutsedge tubers were transplanted into outdoor microplots and treated after 6 wk of growth with six rates of halosulfuron (7 to 208 g ai ha−1) POST with a nontreated control (NTC). All shoots that had emerged at the time of application were marked with plastic rings; this allowed for classification of tubers at exhumation of (1) tubers attached to shoots that had emerged by the time of application, (2) tubers attached to shoots that emerged after application, and (3) tubers without an aerial shoot during the study. Seven weeks after application, the tubers in the microplots were exhumed and tubers were classified, quantified, and their ability to sprout was evaluated. In the NTC, there were 530 total tubers, with a log-logistic regression model describing the tuber population with increasing halosulfuron rate. The rate of halosulfuron that reduced total tuber population 50% (I50) was 8 g ha−1. In the NTC, 200 tubers were attached to shoots that emerged following halosulfuron application, and this class of tubers had anI50of 19 g ha−1. Viability of tubers with shoots that emerged following halosulfuron application was 28% at the 52 g ha−1halosulfuron, suggesting the action of the herbicide may have rendered the tuber nonviable after new shoots were produced. The final classification of tubers was those that did not have an aerial shoot during the study. These were tubers in which apical dominance suppressed shoot development or were likely the most-recent tubers to develop. Of the three classes, the tubers without shoots were the most numerous in the NTC, with 294 tubers and anI50of 1 g ha−1. Halosulfuron is an effective herbicide that not only controls purple nutsedge foliage but also reduces the number of new tubers produced and overall tuber viability. This could be an important component to reduce the long-term population density of the weed.

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Halosulfuron Reduced Purple Nutsedge (Cyperus rotundus) Tuber Production and Viability

Webster

Grey

2014

Weed sci.

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“…Sweetpotato tolerance to POST applications of thifensulfuron (MacRae et al 2007a) and trifloxysulfuron (MacRae et al 2005) increased as application timing was delayed from 1 to 8 WAP. Similarly, MacRae et al (2007b) reported that halosulfuron-methyl applications at 4 WAP did not reduce no. 1 or total yields of Beauregard and ‘Hernandez’ sweetpotato.…”

Section: Resultsmentioning

confidence: 90%

Sweetpotato Response to Simulated Glyphosate Wick Drip

2017

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Field studies were conducted in 2009 at Clinton, NC and 2014 at Pontotoc, MS to determine the influence of simulated glyphosate drip on sweetpotato yield and quality. Treatments consisted of three glyphosate solution (140 g ae L -1 ) drip volumes (0.16, 0.32 and 0.48 ml) by four application timings [(4 wk after transplanting (WAP); 6 WAP; 8 WAP; and 4 WAP followed by (fb) 6 WAP fb 8 WAP]. A non-treated check was included for comparison. Visual sweetpotato injury consisted of chlorosis at the shoot tips approximately 1 wk after treatment fb necrosis and stunting. At 6 WAP and 8 WAP, sweetpotato injury following glyphosate applied 4 WAP was 71 and 65%, respectively. Injury from glyphosate applied 4 WAP fb 6 WAP was 78%. Injury from glyphosate applied 6 WAP was 26% at 8 WAP. In 2009, jumbo, no. 1, canner, and marketable yield of the non-treated check were two to three times greater than glyphosate treatments (0.16, 0.32, 0.48 ml). Likewise, yield of the non-treated check was substantially greater than those treated with 0.16 to 0.48 ml glyphosate solution in 2014. In 2009 and 2014, sweetpotato yield of all grades increased as glyphosate application timing was delayed. In 2009, no. 1 yield from glyphosate 8 WAP (8,210 kg ha -1 ) was similar to the non-treated check. In 2009, there were no cracked storage roots in the non-treated check. However, sweetpotatoes receiving 0.16 to 0.48 ml glyphosate solution displayed 8 to 17%, 11 to 18%, 5 to 13%, and 11 to 16% cracking (by weight) in jumbo, no. 1, canner, and marketable storage roots, respectively. Compared to the non-treated check, glyphosate applied 4 WAP, 6 WAP, or 4 WAP fb 6 WAP fb 8 WAP had a greater percentage of cracked marketable sweetpotato storage roots. Nomenclature: Glyphosate; sweetpotato, Ipomoea batatas L. Lam. Key words: Root cracking, off-target, storage root.Estudios de campo fueron realizados en 2009 en Clinton, North Carolina y en 2014 en Pontotoc, Mississippi para determinar la influencia de goteo simulado con glyphosate sobre el rendimiento y la calidad de la batata. Los tratamientos consistieron de tres volúmenes de goteo (0.16, 0.32, y 0.48 ml) de solución de glyphosate (140 g ae L −1 ) y cuatro momentos de aplicación [4 semanas después del trasplante (WAP); 6 WAP; 8 WAP; y 4 WAP seguido por (fb) 6 WAP fb 8 WAP]. Un testigo sin tratamiento fue incluido para fines de comparación. El daño visualmente estimado de la batata consistió de clorosis en los ápices del tejido aéreo de la batata aproximadamente 1 semana después del tratamiento fb necrosis y crecimiento atrofiado. A 6 WAP y 8 WAP, el daño en la batata después de la aplicación de glyphosate 4 WAP fue 71 y 65%, respectivamente. El daño causado por glyphosate aplicado 4 WAP fb 6 WAP fue 78%. El daño con glyphosate aplicado 6 WAP fue 26% a 8 WAP. En 2009, los rendimientos jumbo, no. 1, canner, y comercializable del testigo sin tratamiento fueron dos a tres veces mayores que los tratamientos con glyphosate (0.16, 0.32, y 0.48 ml). De la misma manera, el rendimiento del testigo sin tratamiento fu...

