Control of Canada fleabane (&amp;lt;i&amp;gt;Conyza canadensis&amp;lt;/i&amp;gt;) with glyphosate DMA/2,4-D choline applications in corn (&amp;lt;i&amp;gt;Zea mays&amp;lt;/i&amp;gt;)

Ford, Laura; Soltani, Nader; McFadden, Allan; Nurse, Robert E.; Robinson, Darren E.; Sikkema, Peter H.

doi:10.4236/as.2014.51009

Cited by 8 publications

(8 citation statements)

References 23 publications

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“…grain yield by 83% to 93%. Similarly, Ford et al (2014) reported a 92% reduction in corn (Zea mays L.) grain yield at a horseweed density of 60 plants m −2 . Horseweed competition in cotton (Gossypium hirsutum L.) reduced lint yield up to 2.9-fold (Owen et al 2011;Steckel and Gwathmey 2009).…”

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confidence: 92%

Confirmation of Glyphosate-Resistant Horseweed (Conyza canadensis) in Montana Cereal Production and Response to POST Herbicides

2017

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In recent years, horseweed has become an increasing problem in Montana. To confirm and characterize the level of glyphosate resistance, seeds were collected from putative glyphosate-resistant (GR) horseweed (GR-MT) plants in a wheat–fallow field in McCone County, MT. Known GR (GR-NE) and glyphosate-susceptible (GS-NE) horseweed accessions from Lincoln, NE, were included for comparison in dose–response and shikimate accumulation studies. Whole-plant glyphosate dose–response experiments conducted at the early- (5- to 8-cm diameter) and late- (12- to 15-cm diameter) rosette stages of horseweed indicated that GR-MT accessions had a 2.5- to 4.0-fold level of resistance to glyphosate relative to the GS-NE accession, on the basis of shoot dry weight (GR50values). The level of resistance was 3.1- to 7.9-fold on the basis of visually assessed injury estimates (I50values). At the whole-plant level, about 2.1- to 4.5-fold higher shikimate accumulation was observed in the GS-NE accession compared with the GR-MT and GR-NE accessions over a 10-d period after glyphosate was applied at 1,260 g ae ha−1. In a separate greenhouse study, all three horseweed accessions were also screened with alternate POST herbicides registered for use in wheat–fallow rotations. The majority of the tested herbicides provided ≥90% injury at the field-use rates for all three horseweed accessions 3 wk after treatment. This is the first published report on the occurrence of GR horseweed in Montana cereal production. Increased awareness and adoption of best management practices, including the use of diversified (based on multiple sites of action) herbicide programs highlighted in this study, would aid in mitigating the further spread of GR horseweed in the cereal production fields of the U.S. Great Plains.

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confidence: 92%

Confirmation of Glyphosate-Resistant Horseweed (Conyza canadensis) in Montana Cereal Production and Response to POST Herbicides

2017

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“…No differences in model slope or upper limit (100%) occurred between hybrids within growth stages. In glyphosate‐resistant field corn, 2,4‐D choline/glyphosate applied at 1,720 g ae ha ‒1 resulted in 0–63% injury at 7 DAT, with the predominate injury symptoms being fused brace roots, and 63% injury resulting from a location where the corn was at the V4 growth stage at the time of application (Ford et al., 2014). The highest rate of 2,4‐D choline/glyphosate applied in this study was 550 g ae ha ‒1 (0.25×) which primarily resulted in glyphosate injury symptoms in both popcorn hybrids.…”

Section: Resultsmentioning

confidence: 99%

Dose response of yellow and white popcorn hybrids to glyphosate, a premix of 2,4‐D choline and glyphosate, or dicamba

et al. 2020

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Popcorn (Zea mays L. var. everta) is difficult to distinguish from field corn (Zea mays L. var. indentata) and is produced adjacent or in close proximity to field corn and soybean [Glycine max (L.) Merr.]. This creates a potential for misapplication or drift of herbicides used in nearby corn and soybean. Field experiments were conducted near Clay Center, Nebraska in 2017 and 2018 to determine the effect of glyphosate, 2,4‐D choline/glyphosate (premix), or dicamba on the growth and yield of popcorn. Treatments included nontreated control and four rates of glyphosate, 2,4‐D choline/glyphosate, or dicamba applied post‐emergence (POST) at five‐ or eight‐leaf (V5 and V8, respectively) popcorn growth stages to white and yellow popcorn hybrids. A three‐parameter log‐logistic model was fitted to treatment combination with varying herbicide rates. Glyphosate and 2,4‐D choline/glyphosate applied at V5 had greater injury, biomass reduction, height reduction, and yield loss than at V8. The two hybrids responded similarly to herbicides at most measurements. At the V8 application, 2,4‐D choline/glyphosate resulted in greater injury in the white hybrid; however, no hybrid differences in glyphosate sensitivity were observed at the V8 growth stage. Glyphosate and 2,4‐D choline/glyphosate at 0.25× rates resulted in complete plant death in both hybrids, whereas the highest dicamba dose (2×) caused 11% injury and no biomass reduction, plant height reduction, or yield loss. These results demonstrate the sensitivity of popcorn to glyphosate, 2,4‐D choline/glyphosate, or dicamba and can be of immediate educational use and practical implementation for popcorn producers, herbicide applicators, and agronomists.

