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Control of multiple herbicide-resistant waterhemp (Amaranthus tuberculatus) with acetochlor-based herbicide mixtures in corn Weed Technol. (IF 1.4) Pub Date : 2024-03-18 Hannah E. Symington, Nader Soltani, Allan C. Kaastra, David C. Hooker, Darren E. Robinson, Peter H. Sikkema
Waterhemp is a summer annual, broadleaf weed with high fecundity, short seed longevity in the soil, and wide genetic diversity. Populations have evolved resistance to five herbicide modes of action (Groups 2, 5, 9, 14, and 27), which are present across southern Ontario; this has increased the challenge of controlling this competitive weed species in corn, the most important grain crop produced worldwide
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Common ragweed (Ambrosia artemisiifolia L.) accession in the Mid-Atlantic region resistant to ALS-, PPO-, and EPSPS-inhibiting herbicides Weed Technol. (IF 1.4) Pub Date : 2024-03-08 Frank D’Amico, Thierry Besançon, Alyssa Koehler, Lovreet Shergill, Melissa Ziegler, Mark VanGessel
Common ragweed is a troublesome weed in many crops. Farmers and crop advisors in the coastal Mid-Atlantic region have reported inadequate control of common ragweed in soybean with glyphosate and other herbicide modes of action. To determine if herbicide resistance was one of the causes of poor herbicide performance, twenty-nine accessions from four states (DE, MD, NJ, VA) where common ragweed plants
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Quantifying changes in the environmental impact of in-crop herbicide use in Saskatchewan Weed Technol. (IF 1.4) Pub Date : 2024-03-08 Elisabeta Lika, Chelsea Sutherland, Savannah Gleim, Stuart J. Smyth
The sustainable management of herbicides is critical to modern agriculture and the environment. This article examines the evolution and environmental implications of herbicide use in Saskatchewan agriculture. It quantifies changes in herbicide use and their environmental impacts by analyzing farm-level herbicide use data from 1991-1994 and 2016-2019 through the Environmental Impact Quotient. Results
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Oxyfluorfen-Resistant Rice Tolerance and Weed Control when using Oxyfluorfen Weed Technol. (IF 1.4) Pub Date : 2024-02-29 Casey H. Arnold, Jason K. Norsworthy, Thomas R. Butts, Trenton L. Roberts, Nick R. Bateman, Chad W Shelton
Herbicide-resistant barnyardgrass and weedy rice control, without crop injury, is a challenge for rice producers in the United States. Herbicides, such as oxyfluorfen, that were not initially labeled for rice, are now being evaluated as a new tool for weed control. The Roxy® trait allows for the use of oxyfluorfen in rice for weed control preemergence and postemergence. Experiments were initiated in
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Identification, mapping, and chemical control of fleabane resistant to glyphosate, chlorimuron, paraquat and 2,4-D Weed Technol. (IF 1.4) Pub Date : 2024-02-29 Juliano Bortoluzzi Lorenzetti, Maikon Tiago Yamada Danilussi, Alfredo Junior Paiola Albrecht, Arthur Arrobas Martins Barroso, Leandro Paiola Albrecht, André Felipe Moreira Silva, Guilherme Rossano dos Santos, Giuzeppe Augusto Maram Caneppele
Monitoring herbicide-resistant weeds makes it possible to study the evolution and spread of resistance, providing important information for management. The objective of this study was to map fleabane accessions in the states of Paraná (PR) and Mato Grosso do Sul (MS), Brazil, to identify herbicide-resistant accessions and their response to soybean pre-plant chemical burndown management strategies.
