Evaluation Of Herbicide Programs For The Management Of Glyphosate Resistant Giant Ragweed In Soybean

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Evaluation of Herbicide Programs for the Management of Glyphosate-resistant Giant Ragweed in Soybean

Author : Eric Brandon Riley
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (876 download)

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Book Synopsis Evaluation of Herbicide Programs for the Management of Glyphosate-resistant Giant Ragweed in Soybean by : Eric Brandon Riley

Download or read book Evaluation of Herbicide Programs for the Management of Glyphosate-resistant Giant Ragweed in Soybean written by Eric Brandon Riley and published by . This book was released on 2013 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, glyphosate-resistant (GR) giant ragweed (Ambrosia trifida L.) has become an increasingly problematic weed of soybean production systems in Missouri and throughout the Midwest. As of 2013, giant ragweed has been confirmed with resistance to glyphosate in 11 states and one Canadian province. The objectives of this research were to determine the effect of herbicide application timing and glyphosate tank-mix combinations on the survival of GR giant ragweed and the influence of pre-plant (PREPLT) followed by (fb) 2-pass post-emergence (POST) herbicide programs in GR and glufosinate-resistant soybean on GR giant ragweed density, soybean yield, and net economic return. Results from this research indicate that POST applications to smaller plants can reduce the survival of giant ragweed compared to applications to larger plants. For a POST only management strategy, fomesafen plus glyphosate applied to 10-cm plants fb glyphosate late post-emergence (LPOST) resulted in 37% survival and was the lowest survival observed. Overall, giant ragweed was nearly eliminated with PREPLT fb 2-pass POST programs. For example, no more than 6 plants 5-m-2 were observed if PREPLT applications contained an effective tank-mix combination in either soybean system. However, 244 plants 5-m-2 were observed following a program that consisted of glyphosate PREPLT fb glyphosate plus fomesafen early post-emergence (EPOST) fb glyphosate LPOST. Few differences in yield or net return were observed in the PREPLT experiments. However, programs that contained an effective PREPLT application generally resulted in higher yield and net economic return. Results from this research indicate that PREPLT applications can provide more effective control of giant ragweed compared to POST-only programs.

Utilization of Dicamba for the Control of Glyphosate-resistant Giant Ragweed (Ambrosia Trifida L.) and Waterhemp (Amaranthus Rudis Sauer.)

Download Utilization of Dicamba for the Control of Glyphosate-resistant Giant Ragweed (Ambrosia Trifida L.) and Waterhemp (Amaranthus Rudis Sauer.) PDF Online Free

Author : Douglas J. Spaunhorst
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (889 download)

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Book Synopsis Utilization of Dicamba for the Control of Glyphosate-resistant Giant Ragweed (Ambrosia Trifida L.) and Waterhemp (Amaranthus Rudis Sauer.) by : Douglas J. Spaunhorst

Download or read book Utilization of Dicamba for the Control of Glyphosate-resistant Giant Ragweed (Ambrosia Trifida L.) and Waterhemp (Amaranthus Rudis Sauer.) written by Douglas J. Spaunhorst and published by . This book was released on 2013 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soybean varieties that are resistant to the herbicide glyphosate now comprise the majority of soybean acres planted in the U.S. In the past ten to fifteen years, glyphosate has been used as the primary herbicide for post-emergence control of problematic weeds such as giant ragweed or waterhemp. Continuous use of glyphosate for weed control has resulted in the selection of weeds that are naturally resistant to glyphosate. Soybean varieties resistant to the herbicide dicamba are currently under development by Monsanto and are intended to provide growers with additional options for the control of glyphosate-resistant (GR) broadleaf weeds and to delay the spread of GR weed biotypes. The objectives of these experiments were to: 1) determine the influence of application timing, dicamba rate, dicamba plus glyphosate combinations, and sequential dicamba applications on the visual control and biomass reduction of GR giant ragweed and GR waterhemp, and 2) to evaluate herbicide programs for the management of GR giant ragweed and GR waterhemp in dicamba-resistant (DR) soybean. Results from these experiments suggest dicamba effectively controls GR giant ragweed. Conversely, the results suggest control of GR waterhemp with dicamba is considerably less effective. However, acceptable GR waterhemp control was observed with a variety of herbicide programs utilized in DR soybean.

