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Glyphosate-resistant Palmer amaranth confirmed in southwest Nebraska
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Glyphosate-resistant Palmer amaranth confirmed in southwest Nebraska
Keyword:
Publish time:
3
rd
May, 2015
Source:
Lincoln, Nebraska, USA
Information collection and data processing: CCM For more information, please
contact us
Glyphosate-resistant Palmer amaranth confirmed in southwest NebraskaGlyphosate-resistant Palmer amaranth confirmed in southwest Nebraska" title="Share this link on Facebook">Lincoln, Nebraska, USAMay 1, 2015Source: CropWatchPalmer amaranth (Amaranthus palmeri S. Wats.) is a dioecious broadleaf annual weed species that has created significant problems for growers in the Mid-South over the past 10 years due to its resistance to glyphosate and its prolific seed production. A single female plant can produce one million seeds, depending on growing condition and competition (Figure 1).Figure 1. A female Palmer amaranth plant in a
corn
field in southcentral Nebraska. This plant has capacity to produce more than half a million seeds.It continues to cause significant problems in the Mid-South and has rapidly spread throughout the Midwest. As of 2015, glyphosate-resistant Palmer amaranth has been confirmed in Georgia, North Carolina, Arkansas, Tennessee, South Carolina, New Mexico, Mississippi, Alabama, Missouri, Louisiana, Illinois, Ohio, Kentucky, Michigan, Virginia, Kansas, Texas, Arizona, Delaware, Indiana, Pennsylvania, Florida, Maryland, New Jersey, and Wisconsin.Palmer amaranth is highly
competitive
in row
crops
because of its wide germination window and aggressive growth under favorable weather conditions. In addition to being an obligate outcrossing species, Palmer amaranth has been shown to rapidly evolve resistance to numerous
herbicide
modes of action (ALS-inhibitors, EPSP synthase inhibitors, Photosystem II-inhibitors, HPPD-inhibitors and Microtubule-inhibitors). When left unmanaged, Palmer amaranth can cause significant yield losses.In Nebraska, HPPD-inhibitor resistance has already been confirmed in Palmer amaranth (CropWatch Jhala et al. October 4, 2013). This problem was associated primarily with seed corn production in south-central Nebraska. It is possible that this has become wider spread since the initial report. Applicators and growers should use these products judiciously if they suspect resistance.Figure 2. Estimate dose required to get 90% injury of the 40 most tolerant arbitrarily sampled Palmer amaranth populations of the 82 collected in south-western Nebraska. The solid horizontal black bar indicated the standard field use rate of 0.75 lb ae/acre.In greenhouse studies conducted last winter, we were able to screen 82 Palmer amaranth populations from southwest Nebraska to evaluate glyphosate resistance. Dose response analysis was performed to estimate the I90 (effective dose required to cause 90% injury to the population) values for each Palmer amaranth population. The populations, when screened in the greenhouse, showed low levels of resistance in many of the populations that were arbitrarily collected, and a few populations showed high levels of resistance (Figure 1). While the level of resistance may not directly translate to the field, the trends in the greenhouse provide a clear message that glyphosate alone is neither a long-term solution for management of this species nor a recommended practice.Continuing to rely on glyphosate alone for weed management will speed up the evolution of glyphosate-resistant weeds and diminish the effectiveness of glyphosate-based crops and weed control programs. Control of glyphosate-resistant Palmer amaranth will require an integrated approach including:practices of zero-tolerance (or mitigating seedbanks from being replenished at the end of the year),use of soil residual herbicides with different modes-of-action followed by labeled post-emergence herbicides other than glyphosate as needed throughout the growing season.Growers also should consider crop rotation when possible to help diversify the weed management tools being used to combat Palmer amaranth.Greg Kruger, Cropping Systems SpecialistBruno Canella Vieira and Spencer Samuelson, Graduates StudentsAmit Jhala, Extension Weeds SpecialistAll in the UNL Department of Agronomy and HorticultureMore news from:. CropWatch. University of NebraskaWebsite: http://www.cnchemicals.com/: May 3, 2015The news item on this page is copyright by the organization where it originatedFair use notice
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