Critical Period for Weed Control in Grafted and Nongrafted Watermelon Grown in Plasticulture

Bertucci, Matthew B.; Jennings, Katherine M.; Monks, David W.; Schultheis, Jonathan R.; Louws, Frank J.; Jordan, David L.; Brownie, Cavell

doi:10.1017/wsc.2018.76

Cited by 10 publications

(7 citation statements)

References 35 publications

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“…A 5% acceptable yield-loss threshold has been used in other crops to measure CTWC (Bertucci et al 2019b;Chaudhari et al 2016;Everman et al 2008). However, the choice of 5% is an arbitrary measurement of yield loss and can be altered on the basis of the economics of weed management or the risk that the farmer is willing to take (Knezevic et al 2002).…”

Section: Sweetpotato Yieldmentioning

confidence: 99%

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

et al. 2020

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Palmer amaranth is the most common and troublesome weed in North Carolina sweetpotato. Field studies were conducted in Clinton, NC, in 2016 and 2017 to determine the critical timing of Palmer amaranth removal in ‘Covington’ sweetpotato. Palmer amaranth was grown with sweetpotato from transplanting to 2, 3, 4, 5, 6, 7, 8, and 9 wk after transplanting (WAP) and maintained weed-free for the remainder of the season. Palmer amaranth height and shoot dry biomass increased as Palmer amaranth removal was delayed. Season-long competition by Palmer amaranth interference reduced marketable yields by 85% and 95% in 2016 and 2017, respectively. Sweetpotato yield loss displayed a strong inverse linear relationship with Palmer amaranth height. A 0.6% and 0.4% decrease in yield was observed for every centimeter of Palmer amaranth growth in 2016 and 2017, respectively. The critical timing for Palmer amaranth removal, based on 5% loss of marketable yield, was determined by fitting a log-logistic model to the relative yield data and was determined to be 2 WAP. These results show that Palmer amaranth is highly competitive with sweetpotato and should be managed as early as possible in the season. The requirement of an early critical timing of weed removal to prevent yield loss emphasizes the importance of early-season scouting and Palmer amaranth removal in sweetpotato fields. Any delay in removal can result in substantial yield reductions and fewer premium quality roots.

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Section: Sweetpotato Yieldmentioning

confidence: 99%

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

et al. 2020

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“…), tomato (Solanum lycopersicum L.), and watermelon [Citrullus lanatus (Thunb.) Matsum & Nakai] (Aulakh et al 2011(Aulakh et al , 2012(Aulakh et al , 2013Bertucci et al 2019;Burke et al 2007;Chahal et al 2017;Garvey et al 2013;Grichar 1997;Mayers et al 2010;Mohseni-Moghadam et al 2013;Moore et al 2004;Nerson 1989;Norsworthy et al 2008;Price et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Multiple herbicide-resistant Palmer amaranth (Amaranthus palmeri) in Connecticut: confirmation and response to POST herbicides

Aulakh

Chahal²,

Kumar

et al. 2021

Weed Technol

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Palmer amaranth is the latest pigweed species documented in Connecticut in 2019. In a single dose experiment, the Connecticut Palmer amaranth biotype survived the field–use rates of glyphosate (840 g ae ha-1) and imazaquin (137 g ai ha-1) herbicides applied separately. Additional experiments were conducted to (1) determine the level of resistance to glyphosate and acetolactate synthase (ALS) inhibitors in the Connecticut–resistant (CT–Res) biotype using whole-plant dose-response bioassays, and (2) evaluate the response of the CT–Res biotype to POST herbicides commonly used in CT cropping systems. Based on the effective dose required for 90% control (ED90), the CT–Res biotype was 10–fold resistant to glyphosate when compared with the Kansas– susceptible (KS–Sus) biotype. Furthermore, the CT–Res biotype was highly resistant to ALS–inhibitor herbicides with only 18% control with 2,196 g ai ha-1 of imazaquin. It was also cross resistant to other ALS–inhibitor herbicides including: chlorimuron–ethyl (13.1 g ai ha-1), halosulfuron–methyl (70 g ai ha-1), and sulfometuron–methyl (392 g ai ha-1). The CT–Res Palmer amaranth was controlled 75 to 100% at 21 d after treatment (DAT) with POST applications of 2, 4–D (386 g ae ha-1), carfentrazone–ethyl (34 g ai ha-1), clopyralid (280 g ae ha-1), dicamba (280 g ae ha-1), glufosinate (595 g ai ha-1), lactofen (220 g ai ha-1), oxyfluorfen (1,121g ai ha-1), and mesotrione (105 g ai ha-1) herbicides. Atrazine (2,240 g ai ha-1) controlled the CT–Res biotype only 52%, suggesting the biotype is resistant to this herbicide as well. This research reports the first case of Palmer amaranth from Connecticut with multiple resistance to glyphosate and ALS–inhibitors. Growers should proactively use all available weed control tactics, including the use of effective PRE and alternative POST herbicides (tested in this study) for effective control of the CT–Res biotype.

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“…Watermelon (Citrullus lanatus) production is economically important to the southern United States including Florida, Texas, and Georgia as well as other countries throughout the world [1][2][3]. Biotic constraints such as the vascular wilt disease caused by Fusarium oxysporum f.sp.…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic and phenotypic characterization of Fusarium oxysporum f. sp. niveum isolates from Florida-grown watermelon

et al. 2021

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Fusarium wilt of watermelon (Citrullus lanatus) caused by Fusarium oxysporum f. sp. niveum (Fon), has become an increasing concern of farmers in the southeastern USA, especially in Florida. Management of this disease, most often through the use of resistant cultivars and crop rotation, requires an accurate understanding of an area’s pathogen population structure and phenotypic characteristics. This study improved the understanding of the state’s pathogen population by completing multilocus sequence analysis (MLSA) of two housekeeping genes (BT and TEF) and two loci (ITS and IGS), aggressiveness and race-determining bioassays on 72 isolates collected between 2011 and 2015 from major watermelon production areas in North, Central, and South Florida. Multilocus sequence analysis (MLSA) failed to group race 3 isolates into a single large clade; moreover, clade membership was not apparently correlated with aggressiveness (which varied both within and between clades), and only slightly with sampling location. The failure of multilocus sequence analysis using four highly conserved housekeeping genes and loci to clearly group and delineate known Fon races provides justification for future whole genome sequencing efforts whose more robust genomic comparisons will provide higher resolution of intra-species genetic distinctions. Consequently, these results suggest that identification of Fon isolates by race determination alone may fail to detect economically important phenotypic characteristics such as aggressiveness leading to inaccurate risk assessment.

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Critical Period for Weed Control in Grafted and Nongrafted Watermelon Grown in Plasticulture

Cited by 10 publications

References 35 publications

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

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

Multiple herbicide-resistant Palmer amaranth (Amaranthus palmeri) in Connecticut: confirmation and response to POST herbicides

Phylogenetic and phenotypic characterization of Fusarium oxysporum f. sp. niveum isolates from Florida-grown watermelon

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