Biology and Control of Glyphosate-resistant Giant Ragweed

Author : Simranpreet Kaur
Publisher :
ISBN 13 :
Total Pages : 119 pages
Book Rating : 4.:/5 (96 download)

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Book Synopsis Biology and Control of Glyphosate-resistant Giant Ragweed by : Simranpreet Kaur

Download or read book Biology and Control of Glyphosate-resistant Giant Ragweed written by Simranpreet Kaur and published by . This book was released on 2015 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Giant ragweed is a troublesome, early emerging, summer annual weed found throughout the eastern and midwestern corn and soybean growing regions of the United States. Since the emergence of giant ragweed varies at different locations, our first objective was to determine the emergence pattern of giant ragweed in Nebraska and how spring tillage influences emergence. Results of a two-year study suggested that giant ragweed emerged from late March until mid-June, with the majority of emergence ceasing by early May. Spring tillage could be used as an alternative method for managing glyphosate resistant giant ragweed. Water stress can affect the growth and development of both crop plants and weeds. Thus, in our second objective, we hypothesized that drought conditions can result in a water deficit that can hinder giant ragweed growth and reproduction. Results suggested that the degree of water stress had more effect on plant growth and fecundity compared to the duration of water stress. Plants watered at a 10-day interval with 100% field capacity were still able to produce seeds, whereas only a few plants survived at 12.5% soil moisture content when irrigated at a 2-day interval. Early emergence and a rapid growth rate make giant ragweed a competitive weed early in the season and reduce crop yields; therefore, in our third objective, we determined the early spring control of giant ragweed using a preplant herbicide. Several herbicide programs were investigated with preplant followed by pre-emergence (PRE) and post-emergence (POST) herbicides for controlling glyphosate-resistant giant ragweed in glufosinate-resistant soybean. Results suggested that herbicide programs containing 2,4-D in preplant followed by an in-crop application of glufosinate provided 99% control of glyphosate-resistant giant ragweed and increased soybean yields. Finally, since fall and early spring application of herbicides may influence giant ragweed emergence, our fourth objective was to determine the effect of fall and/or early spring application of a prepackaged mixture of iodosulfuron and thiencarbazone-methyl applied alone or tank-mixed with 2,4-D, dicamba, or metribuzin on glyphosate-resistant giant ragweed in no-till corn. Results suggested that the premix of iodosulfuron and thiencarbazone-methyl tank-mixed with 2,4-D, dicamba, or metribuzin followed by PRE and POST herbicide applications provided > 95% control of glyphosate-resistant giant ragweed in no-till corn.

Characterization and Management of Glyphosate-resistant Giant Ragweed (Ambrosia Trifida L.) and Horseweed [Conyza Canadensis (L.) Cronq.]

Author : Jeff Michael Stachler
Publisher :
ISBN 13 :
Total Pages : 107 pages
Book Rating : 4.:/5 (256 download)

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Book Synopsis Characterization and Management of Glyphosate-resistant Giant Ragweed (Ambrosia Trifida L.) and Horseweed [Conyza Canadensis (L.) Cronq.] by : Jeff Michael Stachler

Download or read book Characterization and Management of Glyphosate-resistant Giant Ragweed (Ambrosia Trifida L.) and Horseweed [Conyza Canadensis (L.) Cronq.] written by Jeff Michael Stachler and published by . This book was released on 2008 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research confirms the presence of low-level glyphosate resistance in giant ragweed, and multiple-resistance in horseweed, to glyphosate and ALS-inhibiting herbicides. This is the first confirmation of these resistant cases in the world. Resistant populations can be effectively managed where the herbicide program includes 2,4-D and residual herbicides, applied prior to soybean planting at the appropriate weed growth stage. For giant ragweed, the preplant herbicide treatment must be followed by multiple postemergence applications of glyphosate at maximum rates, or effective alternatives to glyphosate.