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“…Horseweed, also known as marestail, Canada fleabane, and Canadian horseweed, is a forb commonly found in meadows, farmland, orchards (Ford et al 2014;Shrestha et al 2008), and agronomic crops (Bhowmik and Bekech 1993;Chahal and Jhala 2019). The plant has one to several erect stems and can reach a height of 1 to 2 m (Huang et al 2015;Regehr and Bazzaz 1979).…”

Section: Horseweedmentioning

confidence: 99%

“…The plant has one to several erect stems and can reach a height of 1 to 2 m (Huang et al 2015;Regehr and Bazzaz 1979). Horseweed inflorescences, also known as capitula (a capitulum is a collection of 16 to 22 individual flowers, both ray and disc flowers), are numerous and have very small heads, 2 to 4 mm tall and 2 to 4 mm wide (Ford et al 2014). In addition to competing with agronomic crops for resources and reducing yields, horseweed is a problematic weed in no-till crop production systems because of the small, wind-dispersed seeds that cannot germinate from soil depths much greater than approximately 3 mm and evolution of resistance to several herbicide chemistries (Davis and Johnson 2008;Huang et al 2015;VanGessel 2001;Weaver 2001).…”

Section: Horseweedmentioning

confidence: 99%

Pollen-mediated gene flow and transfer of resistance alleles from herbicide-resistant broadleaf weeds

et al. 2020

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Pollen-mediated gene flow (PMGF) refers to the transfer of genetic information (alleles) from one plant to another compatible plant. With the evolution of herbicide-resistant (HR) weeds, PMGF plays an important role in the transfer of resistance alleles from HR to susceptible weeds; however, little attention is given to this topic. The objective of this paper was to review reproductive biology, PMGF studies, and interspecific hybridization as well as potential for herbicide resistance alleles to transfer in the economically important broadleaf weeds including common lambsquarters, giant ragweed, horseweed, kochia, Palmer amaranth, and waterhemp. The PMGF studies involving these species reveal that transfer of herbicide resistance alleles routinely occurs under field conditions and is influenced by several factors such as reproductive biology, environment, and production practices. Interspecific hybridization studies within Amaranthus and Ambrosia spp. show that herbicide resistance allele transfer is possible between species of the same genus, but at relatively low levels. The widespread occurrence of HR weed populations and high genetic diversity is at least partly due to PMGF, particularly in dioecious species such as Palmer amaranth and waterhemp compared with monoecious species such as common lambsquarters and horseweed. Prolific pollen production in giant ragweed contributes to PMGF. Kochia, a wind pollinated species can efficiently disseminate herbicide resistance alleles via both PMGF and tumbleweed seed dispersal, resulting in widespread occurrence of multiple HR kochia populations. The review conducted for the aforementioned species verifies that intraspecific and interspecific gene flow can occur, and even at a low rate, could contribute to the rapid spread of herbicide resistance alleles. Further research is needed to determine the role of PMGF in transferring multiple herbicide resistance alleles at the landscape level.

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Control of Canada fleabane (<i>Conyza canadensis</i>) with glyphosate DMA/2,4-D choline applications in corn (<i>Zea mays</i>)

Cited by 8 publications

References 23 publications

Confirmation of Glyphosate-Resistant Horseweed (Conyza canadensis) in Montana Cereal Production and Response to POST Herbicides

Confirmation of Glyphosate-Resistant Horseweed (Conyza canadensis) in Montana Cereal Production and Response to POST Herbicides

Dose response of yellow and white popcorn hybrids to glyphosate, a premix of 2,4‐D choline and glyphosate, or dicamba

Pollen-mediated gene flow and transfer of resistance alleles from herbicide-resistant broadleaf weeds

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