Horseweed [Conyza Canadensis (l.) Cronq.] Management in No-tillage Soybean Production PDF Download

Author: Joseph A. Bruce
Publisher:
ISBN:
Category : Herbicides
Languages : en
Pages : 182

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Author: Thomas William Eubank
Publisher:
ISBN:
Category : Canadian horseweed
Languages : en
Pages :

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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.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
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.

Author: Bryan P. Reeb
Publisher:
ISBN:
Category : Canadian horseweed
Languages : en
Pages : 58

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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.

Author: Austin Sherman
Publisher:
ISBN:
Category :
Languages : en
Pages : 109

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Author: Andi Marie Christenson
Publisher:
ISBN:
Category :
Languages : en
Pages :

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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.

Author:
Publisher:
ISBN:
Category : Weeds
Languages : en
Pages : 876

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Author: Alyssa Lamb
Publisher:
ISBN:
Category : Canadian horseweed
Languages : en
Pages : 118

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Book Description
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.

Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 808

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Author:
Publisher: UCANR Publications
ISBN: 1601077815
Category :
Languages : en
Pages : 9

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Book Description
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.