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Evaluation of POST-Directed Applications of Flumioxazin in New Mexico Chile Pepper

Published online by Cambridge University Press:  20 November 2018

Brian J. Schutte Open the ORCID record for Brian J. Schutte [Opens in a new window] ,
Erik A. Lehnhoff  and
Leslie L. Beck
Brian J. Schutte*
Affiliation:
Associate Professor, Department of Entomology, Plant Pathology and Weed Science, New Mexico State University, Las Cruces, NM, USA
Erik A. Lehnhoff
Affiliation:
Assistant Professor, Department of Entomology, Plant Pathology and Weed Science; New Mexico State University, Las Cruces, NM, USA
Leslie L. Beck
Affiliation:
Assistant Professor; Department of Extension Plant Sciences; New Mexico State University, Las Cruces, NM, USA
*
Author for correspondence: Brian Schutte, Department of Entomology, Plant Pathology and Weed Science, New Mexico State University, 945 College Avenue, Las Cruces, NM, 88003. (E-mail: [email protected])
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Abstract

The objective for this study was to determine if POST-directed applications of flumioxazin reduce fruit yield for chile pepper produced on coarse- and fine-textured soils irrigated by furrow. This objective was addressed with a multiyear (2015, 2016, 2017) field study that compared flumioxazin effects on fruit yield against a commercial standard (POST-directed carfentrazone) and the absence of a POST-directed herbicide. The field study occurred at two university research farms that differed in soil texture. On fine-textured soil, treatments included the no POST–directed herbicide control and the following four POST-directed herbicides applied to raised beds: (1) flumioxazin at 107 g ai ha–1 applied 4 wk after crop thinning, (2) carfentrazone at 35 g ai ha–1 applied 4 wk after crop thinning, (3) flumioxazin at 70 g ai ha–1 applied 4 and 6 wk after crop thinning, (4) carfentrazone at 35 g ai ha–1 applied 4 and 6 wk after crop thinning. On coarse-textured soil, treatments included the no POST–directed herbicide control and the following three POST-directed herbicides applied 4 wk after crop thinning: (1) flumioxazin at 107 g ai ha–1 applied to raised beds, (2) flumioxazin at 107 g ai ha–1 applied to furrows, (3) carfentrazone at 35 g ai ha–1 applied to raised beds. On fine-textured soil, treatment did not affect fruit yield. On coarse-textured soil, flumioxazin applied to furrows did not reduce fruit yield, but flumioxazin on raised beds reduced fruit yield of some cultivars in 2015 and 2017. Year-to-year variability in both flumioxazin-induced yield loss and soil characteristics suggested that chile pepper sensitivity to flumioxazin was negatively associated with soil organic matter content. In a follow-up greenhouse study, soil organic matter lessened flumioxazin-induced crop injury. In general, this study indicates that recommendations for POST-directed flumioxazin in New Mexico chile pepper will need to be soil-type specific.

Keywords

Steve Fennimore, University of California, DavisCarfentrazoneflumioxazinchile pepper, Capsicum annuum LHerbicide injurypreemergencevegetableweed control
Type
Research Article
Information
Weed Technology , Volume 33 , Issue 1 , February 2019 , pp. 135 - 141
Copyright
© Weed Science Society of America, 2018 

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Footnotes

Cite this article: Schutte BJ, Lehnhoff EA, Beck LL (2018) Evaluation of POST-directed applications of flumioxazin in New Mexico chile pepper. Weed Technol 33:135–141. doi: 10.1017/wet.2018.83

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