Giant Ragweed (<i>Ambrosia trifida</i>) Canopy Architecture and Interference Studies in Soybean (<i>Glycine max</i>)

Webster, Theodore M.; Loux, Mark M.; Regnier, Emilie E.; Harrison, S. Kent

doi:10.1017/s0890037x00039683

Cited by 75 publications

(93 citation statements)

References 15 publications

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“…If the cost of hand weeding giant ragweed is similar to that for hand weeding palmer amaranth, planting wheat or alfalfa would become much more economical than found in this study since hand weeding was not required for these crops. If giant ragweed is allowed to compete with corn and soybean, corn yield can be reduced by up to 90% with 1.4 giant ragweed plants m -2 (Harrison et al, 2001) and soybean yield can be reduced by 45 to 77% with 1.0 giant ragweed plant m -2 (Webster et al, 1994). …”

Section: Herbicide-resistant Giant Ragweed Implicationsmentioning

confidence: 99%

“…Giant ragweed is one of the most competitive and problematic weeds aff ecting crop production in the midwestern United States and has recently developed resistance to multiple herbicide sites of action, including acetolactate synthase and 5-enolpyruvylshikimate-3-phosphate synthase inhibitors (Webster et al, 1994;Heap, 2016). Crop rotations with multiple years of alfalfa reduce herbicide-resistant giant ragweed emergence while maintaining a similar level of seed bank depletion as other crop rotations common to the midwestern United States (Goplen et al, 2017).…”

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confidence: 99%

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Economic Performance of Crop Rotations in the Presence of Herbicide‐Resistant Giant Ragweed

et al. 2018

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Economic assessment of alternative crops and crop rotations helps farmers determine those most appropriate for their farms. Th e objective of this research was to evaluate the economic net return and associated fi nancial risk for crops and crop rotations common to the midwestern United States, based on two 3-yr experiments in southern Minnesota where herbicide-resistant giant ragweed (Ambrosia trifi da L.) was present. Crop rotations included corn (Zea mays L.), soybean [Glycine max L. (Merr.)], wheat (Triticum aestivum L.), and alfalfa (Medicago sativa L.). Crop rotations were continuous corn (CCC), soybean-corncorn (SCC), corn-soybean-corn (CSC), soybean-wheat-corn (SWC), soybean-alfalfa-corn (SAC), and alfalfa-alfalfa-corn (AAC). Average crop yields during the study period were utilized along with average prices received and estimated production costs for each crop in Minnesota during this period to evaluate economic net return. Average net return of the SWC, SCC, CCC, CSC, SAC, and AAC rotations was US$11, $170, $247, $258, $368, and $919 ha -1 yr -1 , respectively. Th e AAC rotation was stochastically dominant to all other crop rotations for risk-averse decision makers. One or 2 yr of alfalfa stochastically dominated corn, soybean, and wheat, regardless of crop rotation, largely due to more stable alfalfa prices over the study period coupled with above-average yield and lower production costs. Th ese results confi rm that rotations containing alfalfa have the potential to provide a substantial economic net return to farmers while mitigating the risk of herbicide-resistant giant ragweed (Ambrosia trifi da L.) infestations.

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Section: Herbicide-resistant Giant Ragweed Implicationsmentioning

confidence: 99%

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confidence: 99%

Economic Performance of Crop Rotations in the Presence of Herbicide‐Resistant Giant Ragweed

et al. 2018

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“…Additionally, most of the GR weeds in the midwest are also resistant to ALS-inhibitors such as chlorimuron-ethyl, imazamox, imazaquin, imazethapyr, thifensulfuron-methyl (Legleiter & Bradley, 2008;Sarangi et al, 2015). example, in Missouri and Ohio, one giant ragweed plant per m -2 reduced soybean yield more than 45% (Baysinger & Sims, 1991;Webster et al, 1994). Similarly, Hager et al (2002) reported up to 43% reduction in soybean yield when common waterhemp interference was allowed to persist 4 wk or longer after soybean unifoliate leaf expansion.…”