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Impact of Soil-Residual Herbicides on Industrial Hemp (Cannabis sativa L.) Phytotoxicity and Biomass Yield in West Texas Weed Technol. (IF 1.4) Pub Date : 2024-02-29 Atinderpal Singh, Rupinder Saini, Arjun Kafle, Manpreet Singh, Sukhbir Singh
Industrial hemp is a multipurpose crop cultivated for fiber, seed, human food, and animal feed. Hemp legalization in Texas creates a considerable potential to increase its acreage in semi-arid conditions; however, knowledge to grow hemp optimally in Texas is limited. Best management practices, including weed control, need to be evaluated for profitable hemp production. Since little is known about the
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Spray Interval, Application Order, and Plant Height Influences Control of Dicamba-Resistant Palmer amaranth Weed Technol. (IF 1.4) Pub Date : 2024-02-26 Delaney C. Foster, Thomas C. Mueller, Lawrence E. Steckel
Palmer amaranth, which is resistant to glyphosate and protoporphyrinogen oxidase inhibitors, remains a threat to cotton and soybean production in Tennessee. This is partly due to the recent evolution of dicamba-resistant Palmer amaranth in West Tennessee, which further complicates weed management. Experiments were conducted in 2021 and 2022 to determine the best timing between sequential applications
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Confirming resistance to PPO-inhibiting herbicides applied preemergence and postemergence in a Georgia Palmer amaranth population Weed Technol. (IF 1.4) Pub Date : 2024-02-15 Taylor Randell-Singleton, Lavesta C. Hand, Jenna C. Vance, Hannah E. Wright-Smith, A. Stanley Culpepper
Protoporphyrinogen oxidase- (PPO) inhibiting herbicides are used in over 40 agronomic and specialty crops across Georgia to manage weeds through residual and postemergence (POST) control. In 2017, a population of Palmer amaranth exhibiting reduced sensitivity to POST applications of PPO-inhibiting herbicides was identified by the University of Georgia. Seed were collected from the site along with a
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Control of Giant Ragweed (Ambrosia trifida) in Mesotrione-Resistant Soybean Weed Technol. (IF 1.4) Pub Date : 2024-02-12 Benjamin C. Westrich, William G. Johnson, Bryan G. Young
Preemergence (PRE) applications of mesotrione, a herbicide that inhibits 4-hydroxyphenolpyruvate dioxygenase (HPPD), have recently gained regulatory approval in appropriately traited soybean varieties. Giant ragweed is an extremely competitive broadleaf weed, and biotypes resistant to acetolactate synthase inhibitors (ALS-R) can be particularly difficult to manage with soil-residual herbicides in soybean
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Barnyardgrass (Echinochloa crus-galli) control and rice injury with labeled herbicides following exposure to sub-lethal concentrations of paraquat Weed Technol. (IF 1.4) Pub Date : 2024-02-12 Tameka L. Sanders, Jason A. Bond, Tom. W. Allen, Drew Gholson, L. Jason Krutz, Eric P. Webster
Rice in Mississippi is often in early seedling growth stages when paraquat-based herbicide treatments are commonly applied to corn, cotton, and soybean; therefore, off-target movement onto adjacent rice fields may occur. After an off-target movement event has occurred, weed management in the rice crop is still necessary. Field studies were conducted from 2019 to 2021 in Stoneville, MS, to evaluate
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Simulation-based nozzle density optimization for maximized efficacy of a machine-vision weed control system for applications in turfgrass settings Weed Technol. (IF 1.4) Pub Date : 2024-02-06 Paweł Petelewicz, Qiyu Zhou, Marco Schiavon, Gregory E. MacDonald, Arnold W. Schumann, Nathan S. Boyd
Targeted spray application technologies have the capacity to drastically reduce herbicide inputs, but to be successful, the performance of both machine vision (MV) based weed detection and actuator efficiency need to be optimized. This study assessed 1) the performance of spotted spurge recognition in ‘Latitude 36’ bermudagrass turf canopy using the You Only Look Once (YOLOv3) real-time multi-object
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Methiozolin rate and application frequency influence goosegrass and smooth crabgrass control in turf Weed Technol. (IF 1.4) Pub Date : 2024-02-06 John M. Peppers, J. Scott McElroy, Pawel M. Orlinski, James Baird, Pawel Petelewicz, Mikerly M. Joseph, I. Alejandra Sierra-Augustinus, Marco Schiavon, Shawn D. Askew
Methiozolin is labeled for goosegrass and smooth crabgrass control in golf course putting greens, but no peer-reviewed literature exists regarding this use. Greenhouse experiments were conducted evaluating goosegrass and smooth crabgrass response to increasing rates of methiozolin as affected by weed growth stage. In general, as weed growth stage increased, the methiozolin rate required to reduce weed
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Salvage Treatments for Barnyardgrass (Echinochloa crus-galli) Control in Rice Following Simulated Failed Herbicide Application Weed Technol. (IF 1.4) Pub Date : 2024-01-31 Hunter D. Bowman, Jason A. Bond, Thomas W. Allen, Daniel B. Reynolds, Taghi Bararpour, Darrin M. Dodds, Thomas W. Eubank
