The influence of multiple herbicide resistance on growth and development of Amaranthus tuberculatus and the efficacy of the very long chain fatty acid-inhibiting herbicides on multiple herbicide-resistant Amaranthus tuberculatus; Investigating a putative 4-hydroxylphenylpyruvate dioxygenase-inhibiti

dc.contributor.advisor Micheal D. Owen
dc.contributor.advisor Robert G. Hartzler
dc.contributor.author Jones, Eric
dc.contributor.department Agronomy
dc.date 2018-08-11T18:47:33.000
dc.date.accessioned 2020-06-30T03:10:44Z
dc.date.available 2020-06-30T03:10:44Z
dc.date.copyright Tue May 01 00:00:00 UTC 2018
dc.date.embargo 2001-01-01
dc.date.issued 2018-01-01
dc.description.abstract <p>Iowa farmers rely mainly on herbicides for weed management. Inconsistent and unsatisfactory weed control is being realized as the spread of herbicide-resistant weed populations has increased. Populations of waterhemp (Amaranthus tuberculatus (Moq.) J.D. Sauer) and giant ragweed (Ambrosia trifida L.) have evolved resistance to glyphosate and other herbicides commonly used in crop fields. This research focuses on the growth and development of multiple herbicide-resistant waterhemp and assessing the evolution of new herbicide-resistant waterhemp and giant ragweed populations.</p> <p>Significant differences in growth, flowering, accumulated biomass, and seed production were detected when the multiple herbicide-resistant waterhemp populations were compared to a herbicide-susceptible waterhemp population. While statistically significant differences were detected, the small differences are not likely to select herbicide-susceptible waterhemp populations over MHR waterhemp populations. Thus, it can be concluded that plants with multiple herbicide resistances are not likely incurring a fitness penalty and may remain in the agroecosystem.</p> <p>Currently, very long chain fatty acid- and 4-hydroxyphenylpyruvate dioxygenase (HPPD, EC 1.13.11.27)-inhibiting herbicides are still efficacious on many waterhemp and giant ragweed populations, respectively. Since herbicides impart such a large selection pressure on weed populations, the recurrent use of specific herbicides may decrease efficacy longevity as only herbicide-resistant individuals will remain.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/16386/
dc.identifier.articleid 7393
dc.identifier.contextkey 12318736
dc.identifier.doi https://doi.org/10.31274/etd-180810-6016
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/16386
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/30569
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/16386/Jones_iastate_0097M_17345.pdf|||Fri Jan 14 20:59:20 UTC 2022
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.title The influence of multiple herbicide resistance on growth and development of Amaranthus tuberculatus and the efficacy of the very long chain fatty acid-inhibiting herbicides on multiple herbicide-resistant Amaranthus tuberculatus; Investigating a putative 4-hydroxylphenylpyruvate dioxygenase-inhibiti
dc.type article
dc.type.genre thesis
dspace.entity.type Publication
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
thesis.degree.discipline Agronomy
thesis.degree.level thesis
thesis.degree.name Master of Science
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