Glyphosate and acetolactate synthase inhibitor resistant common ragweed (<i>Ambrosia artemisiifolia</i> L.) in southwestern Ontario

WelyAnnemarie, C Van; SoltaniNadar,; RobinsonDarren, E; HookerDavid, C; LawtonMark, B; SikkemaPeter, H

doi:10.4141/cjps-2014-290

Cited by 12 publications

(12 citation statements)

References 6 publications

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“…Finally, seed was collected in areas of previously known waterhemp populations in southwestern Ontario (Costea et al 2005;Vyn et al 2007). The survey methodology used was similar to previous published research for other herbicide-resistant weeds in Ontario (Falk et al 2005;Vink et al 2012;Byker et al 2013;Follings et al 2013;Van Wely et al 2015).…”

Section: Seed Collectionmentioning

confidence: 99%

Glyphosate- and multiple-resistant waterhemp (Amaranthus tuberculatus var. rudis) in Ontario, Canada

et al. 2017

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Waterhemp is one of the most troublesome weeds in the US and is spreading into Ontario. In 2014, a waterhemp population was not controlled with glyphosate in a field in Lambton County, ON. This population was the first confirmed glyphosate-resistant (GR) waterhemp in Canada. In 2015, waterhemp seeds were collected from 48 fields in Lambton (32), Chatham-Kent (2), and Essex (14) counties to determine the occurrence and distribution of GR waterhemp in Ontario. Waterhemp plants were grown in a greenhouse and sprayed when 10 cm in height. In addition to glyphosate (a group 9 herbicide), collected populations were screened for resistance to imazethapyr and atrazine, representing herbicide groups 2 and 5, respectively. Visual control estimates for biomass reduction were completed at 1, 3, and 5 wk after application. Glyphosate-resistant waterhemp was confirmed in 40 fields, representing 82% of all sampled fields from the three Ontario counties. Of the 49 populations collected, all were resistant to imazethapyr (group 2) and 76% were resistant to atrazine (group 5). Of all the populations tested, 61% of all samples were found to be resistant to all three herbicide groups. This study is the first to confirm GR waterhemp in Ontario.

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Section: Seed Collectionmentioning

confidence: 99%

Glyphosate- and multiple-resistant waterhemp (Amaranthus tuberculatus var. rudis) in Ontario, Canada

et al. 2017

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“…As of 2016, glyphosate-resistant (GR) Canada fleabane, giant ragweed, waterhemp, and common ragweed have been confirmed in 30, 6, 3, and 1 counties in Ontario, respectively (Follings et al 2013;Van Wely et al 2015;Budd et al 2017;Schryver et al 2017). With the recent evolution of GR weeds, there has been an increased interest in the use of 2,4-dichlorophenoxyacetic acid (2,4-D) applied late postemergence for the control of GR weeds such as Canada fleabane.…”

Section: Introductionmentioning

confidence: 99%

Tank mixture of glyphosate with 2,4-D accentuates 2,4-D injury in glyphosate-resistant corn

2018

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Six field trials were conducted at Ridgetown, ON, over a 2-yr period (2015 and 2016) to determine the tolerance of two corn hybrids to 2,4-D (560 and 1120 g a.i. ha−1) and glyphosate (1800 g a.e. ha−1) applied alone or in combination at stage V1, V3, or V5. In DeKalb DKC52-61 corn, 2,4-D caused as much as 24%, 16%, 11%, and 11% visible injury at 1 wk after each postemergence herbicide application (WAT), 2 WAT, 4 wk after the last postemergence herbicide application (WA-C), and 8 WA-C, respectively. Plant stand was not affected, but plant height decreased by 5 cm at 560 g a.i. ha−1 and 7% at 1120 g a.i. ha−1. As the application timing was delayed from stage V1 to V5, there was a trend to increased injury at both 2,4-D rates. Corn yield decreased 8% with 2,4-D applied at 560 g a.i. ha−1 and 12% at 1120 g a.i. ha−1. In Pioneer P0094AM corn, 2,4-D caused as much as 16%, 9%, 7%, and 7% visible injury at 1 WAT, 2 WAT, 4 WA-C, and 8 WA-C, respectively. Plant height was not affected, but goosenecking and brace root malformation were increased as the rate of 2,4-D was increased. There was generally no difference between glyphosate rates (1800 vs 0 g a.e. ha−1) at the V1 corn stage but visible injury, goosenecking, and brace root malformation at other application timings was as much as 15%, 3%, and 19% greater when 2,4-D was applied in a tank mixture with glyphosate, respectively. Yield was reduced by 12% when 2,4-D (1120 g a.i. ha−1) was applied with glyphosate in the tank mixture.

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“…Previously, this field had a soybean-soybean-winter wheat rotation. This population is resistant to ALS (acetolactate synthase) inhibitors and EPSPS (5-enolpyruvyl shikimate-3-phosphate synthase) inhibitors herbicides (Van Wely et al 2014a). Van Wely et al (2014b) reported up to a 28-fold increase in the amount of glyphosate required for a 50% reduction in weed biomass for the biotype at this location compared to the susceptible biotype.…”

Section: Methodsmentioning

confidence: 97%

Single and sequential applications of dicamba for the control of glyphosate-resistant common ragweed in glyphosate- and dicamba-resistant soybean

et al. 2018

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Confirmation of glyphosate-resistant (GR) weeds in southwestern Ontario has led to a change in weed management practices, particularly in soybean. Registered soil-applied herbicides have been identified that have activity on GR common ragweed; however, due to the long emergence period of common ragweed, additional postemergence options are required. The recent development of glyphosate- and dicamba-resistant soybean (Roundup Ready Xtend soybean) allows for the preplant and postemergence application of dicamba. Three field studies were conducted in Ontario, Canada, in a field with confirmed GR common ragweed. Glyphosate-resistant common ragweed interference resulted in 75% yield loss in soybean compared with the weed-free check. At 4 wk after application, dicamba tank-mixed with glyphosate applied preplant only, postemergence only, or preplant followed by postemergence controlled GR common ragweed up to 94%, 87%, and 99%, respectively. The availability of dicamba for use in glyphosate- and dicamba-resistant soybean will provide an additional mode of action for weed management in soybean.

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Glyphosate and acetolactate synthase inhibitor resistant common ragweed (Ambrosia artemisiifolia L.) in southwestern Ontario

Cited by 12 publications

References 6 publications

Glyphosate- and multiple-resistant waterhemp (Amaranthus tuberculatus var. rudis) in Ontario, Canada

Glyphosate- and multiple-resistant waterhemp (Amaranthus tuberculatus var. rudis) in Ontario, Canada

Tank mixture of glyphosate with 2,4-D accentuates 2,4-D injury in glyphosate-resistant corn

Single and sequential applications of dicamba for the control of glyphosate-resistant common ragweed in glyphosate- and dicamba-resistant soybean

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