Florpyrauxifen-benzyl was commercialized in 2018 to target barnyardgrass and aquatic or broadleaf weeds. Field studies were conducted from 2019 to 2021 in Stoneville, MS, to evaluate barnyardgrass control following a simulated failure of florpyrauxifen-benzyl or other common postemergence (POST) rice herbicides. In the first field study, florpyrauxifen-benzyl was applied at 0 and 15 g ai ha-1 to rice
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Emergence Timing of Smallflower Umbrella Sedge (Cyperus difformis), Barnyardgrass (Echinochloa crus-galli), and Bearded Sprangletop (Leptochloa fusca spp. fascicularis) in California Water-Seeded Rice Weed Technol. (IF 1.4) Pub Date : 2024-01-29 Katie E. Driver, Aaron Becerra-Alvarez, Mohsen B. Mesgaran, Kassim Al-Khatib
Late-season weed emergence in California rice fields complicates decisions concerning the timing of control measures. The objective of this study was to predict the emergence of three problematic weed species in rice using thermal time models. Smallflower umbrella sedge, barnyardgrass, and bearded sprangletop seedlings were counted and removed daily at three locations across the Sacramento Valley rice-growing
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Weed communities after decades of mineral fertilization and tillage treatments in a corn-soybean rotation Weed Technol. (IF 1.4) Pub Date : 2024-01-29 Marie-Josée Simard, Noura Ziadi
Soil fertility and disturbance can potentially modify weed dynamics in a corn-soybean rotation. Knowing how added mineral fertilizers and tillage influence weed populations in the long term can provide insight into weed community shifts, which may affect future weed management requirements. The first objective of this study was to evaluate the effect of 24-25 years of nitrogen and phosphorus fertilization
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Influence of carrier water pH and hardness on imazapic efficacy for sicklepod (Senna obtusifolia L.) control in peanut Weed Technol. (IF 1.4) Pub Date : 2024-01-12 Olumide S. Daramola, Gregory E. MacDonald, Ramdas G. Kanissery, Barry L. Tillman, Hardeep Singh, Pratap Devkota
Carrier water quality is an important consideration for herbicide efficacy. Field and greenhouse studies were conducted from 2021 to 2023 to evaluate the effect of carrier water pH and hardness on imazapic efficacy for sicklepod control in peanut crops. In separate field experiments imazapic was applied postemergence at 0.071 kg ai ha−1 with carrier water pH levels of 5, 6, 7, 8, or 9; and hardness
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Evaluation of herbicide programs for the control of knotroot foxtail [Setaria parviflora (Poir.) Kerguélen] in bermudagrass pasture Weed Technol. (IF 1.4) Pub Date : 2024-01-12 Logan M. Dyer, Gerald M. Henry, Patrick E. McCullough, Jason Belcher, Nicholas T. Basinger
Knotroot foxtail has become more prevalent and problematic in pastures and hayfields in the southeastern United States. There are currently gaps in herbicide programs for the management of this species in bermudagrass forage production. This study was conducted to determine the efficacy of programmatic approaches to control knotroot foxtail in bermudagrass with fall postemergence (POST) herbicide applications
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Phosphorus influence on the critical period of weed control in sweet corn Weed Technol. (IF 1.4) Pub Date : 2023-12-27 Alex G. Rodriguez, Hardev S. Sandhu, Alan L. Wright, D. Calvin Odero
Understanding the effect of phosphorus (P) fertilization on weed interference with sweet corn is important for deciding appropriate fertilization levels and weed control programs. Field experiments were conducted in 2020 and 2021 in Belle Glade, FL to determine the influence of P fertilization levels (0 or residual P, 62.5, and 120 kg P2O5 ha-1) on the critical period of weed control (CPWC) in sweet
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Palmer amaranth (Amaranthus palmeri) control affected by weed size and herbicide spray solution with nozzle type pairings Weed Technol. (IF 1.4) Pub Date : 2023-12-22 Koffi Badou-Jeremie Kouame, Thomas R. Butts, Jason K. Norsworthy, Jason Davis, Leonard B. Piveta
Palmer amaranth can grow 4.2 mm in height per degree day; hence, delays of a few days in weed control deployment can result in applications of herbicides to weeds that are larger than those for which the herbicide label recommends. Therefore, it is critically necessary to understand the effect of plant size at the time of herbicide application in conjunction with herbicide spray solution and nozzle
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Postemergence-directed applications of pendimethalin for control of early-season weeds in chile pepper Weed Technol. (IF 1.4) Pub Date : 2023-12-22 Akash Bajagain, Erik A. Lehnhoff, Robert Steiner, Rebecca Creamer, Brian J. Schutte
In New Mexico chile pepper production, pendimethalin is traditionally applied shortly after crop thinning, which is 9 to 10 wk after crop seeding. Pendimethalin applications before crop thinning may be a method for controlling early-season weeds in chile pepper; however, chile pepper tolerance to early-season applications of pendimethalin is poorly understood. We conducted a greenhouse study to evaluate
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Response of cotton at different growth stages to imazapyr Weed Technol. (IF 1.4) Pub Date : 2023-12-21 Michael W. Marshall, Mitchell B. Williams, Michael A. Jones
