The Mechanism of Methylated Seed Oil on Enhancing Biological Efficacy of Topramezone on Weeds

Zhang, Jinwei; Jaeck, O.; Menegat, Alexander; Zhang, Zongjian; Gerhards, Roland; Ni, Hanwen

doi:10.1371/journal.pone.0074280

Cited by 19 publications

(25 citation statements)

References 32 publications

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“…In 2019, there was no difference in velvetleaf biomass reduction among the herbicide programs evaluated. Zhang et al (2013) reported 90% velvetleaf biomass reduction with topramezone at 15.84 g ai ha -1 plus 0.3% methylated seed oil. Hart (1997) reported halosulfuron-methyl at 9 g ai ha -1 plus dicamba at 140 g ai ha -1 plus crop oil concentrate or methylated seed oil 1% vol/vol resulted in 87% velvetleaf biomass reduction.…”

Section: Biomass Reductionmentioning

confidence: 99%

Control of velvetleaf (Abutilon theophrasti) at two heights with POST herbicides in Nebraska popcorn

et al. 2020

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Velvetleaf is an economically important weed in popcorn production fields in Nebraska. Many PRE herbicides in popcorn have limited residual activity or provide partial velvetleaf control. There are a limited number of herbicides applied POST in popcorn compared with field corn, necessitating the evaluation of POST herbicides for control of velvetleaf. The objectives of this study were to (1) evaluate the efficacy and crop safety of labeled POST herbicides for controlling velvetleaf that survived S-metolachlor/atrazine applied PRE and (2) determine the effect of velvetleaf height on POST herbicide efficacy, popcorn injury, and yield. Field experiments were conducted in 2018 and 2019 near Clay Center, Nebraska. The experiments were arranged in a split-plot design with four replications. The main plot treatments were velvetleaf height (≤15 cm and ≤30 cm) and subplot treatments included a no-POST herbicide control, and 11 POST herbicide programs. Fluthiacet-methyl, fluthiacet-methyl/mesotrione, carfentrazone-ethyl, dicamba, and dicamba/diflufenzopyr provided greater than 96% velvetleaf control 28 d after treatment (DAT), reduced velvetleaf density to fewer than 7 plants m−2, achieved 99% to 100% biomass reduction, and had no effect on popcorn yield. Herbicide programs tested in this study provided greater than 98% control of velvetleaf 28 DAT in 2019. Most POST herbicide programs in this study provided greater than 90% control of up to 15 cm and up to 30 cm velvetleaf and no differences between velvetleaf heights in density, biomass reduction, or popcorn yield were observed, except with topramezone and nicosulfuron/mesotrione 28 DAT in 2018. On the basis of contrast analysis, herbicide programs with fluthiacet-methyl or dicamba provided better control than herbicide programs without them at 28 DAT in 2018. It is concluded that POST herbicides are available for control of velvetleaf up to 30-cm tall in popcorn production fields.

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Section: Biomass Reductionmentioning

confidence: 99%

Control of velvetleaf (Abutilon theophrasti) at two heights with POST herbicides in Nebraska popcorn

et al. 2020

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“…Tolpyralate + atrazine + MSO provided the greatest control of GR Canada fleabane at 2 and 4 WAA, and waterhemp at 4 WAA. The increased herbicidal activity observed with the addition of MSO may be attributed to the greater absorption and retention of the herbicide on plant leaf as a result of various physical and chemical changes to the herbicide solution [31] [41]. Reduced surface tension and contact angle of spray droplets promote the penetration of herbicides through the leaf cuticle [31].…”

Section: Discussionmentioning

confidence: 99%

“…The increased herbicidal activity observed with the addition of MSO may be attributed to the greater absorption and retention of the herbicide on plant leaf as a result of various physical and chemical changes to the herbicide solution [31] [41]. Reduced surface tension and contact angle of spray droplets promote the penetration of herbicides through the leaf cuticle [31]. Herbicidal activity of topramezone and isoxaflutole, two other Group 27 herbicides, is also improved with the addition of MSO [31] [41].…”

Section: Discussionmentioning

confidence: 99%

“…Reduced surface tension and contact angle of spray droplets promote the penetration of herbicides through the leaf cuticle [31]. Herbicidal activity of topramezone and isoxaflutole, two other Group 27 herbicides, is also improved with the addition of MSO [31] [41]. Hutchinson et al [42] found that MSO enhanced activity of metribuzin, resulting in greater control of lambsquarters, hairy nightshade, redroot pigweed and kochia when compared to nonionic surfactants.…”