Management of Glyphosate-resistant Palmer Amaranth (amaranth Palmeri S. Watson) in Dicamba/glyphosate-resistant Soybean

Author : Shawn Thomas McDonald
Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.:/5 (126 download)

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Book Synopsis Management of Glyphosate-resistant Palmer Amaranth (amaranth Palmeri S. Watson) in Dicamba/glyphosate-resistant Soybean by : Shawn Thomas McDonald

Download or read book Management of Glyphosate-resistant Palmer Amaranth (amaranth Palmeri S. Watson) in Dicamba/glyphosate-resistant Soybean written by Shawn Thomas McDonald and published by . This book was released on 2021 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: While not a historically problematic weed in Nebraska, Palmer amaranth has become increasingly problematic in many agronomic cropping systems. Throughout the state, several cohorts of Palmer amaranth have been found resistant to several different sites of action. Of major concern is a population found resistant to glyphosate the most common post-emergence herbicide in Nebraska. As chemical control methods are the most common forms of weed control throughout the state methods alternatives or enhancements are highly desired. Two field experiments were conducted in 2018 and 2019 at a grower's field near Carleton, Nebraska with the objectives to evaluate the effects of row spacing and herbicide programs and separately analyze the effect of overlapping residual herbicides on control of glyphosate-resistant (GR) Palmer amaranth, gross profit margin, and benefit-cost ratios of these herbicide programs. Evaluation of the effect on row spacing found no significant effect of narrowing row spacing on control, density, or biomass reduction of GR Palmer amaranth across all herbicide programs. Herbicide program had a higher impact on GR Palmer amaranth control with all PRE fb EPOST except dicamba + chlorimuron/flumioxazin followed by dicamba and all PRE fb EPOST+RH providing greater than 85% control from 14 d after EPOST (DAEPOST) to 36 DAEPOST. Evaluation of overlapping residual herbicides on management of GR Palmer amaranth found that flumioxazin/pyroxasulfone/metribuzin provided 78% to 82% control from 14 DAEPOST to 70 DAEPOST in 2018 and 94% to 98% in 2019. Addition of dicamba + acetochlor EPOST to flumioxazin/pyroxasulfone/metribuzin provided 83% to 96% from 14 DAEPOST to 70 DAEPOST in 2018 and 99% in 2019. As the adoption of new application technologies, herbicide-resistant crops, and alternative weed control methods change with the times, surveys provide insight into changes in weed dynamics and crop production over time. Conducting multiple surveys over the course of several years provides a vital framework in developing future research and extension outreach. During the winter of 2019-2020, a survey of Nebraska stakeholders was carried to quantify crop production, weed control, and management practices throughout the state. In order of importance, Palmer amaranth, horseweed, common waterhemp, kochia, and giant ragweed were ranked the most problematic weeds statewide. Based on survey responses, 27% of respondents, cited integrated weed management systems as the primary concern for future research and extension outreach for the state of Nebraska.

Are Superweeds An Outgrowth of USDA Biotech Policy? (Part I), Serial No. 111-158, July 28, 2010, 111-2 Hearing, *

Author :
Publisher :
ISBN 13 :
Total Pages : 332 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Are Superweeds An Outgrowth of USDA Biotech Policy? (Part I), Serial No. 111-158, July 28, 2010, 111-2 Hearing, * by :

Download or read book Are Superweeds An Outgrowth of USDA Biotech Policy? (Part I), Serial No. 111-158, July 28, 2010, 111-2 Hearing, * written by and published by . This book was released on 2011 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Economics of Glyphosate Resistance Management in Corn and Soybean Production

Author : Michael Livingston
Publisher : CreateSpace
ISBN 13 : 9781512272161
Total Pages : 52 pages
Book Rating : 4.2/5 (721 download)

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Book Synopsis The Economics of Glyphosate Resistance Management in Corn and Soybean Production by : Michael Livingston

Download or read book The Economics of Glyphosate Resistance Management in Corn and Soybean Production written by Michael Livingston and published by CreateSpace. This book was released on 2015-05-21 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glyphosate, known by many trade names, including Roundup, is a highly effective herbicide. Widespread glyphosate use for corn and soybean has led to glyphosate resistance, which is now documented in 14 weed species affecting U.S. cropland, and recent surveys suggest that acreage with glyphosate-resistant (GR) weeds is expanding. Data from USDA's Agricultural Resource Management Survey (ARMS), along with the Benchmark Study (conducted independently by plant scientists), are used to address several issues raised by the spread of GR weeds. Choices made by growers that could help manage glyphosate resistance include using glyphosate during fewer years, combining it with one or more alternative herbicides, and, most importantly, not applying glyphosate during consecutive growing seasons. As a result, managing glyphosate resistance is more cost effective than ignoring it, and after about 2 years, the cumulative impact of the returns received is higher when managing instead of ignoring resistance.