A significant proportion of the forested production area in South Carolina is managed using aerial applications of imazapyr. Cotton injury from off-target movement of imazapyr has been observed in South Carolina. Field experiments were conducted twice at the Edisto Research and Education Center (EREC) in 2021 and 2022, and once at the Pee Dee Research and Education Center (PDREC) in 2022, to evaluate
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Feral rye (Secale cereale L.) control in quizalofop-resistant winter wheat in Oregon Weed Technol. (IF 1.4) Pub Date : 2023-12-21 Victor H. V. Ribeiro, Carol A. Mallory-Smith, Jennifer A. Gourlie, Chad W. Shelton, Judit Barroso
Managing winter annual grass weeds has long been a challenge in the dryland regions of the Pacific Northwest (PNW) where soft white winter wheat is grown. The recent development of quizalofop-resistant (CoAXium) wheat varieties allows growers to use quizalofop (QP), a herbicide that inhibits acetyl-CoA carboxylase (ACCase) for postemergence grass control. Field experiments were conducted over two winter
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Very long chain fatty acid-inhibiting herbicides: Current uses, site of action, herbicide-resistant weeds, and future Weed Technol. (IF 1.4) Pub Date : 2023-12-21 Amit J. Jhala, Mandeep Singh, Lovreet Shergill, Rishabh Singh, Mithila Jugulam, Dean E. Riechers, Zahoor A. Ganie, Thomas P. Selby, Rodrigo Werle, Jason K. Norsworthy
The herbicides that inhibit very long chain fatty acid (VLCFA) elongases are primarily used for residual weed control in corn, barley, oat, sorghum, soybean, sugarcane, certain vegetable crops, and wheat production fields in the United States. They act primarily by inhibiting shoot development of susceptible species, preventing weed emergence and growth. The objectives of this review were to summarize
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Echinochloa crus-galli seedlings surviving florpyrauxifen-benzyl applications have a greater potential to produce resistant seeds Weed Technol. (IF 1.4) Pub Date : 2023-11-30 Guoqi Chen, Xiangxin Zhuang, Aatiqa Masoom, Yang Chen, Yunhua Gu, Jiahao Zhang
Florpyrauxifen-benzyl (FPB) is an important postemergence rice herbicide. This study tested the potential for seed production in an FPB-resistant barnyardgrass population. A barnyardgrass population (NL) collected from a rice field in eastern China was highly resistant to FPB with a GR50 dose (the FPB dose causing a 50% reduction in fresh weight of aboveground parts) of 50.2 g ai ha−1. No significant
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Reduced irrigation impact on soil-applied herbicide dissipation and rotational crop response Weed Technol. (IF 1.4) Pub Date : 2023-11-30 Daniel M. Adamson, Gustavo M. Sbatella, Andrew R. Kniss, Franck E. Dayan
Soil-applied herbicides are important for controlling weeds in many crops but risk damage to susceptible rotational crops if they persist. Field studies were conducted in Powell, WY, from 2015 through 2017 to evaluate the effect of reduced water availability on soil-applied herbicide dissipation. Eight soil-applied herbicides, applied to dry bean or corn, were exposed to three season-long irrigation
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Peach Tree Response to Low-Dosages of Dicamba as Repeated Applications or with Various Spray Nozzles Weed Technol. (IF 1.4) Pub Date : 2023-11-29 Matthew B. Bertucci, Thomas R. Butts, Koffi Badou-Jeremie Kouame, Jason K. Norsworthy
Two low-dose dicamba exposure trials were conducted on container-grown peach trees in Fayetteville, AR. Peach trees were ‘July Prince’ scions grafted onto ‘Guardian’ rootstock and were transplanted into 19 L containers and received experimental dicamba treatments in each year. Container trials were initiated in 2020 and repeated on new trees in 2021. In the repeated application trial, dicamba was applied
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Plasticulture banana pepper response to clomazone applied pretransplanting Weed Technol. (IF 1.4) Pub Date : 2023-11-24 Jeanine Arana, Stephen L. Meyers, Emmanuel Cooper, Luis F. Medina Castro, Josué Cerritos, Carlos A. López
Few published studies exist documenting banana pepper tolerance to clomazone. Therefore, field trials were conducted in 2022 at two Indiana locations [Meigs Horticulture Research Farm and the Pinney Purdue Agricultural Center (PPAC)] to evaluate crop safety in plasticulture-grown banana pepper. The experimental design was a split-plot in which the main plot factor was the clomazone rate (0, 840, and
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Response of Soybean, Cotton, and Tobacco to Volatility of 2,4-D and Dicamba Formulations in Humidome Weed Technol. (IF 1.4) Pub Date : 2023-11-24 Estefania G. Polli, Travis W. Gannon, Mathieu LeCompte, Ronald R. Rogers, Daniel D. Beran
2,4-D and dicamba are postemergence herbicides widely used to control broadleaf weed species in crop and non-crop areas in the United States. Currently, there are multiple formulations of 2,4-D and dicamba available in the market. Even though the active ingredient is the same, the chemical form may vary by formulation, which can influence the volatility potential of these herbicides. Therefore, the
