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Purple Nutsedge (Cyperus rotundus) Management in Direct-Seeded Chile Pepper Using Halosulfuron and Cultivation

Published online by Cambridge University Press:  20 January 2017

Justin H. Norsworthy ,
Jill Schroeder ,
Stephen H. Thomas  and
Leigh W. Murray
Justin H. Norsworthy
Affiliation:
Department of Entomology, Plant Pathology, and Weed Science, New Mexico State University, Las Cruces NM, 88003-0003
Jill Schroeder*
Affiliation:
Department of Entomology, Plant Pathology, and Weed Science, New Mexico State University, Las Cruces NM, 88003-0003
Stephen H. Thomas
Affiliation:
Department of Entomology, Plant Pathology, and Weed Science, New Mexico State University, Las Cruces NM, 88003-0003
Leigh W. Murray
Affiliation:
University Statistics Center, New Mexico State University, Las Cruces NM, 88003-0003
*
Corresponding author's E-mail: [email protected]
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Abstract

Field research was conducted in southern New Mexico to determine the effect of halosulfuron rate, timing of application, and adjuvant on purple nutsedge suppression and chile pepper injury under cultivated conditions. POST-directed treatments of 36 or 53 g ai/ha were applied 2 or 4 wk after thinning direct-seeded chile pepper. Herbicide treatments included a nonionic surfactant or methylated seed oil plus ammonium sulfate plus polyacrylamide polymer. Herbicide rate, adjuvant, and timing of the application had little effect on overall nutsedge suppression; however, herbicide treatment proved to be an important component for managing purple nutsedge in this experiment. Yields were higher with halosulfuron treatment compared with the weedy control. Whereas halosulfuron treatment with 53 g/ha increased chile yield relative to the weedy control, injury and yield results comparing 36 and 53 g/ha rates consistently suggested that halosulfuron should be applied at rates ≤ 36 g/ha in a single application to avoid possible injury. Halosulfuron treatment combined with cultivation and effective crop rotation may reduce the impact of purple nutsedge interference in chile pepper.

Keywords

Halosulfuronpurple nutsedge, Cyperus rotundus L. CYPROchile pepper, Capsicum annuum L. ‘Sandia’ALS herbicideCapsicum annuumCYPRO
Type
Research
Information
Weed Technology , Volume 21 , Issue 3 , September 2007 , pp. 636 - 641
Copyright
Copyright © Weed Science Society of America 

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