Integration of Cultural Practices and Herbicide-resistant Crop Technologies for the Management of Glyphosate-resistant Waterhemp in Soybean

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Author : John Lawrence Schultz
Publisher :
ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.:/5 (978 download)

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Book Synopsis Integration of Cultural Practices and Herbicide-resistant Crop Technologies for the Management of Glyphosate-resistant Waterhemp in Soybean by : John Lawrence Schultz

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.

Evaluation of Glyphosate Resistant Giant Ragweed (Ambrosia Trifida) in Ohio Soybean (Glycine Max) Fields

Author : James D. Bethel
Publisher :
ISBN 13 :
Total Pages : 71 pages
Book Rating : 4.:/5 (856 download)

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Book Synopsis Evaluation of Glyphosate Resistant Giant Ragweed (Ambrosia Trifida) in Ohio Soybean (Glycine Max) Fields by : James D. Bethel

Download or read book Evaluation of Glyphosate Resistant Giant Ragweed (Ambrosia Trifida) in Ohio Soybean (Glycine Max) Fields written by James D. Bethel and published by . This book was released on 2013 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Driving surveys were conducted in 2011 and 2012 to determine spatial distribution of giant ragweed infestations across the state of Ohio. Infested fields accounted for approximately 4% of fields surveyed, and occurred in 50 to 67% of counties surveyed. Results of the surveys indicated that giant ragweed infestations were localized occurrences, spread throughout the state. Infested counties appeared to be distributed in north-central and west-central Ohio.

Evaluation of Glyphosate and PPO-inhibiting Herbicide Tank-mixtures to Manage Glyphosate Resistance in Soybean

Author : Jesaelen Gizotti de Moraes
Publisher :
ISBN 13 :
Total Pages : 93 pages
Book Rating : 4.:/5 (16 download)

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Book Synopsis Evaluation of Glyphosate and PPO-inhibiting Herbicide Tank-mixtures to Manage Glyphosate Resistance in Soybean by : Jesaelen Gizotti de Moraes

Download or read book Evaluation of Glyphosate and PPO-inhibiting Herbicide Tank-mixtures to Manage Glyphosate Resistance in Soybean written by Jesaelen Gizotti de Moraes and published by . This book was released on 2018 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: Protoporphyrinogen oxidase (PPO)-inhibiting herbicides in combination with glyphosate for postemergence (POST) applications is one of the primary alternatives to manage glyphosate-resistant weeds and the only effective POST chemical option in conventional and glyphosate-tolerant soybean to control glyphosate and ALS-inhibiting resistant weeds. Antagonistic interactions have been reported between many different herbicide modes of action and optimal droplet size may be affected by tank-mixtures of different herbicides. Additionally, the impact of adjuvants on the factors aforementioned as well as on physical properties needs to be thoroughly investigate to maximize herbicide efficacy. Therefore, the objectives of this research were to: 1) conduct greenhouse and field studies to evaluate the impact of glyphosate and PPO-inhibiting herbicides (fomesafen or lactofen) applied alone and in tank mixtures on weed control, optimal droplet size, drift potential, and tank mixture interactions, 2) determine the influence of adjuvants on tank mixtures interactions, spray droplet-spectra, drift potential, and physical properties, (3) determine if herbicide efficacy (and thereby, weed control) is correlated to reduced surface tension and contact angle. Overall, applications from the tank mixtures resulted in antagonistic interactions and some of them were overcame by the addition of adjuvants. Droplet size and percent volume of droplets ≤ 150 μm were highly affected by nozzle type and spray solution. The oil based formulation of lactofen and crop oil concentrates were shattered by TTI nozzles due to its internal turbulence chamber creating smaller droplets and increasing driftable fines. The impact of nozzle selection on weed control was minimal and larger droplets at the rates and carrier volume used in this study could be used without compromising herbicide efficacy reducing drift potential. Adjuvants reduced the surface tension and contact angle of spray solutions; however, herbicide efficacy was only partially explained by the changes in these physical properties. Results emphasized the importance of better understanding the relationship among application variables and weed species. In addition, recommendations should be herbicide- and weed-specific in order to optimize herbicide applications and to maintain herbicide effectiveness.

Integrated Weed Management and Herbicide Application Parameters for Herbicide-resistant Soybean in Kansas

Author : Chad Joseph Lammers
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)

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Book Synopsis Integrated Weed Management and Herbicide Application Parameters for Herbicide-resistant Soybean in Kansas by : Chad Joseph Lammers

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.