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Effectiveness of preemergence- and postemergence-applied oxyfluorfen in rice compared to current standards Weed Technol. (IF 1.4) Pub Date : 2023-11-06 Casey H. Arnold, Jason K. Norsworthy, Thomas R. Butts, Trenton L. Roberts, Nick R. Bateman, Chad W. Shelton
Control of barnyardgrass is becoming increasingly difficult as plants evolve resistance to herbicides. ROXY oxyfluorfen-resistant rice (ROXY® Rice Production System) has been developed to provide an alternative mode of action for controlling barnyardgrass and other weeds. In 2021 and 2022, field trials were conducted at the Pine Tree Research Station near Colt, AR; the Northeast Research and Extension
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Interaction of quizalofop-p-ethyl with 2,4-D choline and/or glufosinate for control of volunteer corn in corn resistant to aryloxyphenoxypropionates Weed Technol. (IF 1.4) Pub Date : 2023-11-06 Mandeep Singh, Vipan Kumar, Stevan Z. Knezevic, Suat Irmak, John L. Lindquist, Santosh Pitla, Amit J. Jhala
Corn that is resistant to aryloxyphenoxypropionate, known commercially as Enlist™ corn, enables the use of quizalofop-p-ethyl (QPE) as a selective postemergence (POST) herbicide for control of glufosinate/glyphosate-resistant corn volunteers. Growers usually mix QPE with 2,4-D choline or glufosinate or both to achieve broad-spectrum weed control in Enlist corn. The objectives of this study were 1)
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Influence of cover cropping and conservation tillage on weeds during the critical period for weed control in soybean Weed Technol. (IF 1.4) Pub Date : 2023-11-06 Veronica Yurchak, Alan Leslie, Cerruti R.R. Hooks
Limited research has been directed at evaluating the ability of single cover crop plantings to suppress weeds in crops beyond the initial field season. Thus, this experiment was conducted to investigate the ability of a second-year self-regenerated annual and second-year perennial cover crop planting to suppress weeds during the critical period for weed control (CPWC) in soybean crops. Whole-plot treatments
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Growth and yield response of peanut to simulated drift of glufosinate at vegetative and reproductive growth stages Weed Technol. (IF 1.4) Pub Date : 2023-11-06 Olumide S. Daramola, Navjot Singh, Joseph E. Iboyi, Pratap Devkota
The increased incidence of glyphosate-resistant weeds has led to an exponential increase in the use of glufosinate on glufosinate-resistant corn, cotton, and soybean crops. Field experiments were conducted in 2021 and 2022 to evaluate peanut response to glufosinate at 25 and 60 d after planting, corresponding to vegetative (V3) and reproductive (R4) growth stages, at 1.2, 4.7, 18.9, 75.5, and 302 g
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Investigation of inquiries on weed control efficacy of XtendiMax® herbicide with VaporGrip® technology Weed Technol. (IF 1.4) Pub Date : 2023-11-06 Aruna Varanasi, Daljit Singh, Jenny Krebel, Jeffrey Herrmann, John Willis, Greg Elmore, Joshua Fischer, Ty Witten, Graham Head, Chandrashekar Aradhya
Herbicide resistance in weeds significantly threatens crop production in the United States. The introduction of dicamba-resistant soybean and cotton stacked with other herbicide tolerance traits has provided farmers with the flexibility of having multiple herbicide options to diversify their weed management practices and delay resistance evolution. XtendiMax® herbicide with VaporGrip® Technology is
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Herbicide effects on dormant and postdormant hybrid bermudagrass putting green turf Weed Technol. (IF 1.4) Pub Date : 2023-10-23 John M. Peppers, Shawn D. Askew
Herbicide resistance coupled with a dearth of selective herbicide options has increased the complexity of annual bluegrass control in hybrid bermudagrass putting greens. Cumyluron, endothall, and methiozolin are herbicides that control annual bluegrass by inhibiting novel sites of action compared with the herbicides currently used for turfgrass management in the United States. However, peer-reviewed
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Sulfentrazone crop safety and efficacy in cabbage and broccoli Weed Technol. (IF 1.4) Pub Date : 2023-10-23 Laura Pineda-Bermudez, Thierry E. Besançon, Lynn M. Sosnoskie
In 2021 and 2022, research was initiated at two locations to evaluate the efficacy and safety of sulfentrazone in transplanted cabbage and broccoli. Treatments included oxyfluorfen at 560 g ha−1 applied pretransplant (PRE-T), sulfentrazone applied at 116 or 233 g ha−1 PRE-T, and S-metolachlor applied at 715 g ha−1 immediately after transplanting (POST-T) followed by (fb) oxyfluorfen applied at 210
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Use of low tunnels to describe effects of herbicide, adjuvant, and target surface on dicamba volatility Weed Technol. (IF 1.4) Pub Date : 2023-10-16 Maria Leticia Zaccaro-Gruener, Jason K. Norsworthy, Leonard B. Piveta, L. Tom Barber, Andy Mauromoustakos, Thomas C. Mueller, Trenton L. Roberts
Investigations of the relevance of low-tunnel methodology and air sampling concerning the off-target movement of dicamba were conducted from 2018 to 2022, focused primarily on volatility. This research, divided into three experiments, evaluated the impact of herbicides and adjuvants added to dicamba and the type of surface treated on dicamba volatility. Treatment combinations included glyphosate and
