Critical timing of Palmer amaranth (<i>Amaranthus palmeri</i>) removal in sweetpotato

Smith, Stephen C.; Jennings, Katherine M.; Monks, David W.; Chaudhari, Sushila; Schultheis, Jonathan R.; Reberg‐Horton, S. Chris

doi:10.1017/wet.2020.1

Cited by 17 publications

(20 citation statements)

References 33 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…emerged between the 13 and 27 DAP ratings, with greater abundance in diquat-only plots. Palmer amaranth has been reported to greatly reduce sweetpotato yield (Basinger et al 2019;Meyers et al 2010;Smith et al 2020), and its timing of emergence in this study occurred during the critical period for weed control of 2 to 6 WAP (Seem et al 2003;Smith et al in press).…”

Section: Treatment Bmentioning

confidence: 63%

Response of sweetpotato to diquat applied pretransplanting

et al. 2020

Self Cite

View full text Add to dashboard Cite

Field trials were conducted in North Carolina in 2017 and Louisiana and Mississippi in 2018 to determine the effect of pretransplanting applications of diquat on sweetpotato crop tolerance, yield, and storage root quality. In North Carolina treatments consisted of two rates of diquat (560 or 1,120 g ai ha−1) alone or mixed with 107 g ai ha−1 flumioxazin and applied 1 d before transplanting (DBP), sequential applications of diquat (560 or 1,120 g ha−1) 1 and 17 DBP, 107 g ha−1 flumioxazin alone, and a nontreated check. In Louisiana and Mississippi treatments consisted of diquat (560 or 1,120 g ha−1) applied 1 DBP either alone or followed by (fb) rehipping rows or 107 g ha−1 flumioxazin immediately prior to transplanting. Additional treatments included 546 g ha−1 paraquat applied 1 DBP and a nontreated check. In North Carolina injury was ≤3% for all treatments through 23 d after transplanting (DAP), and no injury was observed after 23 DAP. Visual sweetpotato stunting pooled across the Mississippi and Louisiana trials ranged from 1% to 14%, 0% to 6%, and 0% to 3% at 2, 4, and 6 wk after planting (WAP), respectively, and no crop injury was observed after 6 WAP. Diquat applied 1 DBP and not fb rehipping resulted in greater crop injury (12%) than comparable treatments that were rehipped (2%). In North Carolina single and sequential diquat applications resulted in reduced No. 1 sweetpotato yield (24,230 and 24,280 kg ha−1, respectively) compared with the nontreated check, but No. 1 yield when diquat plus flumioxazin (26,330 kg ha−1) was used was similar to that of the nontreated check. No. 1 yield did not differ by treatment in Louisiana and Mississippi.

show abstract

Section: Treatment Bmentioning

confidence: 63%

Response of sweetpotato to diquat applied pretransplanting

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Palmer amaranth is the most problematic weed in sweetpotato (Smith and Moore unpublished data;Webster 2010). Palmer amaranth can reduce marketable sweetpotato yield 80% to 95% if left uncontrolled (Barkley et al 2016;Basinger et al 2019;Meyers et al 2010a;Smith et al 2020). These yield reductions are factors of vigorous growth of Palmer amaranth (Horak and Loughin 2000;Meyers et al 2010a;Sellers et al 2003), high fecundity (Keeley et al 1987;Sellers et al 2003;Sosnoskie et al 2014), and resistance to many previously efficacious herbicidal modes of action (Heap 2020).…”

Section: Introductionmentioning

confidence: 99%

Safety and efficacy of linuron with or without an adjuvant or S-metolachlor for POST control of Palmer amaranth (Amaranthus palmeri) in sweetpotato