The Economics of Glyphosate Resistance Management in Corn and Soybean Production

Author : Michael J. Livingston
Publisher :
ISBN 13 :
Total Pages : 45 pages
Book Rating : 4.:/5 (91 download)

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Book Synopsis The Economics of Glyphosate Resistance Management in Corn and Soybean Production by : Michael J. Livingston

Download or read book The Economics of Glyphosate Resistance Management in Corn and Soybean Production written by Michael J. Livingston and published by . This book was released on 2015 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glyphosate, known by many trade names, including Roundup, is a highly effective herbicide. Widespread glyphosate use for corn and soybean has led to glyphosate resistance, which is now documented in 14 weed species affecting U.S. cropland, and recent surveys suggest that acreage with glyphosate-resistant (GR) weeds is expanding. Data from USDA's Agricultural Resource Management Survey (ARMS), along with the Benchmark Study (conducted independently by plant scientists), are used to address several issues raised by the spread of GR weeds. Choices made by growers that could help manage glyphosate resistance include using glyphosate during fewer years, combining it with one or more alternative herbicides, and, most importantly, not applying glyphosate during consecutive growing seasons. As a result, managing glyphosate resistance is more cost effective than ignoring it, and after about 2 years, the cumulative impact of the returns received is higher when managing instead of ignoring resistance.

Herbicide Resistance in Weeds: Early Detection, Mechanisms, Dispersal, New Insights and Management Issues

Author : Ilias Travlos
Publisher : Frontiers Media SA
ISBN 13 : 2889660060
Total Pages : 329 pages
Book Rating : 4.8/5 (896 download)

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Book Synopsis Herbicide Resistance in Weeds: Early Detection, Mechanisms, Dispersal, New Insights and Management Issues by : Ilias Travlos

Download or read book Herbicide Resistance in Weeds: Early Detection, Mechanisms, Dispersal, New Insights and Management Issues written by Ilias Travlos and published by Frontiers Media SA. This book was released on 2020-10-28 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.

Dynamics of Early-season Weed Management and Soybean Nutrition

Author : Nick T. Harre
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (91 download)

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Book Synopsis Dynamics of Early-season Weed Management and Soybean Nutrition by : Nick T. Harre

Download or read book Dynamics of Early-season Weed Management and Soybean Nutrition written by Nick T. Harre and published by . This book was released on 2014 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: The popularity of growers using only postemergence (POST) herbicides for weed management in soybean was enabled by the commercialization of glyphosate-resistant soybean. Field experiments were conducted across four sites throughout southern Illinois in 2012 and 2013 to study the influence of early-season weed management strategies on soybean nutrient accumulation, grain yield parameters, and the acquisition of nutrients by broadleaved and grass weeds. Increasing periods of weed competition duration were established by removing weeds at heights of 10, 20, 30 or 45 cm with glyphosate. A weed-free treatment utilizing a comprehensive soil residual and POST herbicide program was included to implement a weed-free comparison. Two standard herbicide management strategies that simulate common grower practices were also evaluated for comparison: flumioxazin PRE followed by glyphosate POST and two sequential POST glyphosate applications. Averaged across all 11 mineral nutrients analyzed in this experiment, broadleaved weeds accumulated 149 and 108% more nutrients than grasses in 2012 and 2013, respectively. Competition from 20-cm weeds reduced the acquisition of N, P, Ca, Mg, S, Fe, B, Cu, and Zn by soybean in 2012; these nutrients in addition to K and Mn were reduced by the same level of competition in 2013. N and Fe were the nutrients in soybean most notably impacted by weed interference. Reductions in soybean grain yield were the result of competition with 30-cm weeds in 2012, and 10-cm weeds in 2013; while, both standard herbicide regimens yielded less than the weed-free treatment in 2013 only. Additionally in 2013, average soybean seed weight and grain oil content was reduced when weeds were not removed before a height of 10 and 20 cm, respectively. The rate of decomposition and nutrient release was measured for waterhemp and giant foxtail desiccated by glyphosate at heights of 10, 20, 30, and 45 cm in two southern Illinois soybean fields. Weed biomass was grown under greenhouse conditions to ensure homogeneity and litterbag methodology was utilized to track in situ mass and nutrient losses, expressed as a decay constant (k) regressed over time according to the single exponential decay model. The effect of specie and height both had a strong influence on the intrinsic properties of the weed biomass and the associated rate of decay. Concentrations of the recalcitrant cell wall components (cellulose, hemicellulose, and lignin) were generally greatest as weed height (plant age and development) increased and with giant foxtail compared with waterhemp. Ca, Mg, and S concentrations were greater in waterhemp, while N was greater in giant foxtail. N and K concentrations decreased with increasing weed height. After 16 weeks, 10-cm waterhemp and giant foxtail detritus had lost 10 and 12% more mass compared to the 45-cm height. Decomposition rates revealed mass loss was highest for 10-cm waterhemp (kD = 0.022) and lowest for 45-cm giant foxtail (kD = 0.011) and this process was negatively correlated to the overall amount of cell wall constituents (r = -0.73). Nutrient release rates followed a similar trend in that shorter (younger) weeds and waterhemp liberated nutrients more readily. Across all tested plant material, K was the nutrient most rapidly released, whereas, Ca was the most strongly retained nutrient. Although the pressing challenge of managing herbicide-resistant weeds justifies the implementation of early-season weed control tactics, this research suggests there are ancillary benefits that are provided by this strategy. The use of a robust, broad-spectrum soil residual herbicide program in conjunction with timely POST applications provides the foundation for early-season weed management, thereby minimizing non-crop nutrient use and enhancing the nutrient acquisition capacity in soybean. This strategy facilitates more sustainable crop production by requiring fewer supplemental nutritional inputs while also protecting grain yield. (Abstract shortened by UMI.)