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Enhancing winter rye termination by mixing glyphosate with other herbicides using water or UAN as the carrier Weed Technol. (IF 1.4) Pub Date : 2023-10-16 Olivia M. Noorenberghe, Peter H. Sikkema, Michael J. Cowbrough, David C. Hooker, Nader Soltani, François J. Tardif
Herbicides are often used to terminate cover crops. Producers would like to use herbicides that work quickly, are effective, and do not increase the risk of selecting herbicide-resistant weeds. Eight experiments were conducted to determine whether mixing glyphosate (900 g a.e. ha−1) with rimsulfuron (15 g a.i. ha−1), mesotrione (100 g a.i. ha−1), or rimsulfuron + mesotrione enhances winter rye control
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Responses of rice genotypes to foliar-applied metribuzin Weed Technol. (IF 1.4) Pub Date : 2023-10-13 Sarah L. Marsh, Kassim Al-Khatib
The increasing development of herbicide resistance in weeds found in rice cropping systems has encouraged researchers to evaluate alternate herbicides to prevent and manage herbicide-resistant weed biotypes. Metribuzin is a photosynthetic-inhibiting herbicide that controls various important grass and broadleaf weeds. Several crops, including soybean, wheat, peas, and potato, have shown differential
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Ethofumesate-resistant annual bluegrass (Poa annua) in grass seed production systems Weed Technol. (IF 1.4) Pub Date : 2023-10-13 Vera Vukovic, Clint M. Mattox, Alec R. Kowalewski, Brandon C. McNally, Cale A. Bigelow, Stephen L. Meyers, James T. Brosnan, Aaron J. Patton
The prolific seed production and polyploidy of annual bluegrass allow for the rapid development of herbicide resistance. Ethofumesate-resistant annual bluegrass plants were identified in the 1990s in grass seed production in Oregon, but their prevalence and distribution are not well documented. Therefore a dose–response experiment was initiated to determine the potential level of ethofumesate resistance
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The first weed management textbook in the United States (part 2) Weed Technol. (IF 1.4) Pub Date : 2023-10-12 John D. Byrd, David P. Russell, Kayla L. Broster
This article overviews the earliest weed management book published in the United States. The most problematic weeds of that era are named, along with suggestions for their control.
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Evaluating cover crop tolerance to corn residual herbicides using field-treated soil in greenhouse bioassay Weed Technol. (IF 1.4) Pub Date : 2023-10-12 Tatiane Severo Silva, Nicholas John Arneson, Daniel Valadão Silva, Rodrigo Werle
More growers across the U.S. Midwest are considering interseeding or overseeding cover crops into corn for soil health purposes. One challenge of this practice is the potential injury from soil residual herbicides applied preemergence (PRE) for weed control in corn to the interseeded and overseeded cover crop species. Field-treated soil was collected in 2021 and 2022 at Janesville, WI, and Lancaster
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Synthetic auxin herbicides do not injure intermediate wheatgrass or affect grain yield Weed Technol. (IF 1.4) Pub Date : 2023-10-04 Erica D. Shoenberger, Jacob M. Jungers, Eugene P. Law, Clair L. Keene, Antonio DiTommaso, Craig C. Sheaffer, Donald L. Wyse, Valentin D. Picasso, David E. Stoltenberg
Intermediate wheatgrass (IWG) is a cool-season perennial grass developed as a dual-purpose grain and forage crop. One barrier to adopting this crop is a lack of information on the effects of herbicides on IWG for grain production. An experiment was conducted to evaluate herbicide effects on IWG grain yield, crop injury, and weed control over 2 yr (2019 to 2021) at sites in Wisconsin, Minnesota, New
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Multistate screening of Palmer amaranth (Amaranthus palmeri) and waterhemp (Amaranthus tuberculatus) sensitivity to glufosinate, dicamba and 2,4-D in the United States Weed Technol. (IF 1.4) Pub Date : 2023-09-29 Daljit Singh, Andrew Tyre, Alejandro Perez-Jones, Jenny Krebel, John Willis, Jeffrey Herrmann, Tracy Klingaman, Graham Head, Chandrashekar Aradhya
Herbicide resistance in Palmer amaranth and waterhemp is on the rise and poses a great concern to growers in the United States. A multistate screening was conducted for these two weed species in the United States to assess their sensitivity to glufosinate, dicamba, and 2,4-D. The screening was designed to understand the weed sensitivity landscape and emerging trends in resistance evolution by testing
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Evaluation of chemical control and seasonal application options for smutgrass (Sporobolus indicus) Weed Technol. (IF 1.4) Pub Date : 2023-09-29 Zachary S. Howard, Scott A. Nolte, Mark Hussey, Morgan L. Treadwell, Brent Sellers
Smutgrass is a non-native perennial weed that is problematic because of its poor palatability to cattle and its difficulty to control once established. Limited literature exists to explain the effectiveness of herbicides other than hexazinone for smutgrass control and forage injury. This study aimed to evaluate seasonal applications of labeled herbicides used on forage for maximum smutgrass control
