Download or read book Annual Weed Control in Isoxaflutole Resistant Soybean written by Andrea Smith and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Thirty field trials were conducted over a two-year period (2017 and 2018) at five locations to evaluate the interactions of three rates of isoxaflutole + metribuzin, the efficacy of one-, two-, and three-way herbicide tank-mixtures, and one- and two-pass herbicide programs on ten annual broadleaf and grass weed species in isoxaflutole-resistant soybean. The co-application of isoxaflutole + metribuzin provided similar or greater control of all weed species compared to the herbicides applied alone. Isoxaflutole + metribuzin had additive or synergistic control of weed species evaluated. The addition of a soil applied grass herbicide to isoxaflutole + metribuzin did not improve weed control compared to isoxaflutole + metribuzin. Isoxaflutole + metribuzin followed by glyphosate provided 98-100% control of weed species evaluated. Weed control efficacy of herbicides applied preemergence was influenced by rainfall after application. Annual weeds can be effectively controlled in isoxaflutole-resistant soybean using multiple different weed management strategies.
Download or read book Integrated Weed Management and Herbicide Application Parameters for Herbicide resistant Soybean in Kansas written by Chad Joseph Lammers and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrated weed management and herbicide application practices were assessed in field and greenhouse studies to improve weed control in herbicide-resistant soybeans (Glycine max (L.) Merr.) grown in Kansas. The field study was conducted to evaluate weed control, soybean yield, and profitability in two herbicide-resistant soybean systems and two row spacings. 2,4-D-, glyphosate-, and glufosinate- resistant (Enlist E3) and isoxaflutole-, glyphosate-, and glufosinate- resistant (LLGT27) soybeans were planted in 38- and 76-cm row spacing for four site-years. Three herbicide treatments were evaluated in each system: pre-emergence herbicide only (PRE), PRE followed by early post-emergence (POST), and POST plus overlapping residual (POR). Weed control was evaluated every 2 weeks after PRE application through R7 soybean. Weed biomass was collected before POST applications and at R7 soybean. Soybean yield was recorded at harvest. Data were subjected to analysis of variance and means separation. In Ottawa during 2020, POST and POR treatments resulted in ≥ 99% control for all species four WAT, while PRE resulted in ≥ 84% control. Similarly, control at Ashland Bottoms was ≥ 90% for POST and POR treatments, while PRE resulted in 7% for isoxaflutole- 62% for 2,4-D-resistant soybeans. All treatments resulted in ≥ 95% control at Scandia in 2021. Row spacing had a minimal effect on weed control and mixed results for yield. In the greenhouse study, the objective was to determine the effect of herbicide combination, optimize carrier volume, and evaluate weed height on weed control. Co-applications of combinations of 2,4-D choline, glyphosate, and glufosinate were applied in carrier volumes of 93-, 140-, and 187- L ha−1to 5-, 10-, and 20-cm Palmer amaranth (Amaranthus palmeri S. Watson) and large crabgrass (Digitaria sanguinalis L.). Visual ratings and above ground biomass were collected four weeks after treatment. Water-sensitive paper was also sprayed with the same herbicide combinations and carrier volumes to evaluate differences in spray coverage. Data were subjected to analysis of variance and means separation. Carrier volume did not affect Palmer amaranth or large crabgrass control. Control of 5-, 10-, and 20-cm Palmer amaranth was 100%, ≥ 91%, and 6.7 to 79%, respectively, and variation was caused by the herbicide combinations. 2,4-D plus glyphosate provided the greatest Palmer amaranth control. Large crabgrass control pooled for both experiments was ≥ 82% when treatments were applied at 5 cm, but control of 10- or 20-cm large crabgrass was reduced to 51 to 56%. There was a carrier volume by herbicide co-application interaction for the number of droplets deposited and percent area covered on water-sensitive paper. Co-applications containing glufosinate had more droplets than those not containing glufosinate. 2,4-D plus glyphosate had the smallest percent area covered, compared to the other herbicide co-applications. Data from the field study confirms that two-pass herbicide programs are superior to PRE- only programs, regardless of the inclusion of a layered residual herbicide. However, this research did not evaluate the impact of layered residual herbicides on weed seed production, which is crucial for long-term weed management. Results from the greenhouse study suggest that under ideal conditions, carrier volume is less important than herbicide combination and weed size for control of Palmer amaranth and large crabgrass.
