Effect of row spacing and herbicide programs for control of glyphosate-resistant Palmer amaranth (<i>Amaranthus palmeri</i>) in dicamba/glyphosate-resistant soybean

McDonald, Shawn T.; Striegel, Adam; Chahal, Parminder S.; Jha, Prashant; Rees, Jennifer; Proctor, Christopher A.; Jhala, Amit J.

doi:10.1017/wet.2021.36

Cited by 7 publications

(8 citation statements)

References 55 publications

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“…Since 2017, XtendFlex crop varieties with traits conferring resistance to dicamba (3,6‐dichloro‐2‐methoxybenzoic acid) plus glyphosate ( N ‐[phosphonomethyl] glycine) have been commercialized for cotton, corn, and soybean (Allen et al., 2021). This newer herbicide‐resistant crop technology allows the application of dicamba formulations alone or in combination with glyphosate in cotton, corn, and soybean, and their adoption is increasing (McDonald et al., 2021). Currently, XtendFlex cotton, corn, and soybean varieties are widely adopted in the southeastern United States, with dicamba regularly applied in combination with glyphosate to control problematic weed species, including Palmer amaranth ( Amaranthus palmeri S. Watson) and to broaden the weed control spectrum including grasses (Blanchett et al., 2015; Leon et al., 2014).…”

Section: Introductionmentioning

confidence: 99%

Response of peanut (Arachis hypogaea L.) to sublethal rates of dicamba plus glyphosate at different growth stages

et al. 2023

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The widespread adoption of dicamba-resistant crops has increased the applications of newer dicamba formulations for weed control. However, there is a concern for potential off-target injury and yield reduction to peanuts (Arachis hypogea L.) planted in close proximity to dicamba-resistant crops. Field experiments were conducted in the summer of 2019 and 2020 to evaluate peanut response to reduced rates (1/512X, 1/128X, 1/32X, and 1/8X the label rate, 564 + 1280 g ae ha −1 ) of dicamba plus glyphosate (XtendiMax plus Roundup PowerMax) at 25, 50, and 75 days after planting (DAP) which corresponds to vegetative, flowering, and pod development stages, respectively. Peanut exposure to dicamba plus glyphosate at 25 DAP resulted in 1.6-2.3 times greater injury and 3.4-8.5 times greater height and canopy width reductions compared to 50 and 75 DAP exposures. Peanuts suffered greater yield reduction (18%-19%) when exposed to dicamba plus glyphosate at 25 and 75 DAP than at 50 DAP (10%). Regression analysis indicated a significant linear response for peanut injury (except at 8 weeks after treatment), canopy width reduction, and yield reduction with an increasing rate of dicamba plus glyphosate. Dicamba plus glyphosate at 1/512X rate resulted in a 3% peanut yield reduction, whereas a 41% yield reduction was observed at 1/8X rate. Correlation analysis, with Pearson's rho values ranging from 0.81 to 0.86, showed that peanut injury can be a useful predictor for estimating yield reduction. Therefore, extreme care must be taken to prevent drift occurrence or spray-tank contamination when applying dicamba plus glyphosate on XtendFlex crops near peanut fields. INTRODUCTIONPeanut (Arachis hypogaea L.) is one of the major agronomic crops in the southeastern United States. In 2020, peanut was planted on 673,477 ha with 2.8 million metric tons of production, resulting in a total market value Abbreviations: DAP, days after planting; VGT, vapor grip technology; WAP, weeks after planting; WAT, weeks after treatment.

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Section: Introductionmentioning

confidence: 99%

Response of peanut (Arachis hypogaea L.) to sublethal rates of dicamba plus glyphosate at different growth stages

et al. 2023

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“…Results of the meta-analysis indicate that the benefits of narrow row spacing may likely be achieved with PRE fb POST herbicide application compared with PRE or POST-only or POST fb POST herbicide application, as weed densities may be high due to emergence during the early season (in the case of POST-only, and POST fb POST) or resurgence (in the case of PRE-only) during the late season. For example, McDonald et al (2021) reported 3 to 32 versus 123 to 497 plants m −2 of A. palmeri with PRE fb POST versus POST-only herbicide programs in a soybean row-spacing study conducted in Nebraska. However, the weed density data set had only one study each for PRE (Johnson and Hoverstad 2002) and POST fb POST herbicide application (McDonald et al 2021); therefore, no definitive conclusion could be drawn.…”

Section: Resultsmentioning

confidence: 99%

“…For example, McDonald et al (2021) reported 3 to 32 versus 123 to 497 plants m −2 of A. palmeri with PRE fb POST versus POST-only herbicide programs in a soybean row-spacing study conducted in Nebraska. However, the weed density data set had only one study each for PRE (Johnson and Hoverstad 2002) and POST fb POST herbicide application (McDonald et al 2021); therefore, no definitive conclusion could be drawn.…”

Section: Resultsmentioning

confidence: 99%

Does narrow row spacing suppress weeds and increase yields in corn and soybean? A meta-analysis