Section: Introductionmentioning

confidence: 96%

Glyphosate-Resistant Weed Control and Soybean Injury in Response to Different PPO-Inhibiting Herbicides

Aulakh¹,

Chahal²,

Jhala³

2016

JAS

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In Nebraska, 5-enolpyruvyl shikimate-3-phosphate synthase (EPSPS) as well as acetolactate synthase (ALS)-inhibitor-resistant weeds occur in many soybean fields where herbicides from these modes-of-action have been frequently used in the past. Currently, the protoporphyrinogen oxidase (PPO)-inhibitors are the only effective herbicides for POST control of both glyphosate-and ALS-inhibitor-resistant weeds in soybean. Greenhouse experiments were conducted in 2014 to evaluate the efficacy of PPO-inhibitors applied POST for the control of three glyphosate-resistant (GR) weeds and potential for soybean injury, when applied at two growth stages. All herbicide treatments controlled 10-and 20-cm tall GR common waterhemp ≥ 95% at 21 DAT. GR giant ragweed and kochia were controlled 86 to 99% when treated at 10-cm height and 78 to 92% at 20-cm height by 21 DAT. Herbicide treatments reduced shoot biomass in the three GR weeds 88 to 100% when treated at 10-cm height and 73 to 100% when treated at 20-cm height, at 21 DAT. Soybean injury and shoot biomass data revealed that acifluorfen and lactofen were more injurious (≥ 17%), whereas fomesafen, and fomesafen plus glyphosate were relatively safer (< 10% injury). Overall, fomesafen and fomesafen plus glyphosate caused least injury to soybean and were more effective in controlling GR common waterhemp, giant ragweed, and kochia compared with acifluorfen and lactofen.

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“…Giant ragweed has caused corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] grain yield losses ≥50% at a weed population density of 1 plant m -2 [4][5][6]. A 30% reduction in yield in soybean was observed in the presence of a common ragweed density of 1 plant per 1.5 m 2 [7].…”

Section: Introductionmentioning

confidence: 99%

Germination ecology of Ambrosia artemisiifolia L. and Ambrosia trifida L. biotypes suspected of glyphosate resistance

et al. 2013

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The germination ecology of Ambrosia artemisiifolia and A. trifida glyphosate susceptible biotypes sampled in marginal areas, was compared with that of the same species but different biotypes suspected of glyphosate resistance, common and giant ragweed, respectively. The suspected resistant biotypes were sampled in Roundup Ready® soybean fields. Within each weed species, the seeds of the biotype sampled in marginal area were significantly bigger and heavier than those of the biotype sampled in the soybean fields. A. artemisiifolia biotypes exhibited a similar dormancy and germination, while differences between A. trifida biotypes were observed. A. artemisiifolia biotypes showed similar threshold temperature for germination, whereas, the threshold temperature of the susceptible A. trifida biotype was half as compared to that of the resistant A. trifida biotype. No significant differences in emergence as a function of sowing depth were observed between susceptible A. artemisiifolia and suspected resistant A. trifida biotype, while at a six-cm seedling depth the emergence of the A. artemisiifolia susceptible biotype was 2.5 times higher than that of the A. trifida suspected resistant biotype. This study identified important differences in seed germination between herbicide resistant and susceptible biotypes and relates this information to the ecology of species adapted to Roundup Ready® fields. Information obtained in this study supports sustainable management strategies, with continued use of glyphosate as a possibility.

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Giant Ragweed (Ambrosia trifida) Canopy Architecture and Interference Studies in Soybean (Glycine max)

Cited by 75 publications

References 15 publications

Economic Performance of Crop Rotations in the Presence of Herbicide‐Resistant Giant Ragweed

Economic Performance of Crop Rotations in the Presence of Herbicide‐Resistant Giant Ragweed

Glyphosate-Resistant Weed Control and Soybean Injury in Response to Different PPO-Inhibiting Herbicides

Germination ecology of Ambrosia artemisiifolia L. and Ambrosia trifida L. biotypes suspected of glyphosate resistance

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