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Evaluation of goosegrass response to combinations of topramezone and chlorothalonil Weed Technol. (IF 1.4) Pub Date : 2023-09-25 John M. Peppers, Matthew T. Elmore, Shawn D. Askew
Few herbicides are registered for goosegrass control in creeping bentgrass turfgrass. Topramezone controls goosegrass and is labeled for use on creeping bentgrass, but potential injury risks lead many turf managers to frequently apply it at a low-dose. This application practice increases the likelihood that topramezone treatments will be mixed with fungicide treatments. Previous research found that
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Extension event attendance increases adoption of weed management practices by sports field managers Weed Technol. (IF 1.4) Pub Date : 2023-09-20 George B. Frisvold, Chandrakant Agme, David Ervin, Jennifer Allen, Shawn Askew, Rebecca Grubbs Bowling, James Brosnan, Matthew Elmore, Travis Gannon, John Kaminski, Lambert McCarty, James D. McCurdy, Aaron J. Patton, Jacob Taylor, J. Bryan Unruh, Muthukumar Bagavathiannan
Data from a national survey of 348 U.S. sports field managers were used to examine the effects of participation in Cooperative Extension events on the adoption of turfgrass weed management practices. Of the respondents, 94% had attended at least one event in the previous 3 yr. Of this 94%, 97% reported adopting at least one practice as a result of knowledge gained at an Extension turfgrass event. Half
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Response of dicamba-resistant Palmer amaranth and cotton to malathion applied in conjunction with dicamba Weed Technol. (IF 1.4) Pub Date : 2023-09-15 Delaney C. Foster, Peter A. Dotray, Stanley Culpepper, Lawrence E. Steckel
Cotton and soybean growers were offered new technologies in 2016, expanding in-crop herbicide options to include dicamba or 2,4-D. Within 3 yr of commercialization, dicamba use in these crops increased 10-fold, and growers began to report Palmer amaranth escapes in dicamba-tolerant production systems in western Tennessee. In 2020, Palmer amaranth seed was collected from eight Tennessee locations where
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Herbicides for monochoria (Monochoria vaginalis) control in transplanted rice Weed Technol. (IF 1.4) Pub Date : 2023-09-04 Zahra Hazrati, Bijan Yaghoubi, Pershang Hosseini, Bhagirath Singh Chauhan
In Iran, monochoria is a noxious weed in fields of transplanted rice. Two field experiments were conducted to assess the efficacy of soil-applied and foliar-applied herbicides to control monochoria in transplanted rice. Prepackaged herbicides (triafamone plus ethoxysulfuron applied at 40 g ai ha−1, pyrazosulfuron-ethyl plus pretilachlor applied at 382.5 g ai ha−1, and pendimethalin plus clomazone applied
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The first weed science textbooks in the United States (Part 1) Weed Technol. (IF 1.4) Pub Date : 2023-09-04 John Dukes Byrd, David P. Russell, Kayla Broster
This article reviews the first textbooks focused on weed identification published in the United States. We go on to discuss those species considered the most troublesome weeds in agriculture. Common and scientific names written in the original texts have been cross referenced to current common and scientific names.
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Evaluation of crop-topping strategies to reduce common lambsquarters (Chenopodium album) seed production in potato production systems Weed Technol. (IF 1.4) Pub Date : 2023-09-04 Laura Anderson, Scott Neil White, Andrew McKenzie-Gopsill
Potato producers in Canada’s Atlantic provinces of Prince Edward Island (PE) and New Brunswick rely on photosystem II (PSII)-inhibiting herbicides to provide season-long weed control. Despite this fact, a high proportion of common lambsquarters populations in the region have been identified as resistant to this class of herbicides. Crop-topping is a late-season weed management practice that exploits
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Weed control in corn with tolpyralate and atrazine plus grass herbicides Weed Technol. (IF 1.4) Pub Date : 2023-09-04 Nader Soltani, Christy Shropshire, Peter H. Sikkema
Six field experiments were established in southwestern Ontario in 2021 and 2022 to evaluate whether the addition of a grass herbicide (acetochlor, dimethenamid-p, flufenacet, pendimethalin, pyroxasulfone, or S-metolachlor) to tolpyralate + atrazine improves late-season weed control in corn. Tolpyralate + atrazine caused 12% and 5% corn injury at 1 and 4 wk after herbicide application (WAA); corn injury
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Cereal rye residue management tactics influence interrow and intrarow weed recruitment dynamics in field corn when planting green Weed Technol. (IF 1.4) Pub Date : 2023-09-04 John M. Wallace, Tosh Mazzone, Zachary Larson
Delaying cover crop termination until cash crop planting (i.e., planting green) is an emerging no-till practice. Improved management recommendations are needed for optimizing weed suppression benefits while minimizing other pest, fertility, and crop management risks when planting green in corn production systems. In a 2-yr field experiment, we evaluated the interaction between cereal rye residue management