Singh,

Thapa,

Singh

et al. 2023

Weed Sci

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Narrow row spacing (< 76 cm) could improve crop competitiveness, suppress weeds, and may provide yield advantage. Many studies have been conducted to evaluate the impact of narrow row spacing; however, no quantitative synthesis of these studies exists. The objectives of this meta-analysis were to (i) quantify the overall effect of narrow row spacing (< 76 cm) on weed density, biomass, control, weed seed production, and yield in corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] compared with 76 cm row spacing, and (ii) assess the influence of agronomic management decisions (tillage type, weed management, herbicide application frequency and time) on effect of narrow row spacing on weed suppression, and corn and soybean yield. We compiled 1,904 pair-wise observations from 35 studies conducted in 12 states in the United States during 1961-2018. Averaged across individual observations, narrow row spacing suppressed weed density by 34%, weed biomass by 55%, and weed seed production by 45%, while it improved weed control by 32%, and crop yield by 11% compared with 76 cm row spacing. Narrow row spacing in soybean suppressed weed density by 42%, weed biomass by 71%, and increased crop yield by 12% compared with 76 cm row spacing. Although narrow row spacing had a non-significant effect on response variables in corn, the number of studies (n = 1-6) and observations (n = 1-59) addressing each response variable were limited. Tillage type (conventional and reduced) did not influence the response of weed density, control, and seed production in narrow row spacing; however, weed biomass and weed seed production reduced to a greater extent with the sequential application of herbicides compared with a single application. Thus, narrow row spacing in soybean can be integrated with other options for management of herbicide-resistant weeds.

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“…Palmer amaranth has a fluctuating emergence pattern that is affected by light, moisture, and temperature; it can germinate rapidly, completely germinating in 1 d under ideal conditions (Jha et al 2010;Jha and Norsworthy 2009;Spaunhorst 2016;Steckel et al 2004); and has a unique long emergence period that varies geographically based on the length of the local growing season. In the southeastern United States, Palmer amaranth emerges from May to September, and in the Midwest it emerges from May to August (McDonald et al 2021). Palmer amaranth has evolved resistance to many herbicide modes of action (Heap 2021).…”

Section: Introductionmentioning

confidence: 99%

Control of acetolactate synthase-inhibiting herbicide-resistant Palmer amaranth (Amaranthus palmeri) with sequential applications of dimethenamid-Pin dry edible bean

et al. 2022

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In Western Nebraska, Palmer amaranth is becoming more prevalent where acetolactate synthase (ALS)−inhibitor−resistant biotypes are widespread. There are limited effective postemergence (POST) herbicides labeled for ALS−inhibitor−resistant Palmer amaranth control in dry edible bean. The objective of this study was to evaluate the efficacy of dimethenamid−P in a sequential preemergence (PRE) fb (followed by) POST program at two POST application timings, V1 and V3, for controlling ALS−inhibitor−resistant Palmer amaranth in dry edible bean. A field study was conducted in 2019, 2020, and 2021 in Scottsbluff, NE. PRE−alone programs of pendimethalin + dimethenamid−P provided inconsistent Palmer amaranth control. Dimethenamid−P applied POST following a PRE application of pendimethalin + dimethenamid−P provided effective Palmer amaranth control (>90%) at 4 WAV3 only at the V1 application timing in 2019. In 2020 and 2021 Dimethenamid−P applied POST at V1 and V3 following a PRE application of pendimethalin + dimethenamid−P provided 99% and 98% Palmer amaranth control at 4 WAV3 and 98% and 94% Palmer amaranth control at harvest, respectively. Palmer amaranth biomass was reduced 95−99% and 96−98% compared to the non−treated control when dimethenamid−P was applied POST at V1 and V3, respectively, following a PRE application of pendimethalin + dimethenamid−P in 2020 and 2021. Mixing dimethenamid−P with imazamox + bentazon POST performed similarly to the fomesafen−containing treatments and dimethenamid−P alone POST. Dimethenamid−P applied POST following a PRE application of pendimethalin + dimethenamid−P resulted in similar yield as the fomesafen−containing treatments. If fomesafen is not an option due to the crop rotation interval restriction, using dimethenamid−P in a sequential PRE fb POST program is the only effective alternative to control ALS−inhibitor−resistant Palmer amaranth in Nebraska. The use of dimethenamid−P in a sequential PRE fb POST program, alone or mixed with foliar−active herbicides should be considered by dry edible bean growers who are dealing with ALS−inhibitor−resistant Palmer amaranth.

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Effect of row spacing and herbicide programs for control of glyphosate-resistant Palmer amaranth (Amaranthus palmeri) in dicamba/glyphosate-resistant soybean

Cited by 7 publications

References 55 publications

Response of peanut (Arachis hypogaea L.) to sublethal rates of dicamba plus glyphosate at different growth stages

Response of peanut (Arachis hypogaea L.) to sublethal rates of dicamba plus glyphosate at different growth stages

Does narrow row spacing suppress weeds and increase yields in corn and soybean? A meta-analysis

Control of acetolactate synthase-inhibiting herbicide-resistant Palmer amaranth (Amaranthus palmeri) with sequential applications of dimethenamid-Pin dry edible bean

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