Herbicide options for glyphosate-resistant kochia (Bassia scoparia) management in the Great Plains

Sbatella, Gustavo M.; Adjesiwor, Albert T.; Kniss, Andrew R.; Stahlman, Phillip W.; Westra, Phil; Moechnig, Mike; Wilson, R. G.

doi:10.1017/wet.2019.48

Cited by 7 publications

(7 citation statements)

References 31 publications

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“…Previous research has indicated that the combination of herbicide rotation and tank‐mixtures can delay the evolution of new HR weed biotypes (Beckie et al., 2019; Busi et al., 2019; Gage et al., 2019), and these are endorsed as best management practices in both nonintegrated and integrated weed management programs (Knezevic & Cassman, 2003; Norsworthy et al., 2012). Research on HR weed populations has also shown that tank‐mixtures with multiple effective SOAs can control GR weed biotypes, such as common ragweed (Barnes, Knezevic, Sikkema, Lindquist, & Jhala, 2017; Byker et al., 2018), waterhemp (Jhala, Sandell, Sarangi, Kruger, & Knezevic, 2017), horseweed (Chahal & Jhala, 2019), and kochia (Sbatella et al., 2019). Similarly, tank‐mixtures with multiple effective SOAs have been shown to control other HR weed biotypes, such as PPO‐inhibitor resistant Palmer amaranth (Schwartz‐Lazaro, Norsworthy, Scott, & Barber, 2017) or atrazine/hydroxyphenyl‐pyruvate‐dioxygenase inhibitor‒resistant Palmer amaranth (Chahal & Jhala, 2019).…”

Section: Introductionmentioning

confidence: 99%

Economics of herbicide programs for weed control in conventional, glufosinate, and dicamba/glyphosate‐resistant soybean across Nebraska

et al. 2020

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Despite widespread adoption of dicamba/glyphosate-resistant (DGR) soybean [Glycine max (L.) Merr.] in Nebraska and across the United States in recent years, economic information comparing herbicide programs with glufosinate-resistant (GLU-R) and conventional soybean is not available. The objectives of this study were to evaluate weed control efficacy, crop safety, gross profit margin, and benefit/cost ratios of herbicide programs with multiple sites of action in DGR, GLU-R, and conventional soybean. Field experiments were conducted in 2018 and 2019 at three irrigated and two rain-fed locations across Nebraska, for a total of 10 site-years. Herbicides applied pre-emergence (PRE) that included herbicides with three sites of action provided 85-99% control of common lambsquarters (Chenopodium album L.), Palmer amaranth (Amaranthus palmeri S. Watson), velvetleaf (Abutilon theophrasti Medik.), and a mixture of foxtail (Seteria spp.) and Poaceae species. Pre-emergence herbicides evaluated in this study provided 72-96% weed biomass reduction and 61-79% weed density reductions compared with the nontreated control. Herbicides applied post-emergence (POST; dicamba plus glyphosate, glyphosate, glufosinate, and acetochlor plus clethodim plus lactofen) provided 93-99% control of all weed species 28 d after POST (DAPOST). Herbicides applied POST provided 89-98% weed biomass reduction and 86-96% density reduction at 28 DAPOST. For individual site-years, yield was often similar for PRE followed by POST herbicide programs in herbicide-resistant (HR) and conventional soybean. Gross profit margins and benefit/cost ratios were higher in HR soybean than in conventional soybean, although price premiums for conventional soybean can help compensate for increased herbicide costs.

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Section: Introductionmentioning

confidence: 99%

Economics of herbicide programs for weed control in conventional, glufosinate, and dicamba/glyphosate‐resistant soybean across Nebraska

et al. 2020

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“…Based on representative herbicide programs in the United States, GR kochia control varied among experimental sites to a greater extent in wheat compared with corn (Zea mays L.) or soybean [Glycine max (L.) Merr.] (Sbatella et al 2019). Lower densities of glyphosate-susceptible (GS) kochia (14 and 21 plants m -2 ) reduced spring wheat yield by 10 to 33% in Manitoba, while higher densities (195 to 520 plants m -2 ) reduced yield by 40 to 73% (Friesen et al 2009).…”

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confidence: 99%

Herbicide strategies for managing glyphosate-resistant and -susceptible kochia (Bassia scoparia) in spring wheat

Torbiak¹,

Blackshaw

Brandt

et al. 2021

Can. J. Plant Sci.