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“…The current rotational restriction for rimsulfuron/thifensulfuron is 1.5 and 18 mo for rates of up to 18/18 g ha -1 and between 18/18 to 32/32 g ha -1 , respectively (Anonymous 2017a). Acetolactate synthase-inhibitor herbicides have been investigated for use in sweetpotato, but the vast majority of investigations have focused on broadcast applications made over the top of the crop after transplanting (Dittmar et al 2013;MacRae et al 2007aMacRae et al , 2007bMeyers and Shankle 2016). Published research results reporting sweetpotato tolerance to rimsulfuron and thifensulfuron-methyl are limited.…”

Section: Introductionmentioning

confidence: 99%

Sweetpotato tolerance to saflufenacil and rimsulfuron/thifensulfuron-methyl applied pretransplanting

Meyers

Shankle

Garrett³

2019

Weed Technol

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Field studies were conducted at the Pontotoc Ridge–Flatwoods Branch Experiment Station in Pontotoc, MS, in 2016 and 2017 to determine sweetpotato crop response to saflufenacil and rimsulfuron/thifensulfuron-methyl. Saflufenacil treatments consisted of a factorial of two rates (25 or 50 g ai ha–1) by three application timings [0, 3, or 6 wk before transplanting (WBP)]. Rimsulfuron/thifensulfuron-methyl treatments consisted of a factorial of two rates (18/18 or 35/35 g ai ha–1) by two application timings (3 or 6 WBP). A nontreated check was included for comparison. Saflufenacil resulted in as much as 20% stunting injury in 2016, but ≤4% crop injury in 2017. Compared to the nontreated check, saflufenacil did not reduce yield of any sweetpotato grade regardless of application rate or timing. Findings from this trial indicate that saflufenacil applied in pre-transplanting burndown and field preparation procedures did not have a negative impact on the subsequent sweetpotato crop and that the current plant-back interval (4 to 5 mo) may be excessive. Applications of rimsulfuron/thifensulfuron-methyl at 35/35 g ha–1 made 3 WBP resulted in significant crop injury but did not reduce yield of any sweetpotato grade. Findings from this trial suggest that rimsulfuron/thifensulfuron-methyl applications up to 35/35 g ha–1 applied at least 6 WBP and 18/18 g ha–1 applied at least 3 WBP had little impact on sweetpotato crop growth and may be a safe preplant burndown option.

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Sweetpotato Tolerance to Halosulfuron Applied Postemergence

Cited by 9 publications

References 15 publications

Halosulfuron Reduced Purple Nutsedge (Cyperus rotundus) Tuber Production and Viability

Halosulfuron Reduced Purple Nutsedge (Cyperus rotundus) Tuber Production and Viability

Sweetpotato Response to Simulated Glyphosate Wick Drip

Sweetpotato tolerance to saflufenacil and rimsulfuron/thifensulfuron-methyl applied pretransplanting

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