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Russian thistle (Salsola tragus) postharvest control and plant dispersal Weed Technol. (IF 1.4) Pub Date : 2023-09-04 Fernando H. Oreja, Drew J. Lyon, Jennifer Gourlie, Henry C. Wetzel, Judit Barroso
Russian thistle is one of the most important broadleaf weeds in the semiarid U.S. Pacific Northwest. It consumes soil water after wheat harvest, compromising the yield of the following crop. The objectives of this work were to determine the impact of post–wheat harvest herbicide application timing on Russian thistle control and of stubble height on Russian thistle postharvest control and plant dispersal
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Effect of spray droplet spectra on control of Poa annua with pronamide Weed Technol. (IF 1.4) Pub Date : 2023-09-04 Martin Ignes, J. Connor Ferguson, Te-Ming Tseng, Barry R. Stewart, Edicarlos B. Castro, James D. McCurdy
Annual bluegrass is a troublesome weed in turfgrass, with reported resistance to at least 12 herbicide sites of action. The mitotic-inhibiting herbicide pronamide has both preemergence and postemergence activity on susceptible annual bluegrass populations. Previous studies suggest that postemergence activity may be compromised due to lack of root uptake, as well as target-site- and translocation-based
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Characterization of imazamox-resistant shattercane (Sorghum bicolor L.) populations from Kansas Weed Technol. (IF 1.4) Pub Date : 2023-09-04 Vipan Kumar, Rui Liu, Deepika Chauhan, Ramasamy Perumal, Sarah Morran, Todd A. Gaines, Prashant Jha
Shattercane is a problematic summer annual grass weed species in regions that produce grain sorghum. Three shattercane populations (DC8, GH4, and PL8) collected from sorghum fields from northwestern Kansas survived the field-use rate (52 g ha−1) of postemergence-applied imazamox. The main objectives of this research were to 1) confirm and characterize the level of resistance to imazamox in putative
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Assessment of dicamba and 2,4-D residues in Palmer amaranth and soybean Weed Technol. (IF 1.4) Pub Date : 2023-09-04 Maria Leticia Zaccaro-Gruener, Jason K. Norsworthy, Leonard B. Piveta, L. Tom Barber, Andy Mauromoustakos
Off-target movement of 2,4-D and dicamba is sometimes to blame as the cause of symptoms observed in weeds growing in production fields. Pesticide regulatory authorities routinely sample tissues of weeds or crops from fields under investigation for potential illegal use of auxin herbicides. This research aimed to determine if analytical tests of herbicide residue on soybean or Palmer amaranth vegetation
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Effects of paraquat application at cover crop planting on cover crop biomass and weed suppression Weed Technol. (IF 1.4) Pub Date : 2023-08-29 Cynthia Sias, Kevin W. Bamber, Vipin Kumar, Vijay Singh, Michael L. Flessner
Successful cover crop (CC) establishment in the fall is important to maximize CC production, which is critical for achieving many objectives of CCs. Competition from winter weeds may reduce CC establishment and biomass production. A preplant herbicide, such as paraquat, at the time of CC planting in the fall will reduce winter weed pressure resulting in better establishment and growth. An experiment
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Smooth scouringrush (Equisetum laevigatum) control with glyphosate is affected by surfactant choice and application time Weed Technol. (IF 1.4) Pub Date : 2023-08-29 Marija Savic, Mark E. Thorne, Drew J. Lyon
Smooth scouringrush is a creeping perennial with a high silica content in stems that may impede herbicide uptake. Smooth scouringrush has become a troublesome weed in no-till cropping systems across eastern Washington. In previous field studies, glyphosate provided inconsistent control of smooth scouringrush. The objective of this study was to determine if the addition of an organosilicone surfactant
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Echinochloa in mid-southern U.S. and California rice: What is known and what are the knowledge gaps? Weed Technol. (IF 1.4) Pub Date : 2023-08-11 Amar S. Godar, Jason K. Norsworthy
Several species of Echinochloa P. Beauv., introduced at multiple events, have established themselves as a persistent concern for U.S. rice production. In this review, we highlight the key biological characteristics of economically relevant Echinochloa in U.S. rice production, revisit their historical trajectory, and suggest research directions for their management with special reference to barnyardgrass
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Sensitivity of TamArk™ grain sorghum and monocot weed species to ACCase- and ALS-inhibiting herbicides Weed Technol. (IF 1.4) Pub Date : 2023-08-09 Jacob Fleming, Jason K. Norsworthy, Muthukumar Bagavathiannan, Tom Barber
Only a limited number of herbicides are available to provide postemergence (POST) control of selective monocot weeds in grain sorghum crops. The herbicides currently labeled for use with grain sorghum have strict use restrictions, low efficacy on johnsongrass, or weed resistance issues. To introduce a new effective herbicide mode of action for monocot control, multiple companies and universities have