Impact of postemergence herbicides on soybean injury and canopy formation

Priess, Grant L.; Norsworthy, Jason K.; Roberts, Trenton L.; Gbur, Edward E.

doi:10.1017/wet.2020.55

Cited by 8 publications

(8 citation statements)

References 32 publications

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“…Due to both economic and environmental factors, post-emergence application of ALS-inhibiting herbicides is the most common weed control strategy in soybean in Italy, and it is likely one of the driving factors of the recent spreading of ALS-resistant amaranths [15]. Several herbicides with alternative sites of action, such as inhibitors of photosystem (PS) I and II, 5-enolpyruvylshikimate-3-phosphate (EPSP) synthase and carotenoid biosynthesis can provide effective control of ALS-resistant populations of A. palmeri [16,17]. However, given the ability of this species to evolve resistance against herbicides with different sites of action [18], the efficacy of potential alternative herbicides should be assessed at local level before recommending their use.…”

Section: Introductionmentioning

confidence: 99%

Recent Discovery of Amaranthus palmeri S. Watson in Italy: Characterization of ALS-Resistant Populations and Sensitivity to Alternative Herbicides

et al. 2021

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Amaranthus palmeri S. Watson (Amaranthaceae Juss.) is a dioecious noxious weed, native to the Americas, which infests summer crops. It causes high crop losses, and rapidly evolves resistance to herbicides. In Europe, A. palmeri was recorded mostly as a casual alien, but in 2018 it was reported infesting a soybean field in Italy, and the next year two more populations were found in the same area. Experiments were conducted on these three populations to evaluate the resistance to ALS-inhibiting herbicides, to determine the main resistance mechanisms involved and assess the efficacy of alternative herbicides with different sites of action than ALS. The three populations were confirmed cross-resistant to ALS-inhibiting herbicides (thifensulfuron-methyl and imazamox). Gene sequencing identified a Trp to Leu substitution at position 574 of ALS gene in resistant plants, proving that the main resistance mechanism for the three populations is target-site related. The presence of other resistance mechanisms cannot be excluded. Metobromuron, metribuzin and glyphosate are still effective on these populations.

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Section: Introductionmentioning

confidence: 99%

Recent Discovery of Amaranthus palmeri S. Watson in Italy: Characterization of ALS-Resistant Populations and Sensitivity to Alternative Herbicides

et al. 2021

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“…The differences between the two application methods (roller wiper versus broadcast) as influenced by the preemergence option and the mortality of the Palmer amaranth may be attributed to the differences in efficacy of the preemergence options. The premix of flumioxazin + pyroxasulfone may have provided a longer residual compared to S ‐metolachlor; pyroxasulfone has a half‐life of 71 days compared to a half‐life of 27 days for S ‐metolachlor 47 . Residual activity may have delayed growth of Palmer amaranth in the plots treated with flumioxazin + pyroxasulfone preemergence.…”

Section: Resultsmentioning

confidence: 99%

“…The premix of flumioxazin + pyroxasulfone may have provided a longer residual compared to S-metolachlor; pyroxasulfone has a half-life of 71 days compared to a half-life of 27 days for S-metolachlor. 47 Residual activity may have delayed growth of Palmer amaranth in the plots treated with flumioxazin + pyroxasulfone preemergence. Furthermore, the use of two separate, effective herbicides with the use of flumioxazin + pyroxasulfone compared to the single herbicide used with the treatments utilizing S-metolachlor would also explain the increase in Palmer amaranth suppression by those plots treated with flumioxazin + pyrixasulfone.…”

Section: Herbicide Placement Studymentioning

confidence: 99%

Utility of roller wiper applications of dicamba for Palmer amaranth control in soybean