et al. 2021

Self Cite

View full text Add to dashboard Cite

Field studies were conducted to evaluate linuron for POST control of Palmer amaranth in sweetpotato to minimize reliance on protoporphyrinogen oxidase (PPO)-inhibiting herbicides. Treatments were arranged in a two by four factorial where the first factor consisted of two rates of linuron (420 and 700 g ai ha−1), and the second factor consisted of linuron applied alone or in combinations of linuron plus a nonionic surfactant (NIS) (0.5% v/v), linuron plus S-metolachlor (800 g ai ha−1), or linuron plus NIS plus S-metolachlor. In addition, S-metolachlor alone and nontreated weedy and weed-free checks were included for comparison. Treatments were applied to ‘Covington’ sweetpotato 8 d after transplanting (DAP). S-metolachlor alone provided poor Palmer amaranth control because emergence had occurred at applications. All treatments that included linuron resulted in at least 98 and 91% Palmer amaranth control 1 and 2 wk after treatment (WAT), respectively. Including NIS with linuron did not increase Palmer amaranth control compared to linuron alone, but increased sweetpotato injury and subsequently decreased total sweetpotato yield by 25%. Including S-metolachlor with linuron resulted in the greatest Palmer amaranth control 4 WAT, but increased crop foliar injury to 36% 1 WAT compared to 17% foliar injury from linuron alone. Marketable and total sweetpotato yield was similar between linuron alone and linuron plus S-metolachlor or S-metolachlor plus NIS treatments, though all treatments resulted in at least 39% less total yield than the weed-free check resulting from herbicide injury and/or Palmer amaranth competition. Because of the excellent POST Palmer amaranth control from linuron 1 WAT, a system including linuron applied 7 DAP followed by S-metolachlor applied 14 DAP could help to extend residual Palmer amaranth control further into the critical period of weed control while minimizing sweetpotato injury.

show abstract

“…Meyers and Shankle (2015) reported that yellow nutsedge densities of 5 to 90 shoots m −2 in planted sweetpotato resulted in yield losses of 18-96%. Smith et al (2020) reported that Palmer amaranth, when not controlled, reduced 'Covington' marketable sweetpotato yield by 95% after season-long interference.…”

Section: Introductionmentioning

confidence: 99%

“…sweetpotato resulted in yield losses of 18-96%. Smith et al (2020) reported that Palmer amaranth, when not controlled, reduced 'Covington' marketable sweetpotato yield by 95% after season-long interference.…”

mentioning

confidence: 99%

Impact of tank mixing plant hormones with bentazon and mesotrione on sweetpotato injury and weed control

Caputo

Wadl

McCarty

et al. 2021

Agrosystems Geosci & Env

View full text Add to dashboard Cite

Due to excessive crop damage, currently, there are no selective postemergent (POST) herbicides registered for sweetpotato [Ipomoea batatas (L.) Lam] to control broadleaves and nutsedge species. Expansion of bentazon and mesotrione herbicide labels to include sweetpotato would be beneficial for growers. Two experiments were conducted. The first evaluated the dose response of sweetpotato cultivars Beauregard and Covington to bentazon (514, 1,028, and 1,542, g a.i. ha -1 ) and mesotrione (105, 210, and 315 g a.i. ha -1 ) when melatonin, 24-epibrassinolide, or ascorbic acid (AsA) were included in the tank mix. The second experiment evaluated the efficiency of bentazon and mesotrione for control of yellow nutsedge (Cyperus esculentus L.) and Palmer amaranth (Amaranthus palmeri S. Wats.), when different doses of melatonin, 24-epibrassinolide, or AsA were added to each herbicide. In the first experiment, when treated with herbicide alone, Beauregard exhibited injury levels lower than Covington for both herbicides. No injury was observed when plants were treated with plant hormones or AsA alone. At the lowest dose of bentazon and mesotrione, the addition of AsA or plant hormones in the tank mix significantly reduced percentage injury and increased plant tolerance, requiring higher doses of herbicide to cause 10, 20, and 30% injury. In the second experiment, the addition of plant hormones and AsA in the tank mix had no antagonistic effect on herbicide effectiveness, exhibiting similar levels of injuries as herbicides application alone. These results suggest that the use of plant hormones and AsA could improve sweetpotato tolerance to POST applications of bentazon and mesotrione without reducing herbicide effectiveness. INTRODUCTIONSweetpotato [Ipomoea batatas (L.) Lam] production in the United States has increased by 37.6% from 2012 to 2017, reaching an estimated value of US$654 million in 2018 (USDA,

show abstract

Critical timing of Palmer amaranth (Amaranthus palmeri) removal in sweetpotato

Cited by 17 publications

References 33 publications

Response of sweetpotato to diquat applied pretransplanting

Response of sweetpotato to diquat applied pretransplanting

Safety and efficacy of linuron with or without an adjuvant or S-metolachlor for POST control of Palmer amaranth (Amaranthus palmeri) in sweetpotato

Impact of tank mixing plant hormones with bentazon and mesotrione on sweetpotato injury and weed control

Contact Info

Product

Resources

About