Download or read book Horseweed Conyza Canadensis l Cronq Management in No tillage Soybean Production written by Joseph A. Bruce and published by . This book was released on 1989 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Field Emergence of Horseweed Conyza Canadensis L Cronq and Control Utilizing Tillage and Herbicides written by Thomas William Eubank and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Horseweed has been documented in 70 countries and 40 different crops around the world and is listed as being a problem weed in no-till production systems. Horseweed has developed resistance to many herbicide modes of action including glycine. Field experiments were conducted from 2004 to 2006 in the Mississippi Delta to evaluate the field emergence of horseweed and most effective treatment programs for its control. Field emergence of horseweed was observed occurring primarily in the fall of the year, September through early November, when temperatures were between 15.6 to 23.4 C with later flushes occurring from late January through early April with temperatures ranging from 5.2 to 16 C. Tillage in September followed by herbicide in March gave 100% control of horseweed across all locations. Glyphosate + 2,4-D and glyphosate + dicamba were the best glyphosate-based treatments and provided 90% or better horseweed control 4 WAT both years. Glufosinate-based burndowns provided 81 to 97% horseweed control and soybean yields were generally similar with all glufosinate-based programs.

Download or read book FIELD EMERGENCE OF HORSEWEED Conyza Canadensis L Cronq AND CONTROL UTILIZING TILLAGE AND HERBICIDES written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Horseweed has been documented in 70 countries and 40 different crops around the world and is listed as being a problem weed in no-till production systems. Horseweed has developed resistance to many herbicide modes of action including glycine. Field experiments were conducted from 2004 to 2006 in the Mississippi Delta to evaluate the field emergence of horseweed and most effective treatment programs for its control. Field emergence of horseweed was observed occurring primarily in the fall of the year, September through early November, when temperatures were between 15.6 to 23.4 C with later flushes occurring from late January through early April with temperatures ranging from 5.2 to 16 C. Tillage in September followed by herbicide in March gave 100% control of horseweed across all locations. Glyphosate + 2,4-D and glyphosate + dicamba were the best glyphosate-based treatments and provided 90% or better horseweed control 4 WAT both years. Glufosinate-based burndowns provided 81 to 97% horseweed control and soybean yields were generally similar with all glufosinate-based programs.

Download or read book A Systems Approach to Conyza Canadensis Management written by Bryan P. Reeb and published by . This book was released on 2018 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Ohio, no-tillage soybean production, glyphosate, and acetolactate synthase inhibitor (ALS)-inhibiting herbicides are common components for management of horseweed. However, resistance to glyphosate was confirmed in Ohio in 2002, followed by multiple resistance to both ALS inhibitors and glyphosate in 2003. Field studies were conducted from the fall of 2009 through the summer of 2016 to develop strategies for management of horseweed populations with these types of resistance in no-tillage soybeans. The objectives were to: 1) determine the efficacy of fall-applied herbicides for management of horseweed emerging in the spring; 2) determine the effect of spring application timing and herbicide on the residual control of horseweed through mid-summer; and 3) determine the most effective herbicide program for soybeans resistant to glufosinate, glyphosate/dicamba, or to glyphosate/glufosinate/2,4-D.

Download or read book Integrating Cover Crops and Herbicides for Horseweed Conyza Canadensis L Cronq Management Prior to Soybean Glycine Max L Merr written by Austin Sherman and published by . This book was released on 2019 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Cover Crops for Horseweed Conyza Canadensis L Control Before and During a Soybean Crop written by Andi Marie Christenson and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing numbers of herbicide-resistant weed species require alternative methods of weed suppression to be examined. This study quantified the interaction between various cover crop or herbicide systems and horseweed [Conyza canadensis (L.)] growth. Fall cover crops of winter wheat [Triticum aestivum (L.)], winter rye [Secale cereal (L.)], barley [Hordeum vulgare (L.)] and annual ryegrass [Lolium multiflorum (L.)] were seeded in November 2012 and 2013. Spring cover crop of oat [Avena sativa (L.)] was seeded in April 2013 or rye was seeded in March 2014. All cover crops were no-till seeded into grain sorghum stubble [Sorghum bicolor (L.) Moench]. Four herbicide treatments were fall or spring applied, with and without residual. The spring non-residual treatment was also applied to plots of winter rye. Cover crop plots were split and terminated with a roller crimper or glyphosate application prior to soybean [Glycine max (L.) Merr.] planting to determine the effect of termination method on treatment performance. Soybean was planted in June 2013 and May 2014 and mechanically harvested in October of both years. Horseweed density, biomass accumulation, and soybean yield data were quantified. Horseweed height, whole plant seed production, and seed subsamples were recorded in the untreated fallow control, winter wheat, and winter rye plots in 2014. Horseweed suppression by winter rye approached 90%, levels similar to suppression by herbicide systems. In both years, herbicide plots had less than half the horseweed biomass than any of the cover crop systems. In 2013, soybean yields in herbicide plots were at least 1,500 kg ha−1, nearly more than double yields in cover crop plots. Soybean yields in 2014 were more consistent across treatments; barley and spring rye plots achieved yields equal to or greater than 2,000 kg ha−1. Winter rye and winter wheat reduced horseweed seed production by 60% compared to the untreated fallow control, with no effect on individual seed weight. Seed production varied across plants, with the untreated control producing the greatest number of seeds. Cover crops were successful at reducing horseweed biomass, suppressing horseweed pressure, preserving soybean biomass, and protecting soybean yields when compared to a fallow untreated control.

