Fomesafen Programs for Palmer Amaranth (<i>Amaranthus palmeri</i>) Control in Sweetpotato

Barkley, Susan L.; Chaudhari, Sushila; Jennings, Katherine M.; Schultheis, Jonathan R.; Meyers, Stephen L.; Monks, David W.

doi:10.1614/wt-d-15-00150.1

Cited by 21 publications

(22 citation statements)

References 19 publications

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“…However, S -metolachlor applied too soon after transplanting and followed by heavy rains can cause injury to the storage root (shortening, rounding) (Meyers et al 2013). Clomazone and napropamide are also registered for PRE application in sweetpotato but provide inconsistent control of Palmer amaranth and other pigweed species (Barkley et al 2016; Scott et al 1995).…”

Section: Introductionmentioning

confidence: 99%

“…The tolerance of sweetpotato to herbicides has been reported to be dependent on the rate, application timing, cultivar, and environmental conditions (Barkley et al 2016; Meyers et al 2010b; Meyers et al 2012). Differences in cultivar tolerance to S -metolachlor, metribuzin, and bentazon have been reported in sweetpotato (Harrison et al 1985; Meyers et al 2012; Motsenbocker and Monaco 1991).…”

Section: Introductionmentioning

confidence: 99%

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Response of Sweetpotato Cultivars to Linuron Rate and Application Time

Beam

Jennings

Chaudhari³

et al. 2018

Weed Technol

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Field studies were conducted in 2015 and 2016 in North Carolina to determine the response of ‘Covington’ and ‘Murasaki-29’ sweetpotato cultivars to four rates of linuron (420, 560, 840, and 1,120 g ai ha–1) alone or withS-metolachlor (803 g ai ha–1) applied 7 or 14 d after transplanting (DAP). Injury (chlorosis/necrosis and stunting) to both cultivars was greater when linuron was applied withS-metolachlor as compared to linuron applied alone. Herbicide application at 14 DAP caused greater injury (chlorosis/necrosis and stunting) to both cultivars than when applied at 7 DAP. At 4 wk after treatment (WAT), stunting of Covington and Murasaki-29 (hereafter Murasaki) from linuron at 420 to 1,120 g ha–1increased from 27% to 50% and 25% to 53%, respectively. At 7 or 8 WAT, crop stunting of 8% or less and 0% was observed in Covington and Murasaki, respectively, regardless of application rate and timing. Murasaki root yields were similar in the linuron alone or withS-metolachlor treatments, and were lower than the nontreated check. In 2016, no. 1 and marketable sweetpotato yields of Covington were similar for the nontreated check, linuron alone, or linuron plusS-metolachlor treatments, but not in 2015. Decreases in no. 1 and marketable root yields were observed when herbicides were applied 14 DAP compared to 7 DAP for Covington in 2015 and for Murasaki in both years. No. 1 and marketable yields of Covington were similar for 420 to 1,120 g ha–1linuron and nontreated check except marketable root yields in 2015. No. 1 and marketable sweetpotato yields of Murasaki decreased as application rates increased.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Response of Sweetpotato Cultivars to Linuron Rate and Application Time

Beam

Jennings

Chaudhari³

et al. 2018

Weed Technol

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“…Sweetpotato yield, quality, and subsequent value can be negatively affected by weeds (Barkley et al 2016; Coleman et al 2016; Meyers et al 2010b). Although cultivation, mowing, and hand-weeding are important weed management practices in sweetpotato production, herbicides are the major component of a weed management program in sweetpotato (J. Haley and J. Curtis, unpublished data).…”

Section: Introductionmentioning

confidence: 99%

“…Clomazone and napropamide are also registered for use before or after transplant prior to weed emergence in sweetpotato. However, control of Palmer amaranth ( Amaranthus palmeri S. Watson) and other pigweed species is not consistent with clomazone and napropamide (Barkley et al 2016; Scott et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Response of Sweetpotato to Oryzalin Application Rate and Timing