Download or read book Optimization of Weed Control Systems in Herbicide Resistant Soybean written by Justin Lee Norris and published by . This book was released on 2000 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integration of Cultural Practices and Herbicide resistant Crop Technologies for the Management of Glyphosate resistant Waterhemp in Soybean written by John Lawrence Schultz and published by . This book was released on 2014 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Common waterhemp (Amaranthus rudis Sauer) is the most prominent and troublesome weed in agronomic crops in Missouri, Iowa, and Illinois. As of 2014 in the U.S., herbicide resistance was present in waterhemp to one or more of the following herbicide modes of action: growth regulators, EPSPS-, acetolactate synthase (ALS)-, protoporphyrinogen (PPO)-, photosystem II (PSII)-, and 4-hydroxyphenylpyruvate dioxygenase (HPPD)-inhibiting herbicides. The objectives of this research were 1) determine the effect of cultural and herbicidal control methods on resistant waterhemp in glufosinate-resistant soybean, 2) evaluate weed management programs and response of HPPD-resistant soybean to HPPD-inhibiting herbicides, and 3) investigate the distribution of herbicide resistances and molecular mechanisms conferring resistance in Missouri waterhemp populations. Results from this research indicate that preemergence followed by postemergence with residual (PRE fb POST w/RES) herbicide programs with 19- or 38-cm rows will provide the greatest glyphosate-resistant (GR) waterhemp control in glufosinate resistant soybean. PRE fb POST programs improved GR waterhemp control and biomass reduction over all one- and two-pass POST programs in HPPD-resistant soybean. The addition of isoxaflutole to PRE treatments in HPPD- resistant soybean was not always necessary to provide high levels of weed control, but incorporating isoxaflutole or mesotrione in PRE fb POST programs allows for a greater diversity of effective herbicide modes of action. Resistance to five major herbicide modes of action was confirmed with at least 52% of 187 waterhemp populations being resistant to two modes of action. Results indicate PRE fb POST programs with multiple, effective modes of action will be necessary to control Missouri waterhemp populations in the future.
Download or read book Partial Returns of Weed Management Systems in Herbicide resistant and Conventional Soybean written by Angela Ann Midthurn-Hensen and published by . This book was released on 2001 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrating Cover Crops in No till Corn and Soybean to Diversify Herbicide Resistant Weed Management in the Mid Atlantic written by Jess Marie Bunchek and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Widespread adoption of genetically-engineered, herbicide-resistant (HR) crops have simplified crop rotation diversity and the use of single-tactic, herbicide-based weed management programs. These practices have resulted in an HR weed epidemic, where glyphosate-resistant weeds are especially problematic. Glyphosate-resistant weeds like horseweed [Conyza canadensis (L.)] and pigweeds (Amaranthus spp.) threaten grower productivity and long-term efficacy of common agronomic herbicides. Thus, integrated weed management (IWM) programs that implement both ecological- and herbicide-based tactics are needed in no-till annual grain systems to (1) manage current HR weeds, (2) reduce HR selection pressure for evolution of resistance to other herbicides, (3) preserve effective herbicide technology, (4) enhance environmental stewardship, (5) safeguard soil conservation gains, and (6) maintain farm profits and productivity. To address these goals, we established three field studies at two sites in the Mid-Atlantic and identified combinations of cover crop and herbicide tactics that achieve effective season-long annual weed management, minimize HR selection pressure, and increase sustainability by reducing herbicide inputs. The first two studies assessed the complementarity of cover crops treatments and herbicide programs in corn and soybean, where integrating a cover crop treatment combined with applying a spring, pre-plant burndown herbicide application as well as a POST-emergent application provided the most effective season-long annual weed control. The third study assessed cover crop treatments and varied management practices, such as planting and termination dates, on HR selection pressure reduction at the time of herbicide applications. While cover crops intercepted a portion of the burndown herbicide application from reaching the soil surface, weeds were effectively controlled by the cover crops before the application, thus reducing the HR selection pressure.
