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Doveweed (Murdannia nudiflora) response to metsulfuron-methyl, trifloxysulfuron-sodium, and bentazon combinations

Published online by Cambridge University Press:  09 October 2019

Shaun M. Sharpe Open the ORCID record for Shaun M. Sharpe [Opens in a new window]  and
Nathan S. Boyd
Shaun M. Sharpe
Affiliation:
Postdoctoral Associate, University of Florida, Gulf Coast Research and Education Center, Wimauma FL, USA
Nathan S. Boyd*
Affiliation:
Associate Professor, University of Florida, Gulf Coast Research and Education Center, Wimauma FL, USA
*
Author for correspondence: Nathan S. Boyd, University of Florida, Gulf Coast Research and Education Center, 14625 County Road 672, Wimauma FL 33598. (Email: [email protected])
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Abstract

Doveweed is a problematic weed species in many agricultural ecosystems as well as on roadsides and rights-of-way. Effective POST chemical control options for doveweed are limited in many cropping systems. Greenhouse studies were conducted to evaluate the effectiveness of metsulfuron-methyl dose and the impact of mixtures and sequential applications of either trifloxysulfuron-sodium or bentazon with metsulfuron-methyl for doveweed control. By 14 d after the initial treatment, applying 0.04 kg ai ha−1 metsulfuron-methyl, either once or sequentially, provided 100% control of doveweed. Application of trifloxysulfuron-sodium at 0.04 kg ai ha−1 alone or in mixture with metsulfuron-methyl (0.04 kg ha−1) did not provide consistent doveweed control nor did it reduce biomass. Trifloxysulfuron-sodium applied alone at 0.08 kg ha−1 or in a mixture with metsulfuron-methyl (0.04 kg ha−1) provided consistent doveweed control (>80%). A single application of bentazon (0.56 kg ai ha−1) was ineffective at controlling doveweed. A single application of the bentazon and metsulfuron-methyl mixture (0.56 + 0.04 kg ha−1, respectively) or sequential applications of either bentazon alone (0.56 kg ha−1) or in mixture with metsulfuron-methyl (0.04 kg ha−1) provided excellent doveweed control (100%) by 35 d after treatment. Overall, single applications of metsulfuron-methyl (0.02 to 0.17 kg ha−1) or mixtures of metsulfuron-methyl with trifloxysulfuron-sodium (0.04 + 0.08 kg ha−1, respectively) or bentazon (0.04 + 0.56 kg ha−1, respectively) controlled doveweed and may be useful for enhancing the control spectrum for other weeds. Sequential applications of the bentazon and metsulfuron-methyl mixture (0.56 + 0.04 kg ha−1, respectively) provided doveweed control and are a resistance-management strategy for doveweed.

Keywords

Drew Lyon, Washington State UniversityMetsulfuron-methyltrifloxysulfuron-sodiumbentazondoveweedMurdannia nudiflora (L.) Brenan MUDNUMixturessequential applicationsbiomassdamage
Type
Research Article
Information
Weed Technology , Volume 34 , Issue 2 , April 2020 , pp. 260 - 265
Copyright
© Weed Science Society of America, 2019

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