Chaudhari

Jennings

Meyers³

2018

Weed Technol

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The investigation of potential herbicides for weed control in sweetpotato is critical due to the limited number of registered herbicides and the development of populations of herbicide- resistant weeds. Therefore, field studies were conducted at the Horticultural Crops Research Station, Clinton, NC and the Pontotoc Ridge–Flatwoods Branch Experiment Station, Pontotoc, MS to determine the effect of oryzalin application rate and timing on sweetpotato tolerance. Oryzalin at 0.6, 1.1, 2.2, 3.4, and 4.5 kg ai ha–1was applied immediately after transplanting or 14 d after sweetpotato transplanting (DAP). At Clinton, oryzalin applied immediately after transplanting resulted in ≤1% leaf distortion 4 and 6 wk after transplanting (WAP) regardless of application rate. However, when oryzalin was applied 14 DAP, greater sweetpotato leaf distortion was observed from 2.2, 3.4, and 4.5 kg ha–1(≤8%) than 0.6 and 1.1 kg ha–1(≤4%). At Pontotoc, oryzalin applied immediately after transplanting resulted in ≤6% leaf distortion 4 WAP regardless of application rate. However, when oryzalin was applied at 14 DAP, greater leaf distortion was reported from 3.4 and 4.5 kg ha–1(11 to 13%) than 0.6, 1.1, and 2.2 kg ha–1(4 to 6%). Oryzalin application rate and timing did not affect yield of no.1, jumbo, or marketable sweetpotato. Based on these results, oryzalin herbicide has potential for registration in sweetpotato.

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“…Sweetpotato producers control weeds through the use of PRE, cultivation, mowing, and hand removal (J. Haley and J. Curtis, unpublished data). PRE herbicides flumioxazin, clomazone, and S -metolachlor can provide excellent residual weed control (Barkley et al 2016; Meyers et al 2013a) but require rainfall or irrigation for activation, and weed control can be compromised if the soil surface is disturbed after application. In North Carolina, growers have some reluctance to use S -metolachlor because of the possibility of decreased yield and negative effects on storage root shape when herbicide application occurs just after transplanting and followed by moderate to heavy rainfall (Meyers et al 2010, 2012, 2013a, 2013b; Monks et al 2013).…”

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Sweetpotato Tolerance and Palmer Amaranth Control with Metribuzin and Oryzalin

2017

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Field studies were conducted in Clinton, NC in 2007 and 2009 to determine sweetpotato crop response and Palmer amaranth control with metribuzin and oryzalin. Treatments consisted of 140 and 202 g ai ha−1metribuzin applied immediately after transplanting [0 wk after transplanting (WAP)] or 2 WAP, 560 and 1121 g ha−1oryzalin 0 WAP, and tank mixes of metribuzin (140 or 202 g ha−1) and oryzalin (560 or 1,121 g ha−1) 0 WAP. At 2 WAP, metribuzin alone applied 0 WAP resulted in greater crop injury (33%) than oryzalin alone (1%), and the tank mix of metribuzin plus oryzalin resulted in greater crop injury (49%) than either herbicide applied alone. Greater crop injury occurred when metribuzin was applied at 202 g ha−1(54%) than 140 g ha−1(34%). Levels of injury were similar at 4 WAP (34, 8, and 52% for metribuzin, oryzalin, and the tank mix, respectively). At 4 WAP, injury from metribuzin was greater when it was applied 0 WAP (34%) compared to 2 WAP (18%). By 10 WAP, injury from metribuzin applied at 2 WAP was only 4%. At 4 WAP, Palmer amaranth control was excellent for all treatments and ≥98%. At 10 WAP, control among treatments ranged from 77% to 85%. Palmer amaranth control provided by metribuzin was similar for applications made 0 WAP (78%) and 2 WAP (77%). Oryzalin alone provided similar control (85%) to metribuzin alone 0 WAP, but greater control than the tank mix (77%). Neither metribuzin nor oryzalin rate differed in weed control provided at 10 WAP. Oryzalin 0 WAP and metribuzin 2 WAP provided no. 1 sweetpotato yields equivalent to the hand-weeded check. No. 1 yields of all other treatments were less than the hand-weeded check but greater than the weedy check.

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Fomesafen Programs for Palmer Amaranth (Amaranthus palmeri) Control in Sweetpotato

Cited by 21 publications

References 19 publications

Response of Sweetpotato Cultivars to Linuron Rate and Application Time

Response of Sweetpotato Cultivars to Linuron Rate and Application Time

Response of Sweetpotato to Oryzalin Application Rate and Timing

Sweetpotato Tolerance and Palmer Amaranth Control with Metribuzin and Oryzalin

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