Farr

Norsworthy

Barber

et al. 2022

Pest Management Science

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BACKGROUND: The commercialization of dicamba-resistant soybean has resulted in increased concern for off-target movement of dicamba onto sensitive vegetation. To mitigate the off-target movement through physical drift, one might consider use of rope wicks and other wiper applicators. Although wiper-type application methods have been efficacious in pasture settings, the utility of dicamba using wiper applicators in agronomic crops is not available in scientific literature. To determine the utility of roller wipers for dicamba applications in dicamba-resistant soybean, two separate experiments were conducted in the summer of 2020 and replicated in both Keiser and Fayetteville, AR, USA. RESULTS: Utilizing opposing application directions and a 2:1:1 ratio of water: formulated glyphosate: formulated dicamba were the most efficacious practices for controlling Palmer amaranth. The high herbicide concentrations and wiping in opposing directions increased dicamba-resistant soybean injury when the wiper contacted the crop, but no yield loss was observed because of this injury. Broadcast applications resulted in greater Palmer amaranth mortality than roller wiper applications, and the most effective roller wiper treatments were when two sequential applications were made inside the crop canopy.CONCLUSIONS: Dicamba applications require adequate coverage for optimum weed control. While efforts can be made to increase roller wiper efficacy by optimizing coverage and timing of applications, broadcast applications are superior to roller wiper applicators for weed control. Roller wiper applications did not reduce soybean yield, thus wiper-type applications may be safely used in dicamba-resistant soybean, albeit the likelihood for off-target damage caused by volatilization of these treatments would need to be investigated.

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“…Plant biomass was only influenced by acifluorfen POST at ARF in 2020. Acifluorfen is known to bronze, crinkle, or cause necrotic spots on leaves due to the accumulation of tetrapyrroles (Matringe & Scalla, 1988), which may reduce growth within 2 wk after application, and subsequently delay canopy closure (Priess et al., 2020).…”

Section: Discussionmentioning

confidence: 99%

Auxin‐based herbicide program for weed control in auxin resistant soybean

Amajioyi

Nleya

Reicks

et al. 2022

Agrosystems Geosci & Env

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Soybean [Glycine max (L.) Merr.] cultivars resistant to synthetic auxin herbicides have provided another mode of action for the postemergence broadleaf weed control. This field study was conducted at three South Dakota locations [Northeast, NERF; east-central, ARF; and Southeast, SERF) in 2019 and two locations (ARF and SERF) in 2020. The Enlist E3 and Roundup Ready 2 Xtend cultivars were planted at three dates (early, mid-, and late season) to examine weed control, agronomic characteristics, nodulation, and yield. Preemergence (PRE) treatment was flumioxazin + metribuzin + S-metolachlor + glyphosate + pendimethalin. Two postemergence (POST) treatments, based on cultivar, were compared with PRE-only. The PREonly treatment had numerous grasses {including green foxtail [Setaria viridis (L.) P. Beauv.] and yellow foxtail [S. pumila (Poir.) Roem. & Schult.], volunteer corn (Zea mays L.), barnyard grass [Echinochola crus-galli (L.) Beauv.], large crabgrass [Digitaria sanguinalis (L.) Scop.], woolly cupgrass [Eriochloa villosa (Thunb.) Kunth]} and broadleaf weeds (including redroot pigweed [Amaranthus retroflexus L.], common lambsquarters [Chenopodium album L.], waterhemp [Amaranthus rudis Sauer])with high density and biomass. POST treatments controlled most of the broadleaf species, although some grasses remained. Yields were similar within a location and year, although differences occurred among planting dates. In 2019, planting date did not influence final yield at ARF (average yield 3,084 kg ha −1 ). Yield was greatest for the early (NERF) and mid-planting dates (NERF and SERF) compared with late-season planting. In 2020, dry conditions occurred, and yields at ARF and SERF were lowest for the late-season plantings (ranging from 37 to 73% lower depending on cultivar) compared with the early season planting. In 2020, dicamba + glyphosate

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Impact of postemergence herbicides on soybean injury and canopy formation

Cited by 8 publications

References 32 publications

Recent Discovery of Amaranthus palmeri S. Watson in Italy: Characterization of ALS-Resistant Populations and Sensitivity to Alternative Herbicides

Recent Discovery of Amaranthus palmeri S. Watson in Italy: Characterization of ALS-Resistant Populations and Sensitivity to Alternative Herbicides

Utility of roller wiper applications of dicamba for Palmer amaranth control in soybean

Auxin‐based herbicide program for weed control in auxin resistant soybean

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