Section: Discussionmentioning

confidence: 99%

“…Many herbicides require the addition of an adjuvant for optimal performance. Topramezone, another Group 27 herbicide, has enhanced efficacy with the addition of MSO due to increased absorption and translocation of the herbicide in the plant [31]. Quinclorac efficacy is enhanced with the addition of MSO and a nitrogen fertilizer that combats antagonistic salts present in the carrier water [32].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Adjuvants on the Control of Glyphosate-Resistant Canada Fleabane and Waterhemp in Corn with Tolpyralate

Langdon¹,

Soltani²,

Raedar³

et al. 2020

AJPS

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Tolpyralate is a new benzoylpyrazole herbicide for weed management in corn. It is recommended to be co-applied with atrazine along with the adjuvants methylated seed oil concentrate (MSO) plus an ammonium nitrogen fertilizer, such as urea ammonium nitrate (UAN). Two studies were conducted on glyphosate-resistant (GR) Canada fleabane and GR waterhemp to determine if an additional adjuvant is still required when tolpyralate plus atrazine are tankmixed with a commercial glyphosate formulation (Roundup WeatherMAX®) in corn. Trials were conducted over a two-year period (2018-19) on farms in south western Ontario with confirmed GR populations. When co-applied with Roundup WeatherMAX®, the addition of MSO to tolpyralate + atrazine increased control of GR waterhemp 9%; however, there was no increase in GR Canada fleabane control from the addition of additional adjuvants. At 8 WAA, all treatments provided > 91% and > 84% control of GR waterhemp and GR Canada fleabane, respectively. This study concludes that the addition of Roundup Weathermax® to tolpyralate plus atrazine improves the control of GR waterhemp and GR Canada fleabane in corn.

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First report of severe tolpyralate sensitivity in corn (Zea mays) discovers a novel genetic factor conferring crop response to a herbicide

Williams,

Hausman,

Saballos

et al. 2023

Pest Management Science

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BACKGROUNDTolpyralate, a relatively new inhibitor of 4‐hydroxyphenylpyruvate dioxygenase (HPPD), is registered for postemergence use in all types of corn (Zea mays L.) and has a record of excellent crop tolerance. A report of severe crop injury to sweet corn inbred (XSEN187) led to the following objectives: (i) determine whether sensitivity to tolpyralate in XSEN187 exists, and if confirmed, (ii) determine the genetic basis of tolpyralate sensitivity, and (iii) screen other corn germplasm for sensitivity to tolpyralate.RESULTSInbred XSEN187 was confirmed sensitive to tolpyralate. Inclusion of methylated seed oil or nonionic surfactant in the spray volume was necessary for severe crop injury. Tolpyralate sensitivity in XSEN187 is not conferred by alleles at Nsf1, a cytochrome P450‐encoding gene (CYP81A9) conferring tolerance to many corn herbicides. Evidence suggests that tolpyralate sensitivity in XSEN187 is conferred by a single gene mapped to the Chr05: 283 240–1 222 909 bp interval. Moreover, tolpyralate sensitivity was observed in 48 other sweet corn and field corn inbreds.CONCLUSIONSSevere sensitivity to tolpyralate exists in sweet corn and field corn germplasm when the herbicide is applied according to label directions. Whereas the corn response to several other herbicides, including HPPD‐inhibitors, is conferred by the Nsf1 locus, corn sensitivity to tolpyralate is the result of a different locus. The use of tolpyralate should consider herbicide tolerance in inbred lines from which corn hybrids were derived, whereas alleles that render corn germplasm sensitive to tolpyralate should be eliminated from breeding populations, inbreds, and commercial cultivars. © 2023 Illinois Foundation Seeds, Inc and The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.

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The Mechanism of Methylated Seed Oil on Enhancing Biological Efficacy of Topramezone on Weeds

Cited by 19 publications

References 32 publications

Control of velvetleaf (Abutilon theophrasti) at two heights with POST herbicides in Nebraska popcorn

Control of velvetleaf (Abutilon theophrasti) at two heights with POST herbicides in Nebraska popcorn

Influence of Adjuvants on the Control of Glyphosate-Resistant Canada Fleabane and Waterhemp in Corn with Tolpyralate

First report of severe tolpyralate sensitivity in corn (Zea mays) discovers a novel genetic factor conferring crop response to a herbicide

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