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Kochia [Bassia scoparia (L.) A.J. Scott] is a summer-annual tumbleweed that is tolerant of heat, drought and salinity, and capable of causing large yield losses in spring wheat (Triticum aestivum L). Increased incidence of glyphosate and acetolactate synthase (ALS) inhibitor-resistant kochia in Western Canada warrants investigation of alternative herbicides to manage these biotypes. Herbicides applied pre- or post-emergence in spring wheat were evaluated based on crop tolerance and control of ALS inhibitor-resistant kochia accessions with and without the glyphosate resistance trait in five environments near Lethbridge and Coalhurst, Alberta, from 2013-2015. The most effective and consistent treatments for kochia management included sulfentrazone applied pre-emergence, and fluroxypyr/bromoxynil/2,4-D or pyrasulfotole/bromoxynil applied post-emergence. All of these treatments resulted in ≥ 90% visible control in all environments and ≥ 90% kochia biomass reduction compared with the untreated control in Lethbridge 2014 and 2015. MCPA/dichlorprop-p/mecoprop-p, dicamba/2,4-D/mecoprop-p, and dicamba/fluroxypyr resulted in acceptable control among environments (≥ 80% visible control in all environments and ≥ 80% kochia biomass reduction in Lethbridge 2014 and 2015); however the latter two options caused unacceptable (> 10%) wheat visible injury in Coalhurst 2014. Recent confirmations of auxinic herbicide-resistant kochia in Western Canada – due, in part, to use of synthetic auxins to manage glyphosate-resistant kochia in small-grain cereals – will limit kochia management options. When implemented with non-chemical tools as part of an integrated weed management program, alternative herbicide modes of action like protoporphyrinogen oxidase inhibitors before and photosystem II or 4-hydroxyphenylpyruvate dioxygenase inhibitor(s) within spring wheat could mitigate selection for multiple herbicide-resistant kochia.

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“…Wicks et al (1994) documented 96% control of triazine-resistant kochia with paraquat applied as a burndown treatment prior to sorghum planting. Similarly, excellent control (>97%) of GR kochia has been reported with bromoxynil þ pyrasulfotole, bromoxynil þ fluroxypyr, paraquat, and saflufenacil alone or in combination with 2,4-D in two separate studies (Kumar et al 2014;Sbatella et al 2019). In the current study, glufosinate and a premix of 2,4-D þ bromoxynil þ fluroxypyr resulted in greater injury (96% vs. 84% averaged) to the KS-SUS than the KS-4H accession.…”

Section: Percent Visible Injurymentioning

confidence: 59%

Cross-resistance to atrazine and metribuzin in multiple herbicide-resistant kochia accessions: confirmation, mechanism, and management

Kumar

Currie

et al. 2020

Weed Technol

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Kochia accessions (designated as “KS-4A” and “KS-4H”) collected from a corn field near Garden City, KS have previously shown multiple resistance to glyphosate, dicamba, and fluroxypyr. These accessions were also suspected for resistance to photosystem (PS) II inhibitors. The main objectives of this research were to (1) confirm the co-existence of cross-resistance to PS II inhibitors (atrazine and metribuzin) applied PRE and POST, (2) investigate the underlying mechanism of PS II-inhibitor resistance, and (3) determine the effectiveness of alternative POST herbicides for control of these multiple herbicide-resistant (MHR) kochia accessions. Results from dose-response experiments revealed that the KS-4A and KS-4H kochia accessions were 23- to 48-fold resistant to PRE- and POST-applied atrazine and 13- to 18-fold resistant to POST-applied metribuzin compared to a known susceptible kochia accession (KS-SUS). Both accessions also showed putative resistance to PRE-applied metribuzin that needs to be confirmed. Sequence analyses of the psbA gene further revealed that all samples from the KS-4A and KS-4H kochia accessions had a Ser264Gly point mutation. A pretreatment of malathion followed by a POST application of atrazine at 1120 g ha-1 or metribuzin at 630 g ha-1 did not reverse the resistance phenotypes of these MHR accessions. In a separate greenhouse study, alternative POST herbicides, including bicyclopyrone + bromoxynil; bromoxynil + pyrasulfotole; paraquat alone or in combination with atrazine, metribuzin, 2,4-D, or saflufenacil; and saflufenacil alone or in combination with 2,4-D effectively controlled the KS-4H accession (≥97% injury). To our knowledge, this research reports the first case of kochia accessions with cross-resistance to PRE-applied atrazine and POST-applied metribuzin. Growers should adopt diversified weed control strategies, including the use of competitive crops, cover crops, targeted tillage, harvest weed seed control along with effective alternative PRE and POST herbicides with multiple sites of action to control MHR kochia seedbanks on their production fields.

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Herbicide options for glyphosate-resistant kochia (Bassia scoparia) management in the Great Plains

Cited by 7 publications

References 31 publications

Economics of herbicide programs for weed control in conventional, glufosinate, and dicamba/glyphosate‐resistant soybean across Nebraska

Economics of herbicide programs for weed control in conventional, glufosinate, and dicamba/glyphosate‐resistant soybean across Nebraska

Herbicide strategies for managing glyphosate-resistant and -susceptible kochia (Bassia scoparia) in spring wheat

Cross-resistance to atrazine and metribuzin in multiple herbicide-resistant kochia accessions: confirmation, mechanism, and management

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