Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) Morphology, Growth, and Seed Production in Georgia

@inproceedings{Webster2015GlyphosateResistantPA,
  title={Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) Morphology, Growth, and Seed Production in Georgia},
  author={T. Webster and T. Grey},
  booktitle={Weed Science},
  year={2015}
}
Abstract Herbicide-resistant Palmer amaranth has become the most economically detrimental weed of cotton in the southeast United States. With the continual marginalization of potential herbicide tools, research has expanded to include alternative means of affecting future Palmer amaranth populations by altering safe sites and reducing inputs to the seedbank population. The influence of delayed Palmer amaranth establishment on seed production potential has not been investigated in the southeast… Expand
Susceptibility of Palmer Amaranth (Amaranthus palmeri) to Herbicides in Accessions Collected from the North Carolina Coastal Plain
TLDR
Data suggest A. palmeri resistant to chemistries other than glyphosate and thifensulfuron-methyl are present in NC, which highlights the need for weed management approaches to mitigate the evolution and spread of herbicide-resistant populations. Expand
Influence of timing of Palmer amaranth control in dicamba-resistant cotton on yield and economic return
TLDR
Glyphosate-resistant Palmer amaranth continues to be challenging to control across the U.S. cotton belt and was controlled at least 98% by herbicides applied at least three times regardless of timing of application or herbicide sequence. Expand
Tall Waterhemp (Amaranthus tuberculatus) and Palmer amaranth (Amaranthus palmeri) Seed Production and Retention at Soybean Maturity
TLDR
It is demonstrated that there is great opportunity for Palmer amaranth and tall waterhemp seed capture or destruction at soybean harvest, and there is continued need for research focused on developing and testing harvest weed seed control tactics that aim at reducing the soil seedbank and lowering risks for evolution of herbicide resistance. Expand
Effects of Palmer Amaranth (Amaranthus palmeri) Establishment Time and Distance from the Crop Row on Biological and Phenological Characteristics of the Weed: Implications on Soybean Yield
Abstract Information about weed biology and weed population dynamics is critical for the development of efficient weed management programs. A field experiment was conducted in Fayetteville, AR,Expand
Investigating glyphosate resistance in Amaranthus palmeri biotypes from Turkey
TLDR
Some increased tolerance of A. palmeri biotypes to glyphosate is demonstrated, which reinforces the need to implement integrated weed management to control this invasive plant in Turkey. Expand
Management of Large, Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) in Corn
TLDR
The herbicides alone or in combinations applied as tank mixtures did not improve control over dicamba plus diflufenzopyr alone, and there were no grain-yield differences among treatments because of Palmer amaranth control. Expand
Soybean Density and Palmer Amaranth (Amaranthus palmeri) Establishment Time: Effects on Weed Biology, Crop Yield, and Economic Returns
TLDR
Investigation of how various soybean densities and A. palmeri establishment timings in weeks after crop emergence affect height, biomass, and seed production of the weed but also crop yield in drill-seeded soybean revealed the benefits of moderate seeding rate on crop revenue, net income returns, and breakeven price. Expand
Control of Palmer amaranth (Amaranthus palmeri) and common waterhemp (Amaranthus rudis) in double crop soybean and with very long chain fatty acid inhibitor herbicides
TLDR
During 2015 and 2016, five site years of research were implemented in double crop soybean after winter wheat at experiment fields in Kansas to assess various non-glyphosate herbicide treatments at three different application timings for control of Palmer amaranth (Amaranthus palmeri S. Wats.) and common waterhemp. Expand
DETECTION OF GLYPHOSATE-RESISTANT PALMER AMARANTH (Amaranthus palmeri) IN AGRICULTURAL AREAS OF MATO GROSSO, BRAZIL
TLDR
Comparison of the Brazilian A.palmeri biotype to the A.hybridus biotypes, as well as to the results available in scientific international literature, led to the conclusion that the Brazilian Palmer amaranth biotype is resistant to glyphosate. Expand
Herbicide Options for Control of Palmer Amaranth (Amaranthus palmeri) and Common Waterhemp (Amaranthus rudis) in Double-Crop Soybean
TLDR
Assessment of non-glyphosate herbicide programs at three different application timings for the control of Palmer amaranth and waterhemp in double-crop soybean after winter wheat finds excellent control of both species was observed 2 WAP with a PRE paraquat application; however, reduced control was noted 8 WAP due to subsequent emergence. Expand
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References

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Glyphosate Resistance Does Not Affect Palmer Amaranth (Amaranthus palmeri) Seedbank Longevity
Abstract A greater understanding of the factors that regulate weed seed return to and persistence in the soil seedbank is needed for the management of difficult-to-control herbicide-resistant weeds.Expand
WEED SCIENCE Cotton Yield Loss Potential in Response to Length of Palmer Amaranth (Amaranthus palmeri) Interference
Field studies were conducted near Ideal, GA in 2006 and 2007 to determine the influence of simulated delayed emergence of Palmer amaranth at several densities on cotton yield and weed growth. PalmerExpand
WEED SCIENCE Critical Timing of Palmer Amaranth (Amaranthus palmeri) Removal in Second-Generation Glyphosate-Resistant Cotton
Field experiments were conducted in 2003, 2004, 2005, and 2006 to determine the critical timing of Palmer amaranth (Amaranthus palmeri S. Wats.) removal in second-generation glyphosate-resistantExpand
Interference of Palmer amaranth in corn
TLDR
Although Palmer amaranth is highly competitive in corn, this study shows that yield loss is affected more by time of emergence than by density. Expand
Palmer Amaranth (Amaranthus palmeri) in Tennessee Has Low Level Glyphosate Resistance
TLDR
Results suggest that an altered target site is not responsible for glyphosate resistance in these Palmer amaranth biotypes, although the level of resistance was higher based on plant mortality response (about 10×). Expand
Glyphosate-resistant Palmer amaranth (Amaranthus palmeri ) confirmed in Georgia
TLDR
A glyphosate-resistant Palmer amaranth biotype was confirmed in central Georgia and I50 values for visual control and shoot fresh weight were 8 and 6.2 times greater, respectively, with the resistant biotype compared with a known glyphosate-susceptible biotype. Expand
Comparative growth of six Amaranthus species in Missouri
TLDR
Because the timing for many postemergence herbicides depends on weed height, rapid growth shortly after emergence reduces the time frame for optimum control of species such as Palmer amaranth. Expand
Severed stems of Amaranthus palmeri are capable of regrowth and seed production in Gossypium hirsutum
TLDR
Results demonstrate that severely pruned A. palmeri plants can resume growth, reach reproductive maturity and produce viable seed, which have the potential to repopulate soil seedbanks. Expand
Confirmation and Control of Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) in Arkansas
TLDR
The glyphosate-resistant biotype was effectively controlled with most of the evaluated herbicides, but the use of acetolactate synthase-inhibiting herbicides such as pyrithiobac, trifloxysulfuron, and imazethapyr is not a viable option for control of this Palmer amaranth population. Expand
Interference of redroot pigweed (Amaranthus retroflexus), Palmer amaranth (A. palmeri), and common waterhemp (A. rudis) in soybean
TLDR
The effect of weed density on soybean yield loss, pigweed biomass, and pigweed seed production were described using a rectangular hyperbola model and the relative ranking of the pigweed species biomass was Palmer amaranth > common waterhemp > redroot pigweed. Expand
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