Results 131 to 140 of about 328 (162)
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Competitiveness of Herbicide-Resistant Waterhemp (Amaranthus tuberculatus) with Soybean
Weed Science, 2018AbstractWaterhemp [Amaranthus tuberculatus(Moq.) J. D. Sauer] is a troublesome weed occurring in cropping systems throughout the U.S. Midwest with an ability to rapidly evolve herbicide resistance that could be associated with competitive disadvantages. Little research has investigated the competitiveness of differentA.
Thomas R. Butts +4 more
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Pollen Biology and Dispersal Dynamics in Waterhemp (Amaranthustuberculatus)
Weed Science, 2012Waterhemp is a major weed of field crops in the Midwestern United States. Its prevalence is at least partly due to its rapid evolution of resistance to many groups of herbicides over the last two decades. In light of its dioecy and anemophily, pollen movement in waterhemp is considered to be an important factor in the spread of herbicide resistance ...
Jianyang Liu +2 more
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Weed Technology, 2013
A survey of soybean fields containing waterhemp infestations was conducted just prior to harvest in 2008 and 2009 to determine the frequency and distribution of glyphosate-resistant waterhemp in Missouri, and to determine if there are any in-field parameters that may serve as indicators of glyphosate resistance in this species in future crop production
Kristin K. Rosenbaum, Kevin W. Bradley
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A survey of soybean fields containing waterhemp infestations was conducted just prior to harvest in 2008 and 2009 to determine the frequency and distribution of glyphosate-resistant waterhemp in Missouri, and to determine if there are any in-field parameters that may serve as indicators of glyphosate resistance in this species in future crop production
Kristin K. Rosenbaum, Kevin W. Bradley
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Common waterhemp (Amaranthus rudis) resistance to protoporphyrinogen oxidase-inhibiting herbicides
Weed Science, 2003Abstract Resistance to protoporphyrinogen oxidase (protox)-inhibiting herbicides was identified in a population of common waterhemp that had been treated with acifluorfen for several years. The protox-resistant biotype of common waterhemp was approximately 34, 82, 8, and 4 times more resistant than a susceptible common waterhemp biotype to acifluorfen,
Douglas E. Shoup +2 more
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A Waterhemp (Amaranthus tuberculatus) Population Resistant to 2,4-D
Weed Science, 2012A waterhemp population from a native-grass seed production field in Nebraska was no longer effectively controlled by 2,4-D. Seed was collected from the site, and dose-response studies were conducted to determine if this population was herbicide resistant.
Mark L. Bernards +4 more
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Glyphosate-Resistant Common Waterhemp (Amaranthus rudis) Confirmed in Texas
Weed Technology, 2011Glyphosate-resistantAmaranthusspecies are a recognized risk to U.S. agriculture. With affected cropland exceeding 1.2 million ha, this epidemic is particularly pertinent to agricultural regions that utilize an intensive glyphosate-based management program to control weedy pests. Before 2006, Texas had no identified glyphosate-resistant populations. Two
G. G. Light +4 more
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Weed Science, 2004
Abstract Common waterhemp seeds were collected from two Missouri soybean fields where biotypes were not controlled by acifluorfen. Plants grown from these seeds were tested for resistance to the diphenyl ether herbicides acifluorfen and lactofen. Resistance to susceptibility (R/S) ratios, calculated as the ratio of the dose required to inhibit dry ...
Jianmei Li +3 more
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Abstract Common waterhemp seeds were collected from two Missouri soybean fields where biotypes were not controlled by acifluorfen. Plants grown from these seeds were tested for resistance to the diphenyl ether herbicides acifluorfen and lactofen. Resistance to susceptibility (R/S) ratios, calculated as the ratio of the dose required to inhibit dry ...
Jianmei Li +3 more
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Sampling the Waterhemp (Amaranthus tuberculatus) Genome Using Pyrosequencing Technology
Weed Science, 2009Recent advances in sequencing technologies (next-generation sequencing) offer dramatically increased sequencing throughput at a lower cost than traditional Sanger sequencing. This technology is changing genomics research by allowing large scale sequencing experiments in nonmodel systems.
Ryan M. Lee +8 more
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Acetolactate Synthase Resistance in a Common Waterhemp (Amaranthus rudis) Population
Weed Technology, 1997Research was initiated to determine (a) whether a common waterhemp population was resistant to acetolactate synthase (ALS) inhibiting herbicides, (b) the percentage of the population that was ALS-inhibitor resistant, (c) the resistance mechanism, and (d) the effectiveness of a whole plant assay to detect ALS-inhibitor resistance.
John R. R. Hinz, Micheal D. K. Owen
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