Evaluation of Halauxifen-methyl for the Control of Glyphosate-Resistant Canada Fleabane (Conyza Canadensis (L.) Cronq.) and Giant Ragweed (Ambrosia Trifida L.) in Winter Wheat and Soybean

Download Evaluation of Halauxifen-methyl for the Control of Glyphosate-Resistant Canada Fleabane (Conyza Canadensis (L.) Cronq.) and Giant Ragweed (Ambrosia Trifida L.) in Winter Wheat and Soybean PDF Online Free

Author : Jessica E. Quinn
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Evaluation of Halauxifen-methyl for the Control of Glyphosate-Resistant Canada Fleabane (Conyza Canadensis (L.) Cronq.) and Giant Ragweed (Ambrosia Trifida L.) in Winter Wheat and Soybean by : Jessica E. Quinn

Download or read book Evaluation of Halauxifen-methyl for the Control of Glyphosate-Resistant Canada Fleabane (Conyza Canadensis (L.) Cronq.) and Giant Ragweed (Ambrosia Trifida L.) in Winter Wheat and Soybean written by Jessica E. Quinn and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The new herbicide halauxifen-methyl was evaluated for the control of glyphosate-resistant (GR) Canada fleabane and giant ragweed in winter wheat and soybean, and the tolerance of corn and soybean to halauxifen-methyl. Halauxifen-methyl applied alone or in a tankmix controlled GR Canada fleabane in winter wheat, while a tankmix partner was required to provide control in soybean. Halauxifen-methyl applied alone did not control GR giant ragweed in winter wheat or soybean, however, when applied in a tankmix, control was achieved. Halauxifen-methyl applied preplant and pre-emergence at 5 g ai ha-1 and 10 g ai ha-1 was safe in corn however yield was reduced when applied early postemergence at the 10 g ai ha-1 rate. Soybean was extremely sensitive to halauxifen-methyl applied early postemergence at both rates, however minimal injury was observed when either rate was applied preplant and pre-emergence. Halauxifen-methyl could provide an effective solution for the control of GR weeds in corn, soybean and winter wheat.

Glyphosate with and Without Residual Herbicides in No-till Glyphosate Resistant Soybeans

Author : Karen Ann Corrigan
Publisher :
ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (89 download)

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Book Synopsis Glyphosate with and Without Residual Herbicides in No-till Glyphosate Resistant Soybeans by : Karen Ann Corrigan

Download or read book Glyphosate with and Without Residual Herbicides in No-till Glyphosate Resistant Soybeans written by Karen Ann Corrigan and published by . This book was released on 1999 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Weed Control and Tank-mix Interactions in Soybean Resistant to Dicamba, Glyphosate, and Glufosinate

Author : Adam Louis Constine
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.7/5 (386 download)

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Book Synopsis Weed Control and Tank-mix Interactions in Soybean Resistant to Dicamba, Glyphosate, and Glufosinate by : Adam Louis Constine

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. .