Download or read book Proceedings of Annual Meeting written by and published by . This book was released on 1985 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Current Status and Control of Horseweed conyza Canadensis in Ohio Soybean glycine Max Production written by Alyssa Lamb and published by . This book was released on 2018 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: A survey was conducted annually from 2013 through 2017 in 49 to 52 counties in Ohio soybean fields to assess the frequency, infestation level, and distribution of horseweed, giant ragweed (Ambrosia trifida), common ragweed (Ambrosia artemisiifolia), and three Amaranthus or 'pigweed’ species. Horseweed was the most frequently encountered species in all years, followed by giant ragweed, pigweeds, and common ragweed, respectively. Horseweed also had the greatest number of infestations (highest density) each year, followed by giant ragweed, common ragweed, and pigweed species, respectively. Spatial cores of interest, or counties identified as having significant levels of horseweed infestations or lack thereof, relative to surrounding counties, were identified in 2013, 2014, 2015 and 2016, but not 2017. However, the lowest total frequency of horseweed occurred in 2017, which coincided with second highest frequency of infestations among years. There was no distinct distribution or pattern of horseweed movement within the state from year to year, but there did seem to be an increase in counties with one to three infested fields over time compared to the early years of the survey where many counties had one or no infested fields. These results suggest that horseweed persists as a common and troublesome threat to Ohio soybean producers, and that growers should still consider making horseweed management a priority when developing weed control programs.

Download or read book Biology and Management of Horseweed and Hairy Fleabane in California written by and published by UCANR Publications. This book was released on 2008 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Horseweed and hairy fleabane are showing increased resistance to chemical controls, including glyphosate. By learning about their biology and other control alternatives, you can do a better job of keeping on top of this pest problem.

Download or read book Masters Abstracts International written by and published by . This book was released on 1990 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Confirmation and Management of Multiple Resistance of Horseweed Conyza Canadensis L Cronq to Glyphosate and Paraquat written by Thomas William Eubank and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Glyphosate-resistant (GR) horseweed has become a major problem in many row crop production systems in the United States. Horseweed is a winter annual weed common in no-till production systems. Fall-applied herbicides were compared with spring-applied treatments for the control of horseweed. In cotton, fall-applied trifloxysulfuron provided similar or greater control of horseweed when compared to spring-applied treatments of glyphosate + dicamba. Cotton yields with fall-applied trifloxysulfuron, clomazone, and flumioxazin were comparable to or better than spring-applied glyphosate + dicamba both years. Fall-applied cloransulam-methyl, flumetsulam, sulfentrazone, and the combination of chlorimuron-ethyl + metribuzin resulted in horseweed control and soybean yields comparable to spring-applied glyphosate + 2,4-D both years. Multiple-resistance to glyphosate and paraquat exists in a horseweed population from Mississippi. Herbicide rates of 0.066 kg ae/ha glyphosate and 0.078 kg ai/ha paraquat were required to reduce susceptible horseweed biomass 50%; whereas, rates of 0.78 kg/ha glyphosate and 0.67 kg/ha paraquat were required to reduce biomass of resistant horseweed to a similar intent. This is the first broadleaf weed species reported as exhibiting multiple-resistance to glyphosate and paraquat. The addition of metribuzin to paraquat improved control of paraquatresistant horseweed. Paraquat at 0.84 kg/ha plus all rates of metribuzin controlled 15-cm tall horseweed at least 90% both years compared to 73% with 0.84 kg/ha paraquat alone. The addition of 1 and 2% methylated seed oil (MSO) to saflufenacil controlled horseweed 91 and 93%, respectively compared to 78% control with saflufenacil alone. The addition of saflufenacil to glyphosate improved control of GR horseweed from 50% to 100% at 21 d after treatment; control of horseweed with the combination of saflufenacil + glyphosate was additive. Saflufenacil did not affect absorption of glyphosate in glyphosate-susceptible horseweed; however, absorption increased in GR horseweed from 36 to 44% at 48 h after treatment with the addition of saflufenacil when compared to glyphosate alone treatments. Overall, the addition of saflufenacil reduced glyphosate translocation in horseweed at least 6%; however, due to the exceptional efficacy of saflufenacil on horseweed these reductions did not reduce control of GR horseweed.

Download or read book WSSA Abstracts written by Weed Science Society of America and published by . This book was released on 1989 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Weed Technology written by and published by . This book was released on 2009 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Crop Sciences written by Amarjit S. Basra and published by CRC Press. This book was released on 1998 with total page 334 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 Proceedings written by North Central Weed Science Society (U.S.) and published by . This book was released on 1990 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Ecologically Based Weed Management written by Nicholas E. Korres and published by John Wiley & Sons. This book was released on 2023-12-07 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ecologically Based Weed Management Protect crop yields and strengthen ecosystems with this essential guide Research into weed management is an increasingly critical component of both environmental stewardship and food production. The potential cost of weed propagation can be measured in crop yield reductions, under-nourished populations, stymied economies, and more. The propagation of herbicide-resistant weed populations means that purely chemical weed management is no longer viable; food production can now be secured only with an ecological approach to weed control. Ecologically Based Weed Management details such approaches and their potential to manage weeds across a range of agricultural and environmental contexts. It emphasizes the deployment of ecological principles to prevent weed infestations, reduce crop losses, and strengthen ecosystems. In a time when growing population and changing climates are placing enormous pressure on global food production, this approach to weed management has never been more vital. Ecologically Based Weed Management readers will also find: A global team of expert contributors to a multidisciplinary approach Detailed discussion of topics like herbicide limitation, integrated weed management, and more Insights pertinent to agriculture, academia, government, industry, and more Ecologically Based Weed Management is ideal for researchers in agriculture chemistry, weed science, agronomy, ecology, and related fields, as well as for regulators and advanced students.