Download or read book Weed Management Systems for Conventional and Glyphosate resistant Soybean Following Rice written by Larry G. Heatherly and published by . This book was released on 2003 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weed Control in Glyphosate resistant Soybean written by Michael L. Weber and published by . This book was released on 1998 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weed Control and Tank mix Interactions in Soybean Resistant to Dicamba Glyphosate and Glufosinate written by Adam Louis Constine and published by . This book was released on 2021 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: XtendFlex® soybean is a new trait platform which confers resistance to three herbicide sites of action that include the active ingredients dicamba, glyphosate, and glufosinate. The ability to use these three herbicides in one system has generated new management questions. Field and greenhouse experiments were conducted in 2019 and 2020 to: 1) investigate weed control systems in conventional and no-tillage XtendFlex® soybean, and 2) identify any antagonistic or synergistic responses from herbicide-tank mixtures used in this system. Control of glyphosate-resistant (GR) waterhemp was optimized with PRE flumioxazin followed by (fb) POST glufosinate or dicamba alone or in combination with each other or glyphosate. Two-pass POST systems also controlled GR waterhemp as long as dicamba and/or glufosinate was used in each application. GR horseweed control was exceptional with all herbicide programs evaluated, except glyphosate alone EPOS or POST. Annual grass control was reduced with EPOS and POST glufosinate + dicamba tank-mixtures. In contrast, this combination was often additive or synergistic for both broadleaf and grass weed control in the greenhouse. Several glyphosate + glufosinate combinations were antagonistic, especially with broadleaf weeds. Dicamba + glyphosate was often antagonistic in the greenhouse but was additive or synergistic for GR waterhemp and GR horseweed control in the field. Antagonisms were often observed when all three herbicides were applied together; however, not all antagonisms resulted in poor control. This research provides growers insight into management strategies for various agronomically important weeds in XtendFlex® soybean. .
Download or read book Soybean Response and Weed Control with Flumioxazin and Sorption Degradation and Weed Control with Isoxaflutole written by Sarah Taylor Lovell and published by . This book was released on 2000 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weed Management Yield and Economic Return on Investment of Six Soybean Systems in Conventional and No till written by Matthew C. Geiger and published by . This book was released on 2018 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shifts toward herbicide resistant weed populations in row crop agriculture is a widespread epidemic. Sequential applications of EPSPS synthase-inhibitors, acetolactate synthase-inhibitors, and other herbicide site-of-action groups, have led to the selection and spread of herbicide-resistant weed biotypes (Powles, 2008; Tranel and Wright, 2002). New soybean systems with resistance to auxin herbicides, along with proprietary herbicide formulations, have been developed to control these herbicide-resistant weeds in soybean production. These new technologies will be compared in both conventional- and no-till with technologies which have been available for several years, in the aspects of weed control, yield, and economic return on investment (EROI). In both 2016 and 2017, when using preemergence (PRE) followed by postemergence (POST) herbicide programs, there were few differences in weed control between the six soybean systems. Adequate grain yield was provided by all soybean systems when proper herbicide programs were used. EROI was the highest when optimum yields were achieved, regardless of treatment cost.
Download or read book Utilization of Weed Ecology Tank Mixtures and Application Technology to Improve Efficacy of Herbicide Applications in Soybean written by Christopher John Meyer and published by . This book was released on 2015 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: New herbicide-resistant soybean traits will increase the number of herbicides that can be applied in soybean and change the technology currently used to make herbicide applications in soybean. Palmer amaranth (Amaranthus palmeri) remains one of the most difficult weeds to manage in soybean and thus is the primary focus of this research. Therefore, experiments were conducted to investigate Palmer amaranth temporal emergence, control of common Arkansas weeds with new soybean herbicide programs, and the effect of application technology on dicamba-containing tank mixtures. Palmer amaranth emergence exceeded 400 plants m-2 for tillage treatments in 2013 and 2014, and tillage events typically increased emergence compared to no-tillage. The addition of isoxaflutole and mesotrione (HPPD-inhibitors) to soybean herbicide programs PRE improved control more than dicamba or 2,4-D (synthetic auxins) PRE. Herbicide programs that included HPPD-inhibitors EPOST improved control of Palmer amaranth more than programs with synthetic auxins. However, synthetic auxins applied LPOST controlled Palmer amaranth better than HPPD-inhibitors LPOST. Herbicide programs that included synthetic auxins or HPPD-inhibitors improved control of pitted morningglory but did not improve control of prickly sida and barnyardgrass compared to current standard herbicide programs. Applicator-controlled variables such as nozzle selection, spray volume, and groundspeed did not affect the efficacy of many dicamba-containing tank mixtures investigated. However, a tank mixture of the products Roundup PowerMax + Engenia produced an antagonistic effect on large barnyardgrass. Additionally, Palmer amaranth and barnyardgrass control was higher at 187 L ha-1 for Engenia + Roundup for the TTI nozzle than at 94 L ha-1. These results show that new technologies will improve control of some weeds in soybean, but the new technologies need to be applied using effective spray nozzles and spray volumes.
Download or read book S metolachlor written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Glyphosate Resistance in Crops and Weeds written by Vijay K. Nandula and published by John Wiley & Sons. This book was released on 2010-12-28 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: New technologies are becoming available for managing glyphosate resistant (GR) weeds and reducing their spread. GR crop technology has revolutionized crop production in the developed world and the benefits are gradually spilling over to the developing world. In order to sustain an effective, environmentally safe herbicide such as glyphosate and the GR crop technology well in to the future, it is imperative that the issue of GR weeds be comprehensively understood. This book provides such an essential, up-to-date source of information on glyphosate resistance for researchers, extension workers, land managers, government personnel, and other decision makers. Provides comprehensive coverage of the intensely studied topic of glyphosate resistant (GR) in crops Details the development of glyphosate resistance and how to detect and manage the problem in crops Helps standardize global approaches to glyphosate resistance Encompasses interdisciplinary approaches in chemistry, weed science, biochemistry, plant physiology, plant biotechnology, genetics, ecology Includes a chapter on economic analysis of GR impact on crops
Download or read book Agronomic and Pest Interactions in No till Corn and Soybean Wih Fall Versus Spring Herbicide Applications written by Nicholas Monnig and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fall herbicide applications have increased in popularity in recent years. Little is known of how fall herbicide applications impact soil conditions, insect populations, and winter and summer annual weed populations. Few studies have directly compared fall herbicide applications to early spring applications. Therefore, field experiments were conducted in both no-till corn and soybean fields from 2004 through 2006 in central, northwest, and northeast Missouri. Herbicide applications were made in the fall and at three spring timings. Two residual and one non-residual herbicide treatment were applied at each of the four timings. Removal of winter annual weeds with the three herbicide treatments led to an increase in soil moisture just after planting, and a decrease in insect populations and feeding well after planting. Measurements of soil temperature indicated that removing winter annual weeds could increase temperatures in the spring. Fall residual herbicide treatments provided the highest level of winter annual weed control, yet provided poor control of summer annual weed species after planting. Residual herbicide applications made at the last spring timing provided the highest level of summer annual weed control, yet provided poor winter annual weed control at planting. Residual herbicide applications made one to two months prior to planting offered the best balance between winter and summer annual weed control. Based on the results of these experiments, no-till corn and soybean producers can obtain maximum weed control and planting conditions by applying a residual herbicide in the early spring rather than the.
Download or read book Influence of Herbicide Programs Weed Height and Glufosinate and 2 4 D Combinations on Weed Management in Soybean Resistant to 2 4 D written by Brett Douglass Craigmyle and published by . This book was released on 2012 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: The introduction of transgenic crops with resistance to 2,4-D will provide growers with new weed management options in soybean. To better understand the utility of this technology in soybean production systems, field and greenhouse experiments were conducted in 2010 and 2011 to investigate the effects of herbicide programs, weed height, and compatibility of glufosinate and 2,4-D combinations on weed control in soybeans with resistance to 2,4-D and glufosinate. Overall, results from these experiments indicate that glufosinate plus 2,4-D combinations utilized in pre-emergence (PRE) followed by post-emergence (POST) or sequential POST programs can provide increased control of problematic weeds like Asiatic dayflower and common waterhemp, while providing similar grass control as herbicide programs that contain glufosinate alone. Reductions in weed control were observed in response to increased weed heights, along with single POST applications of either glufosinate or 2,4-D alone. Soybean yields were also reduced by approximately 3% in response to POST applications made to 30- to 35-cm compared to 10- to 15-cm weeds.
Download or read book Optimum GAT Concepts written by Nicholas V. Hustedde and published by . This book was released on 2011 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimum® GAT® enabled herbicide concepts can improve control of some problematic weed species, including some glyphosate-resistant weed populations, compared to current herbicide tactics that rely primarily on glyphosate for weed control in commercial glyphosate-resistant soybean and corn. However, the integration of postemergence soybean herbicides beyond the ALS chemistry is necessary to provide a broader spectrum of weed control when considering the challenges of managing both glyphosate- and ALS-resistant weed species that are becoming more frequent in commercial fields.
