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    STP1602

    Increase in Herbicide Efficacy Using High Surfactant Oil Concentrate Adjuvants

    Published: 2018


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    Abstract

    High surfactant oil concentrate (HSOC) adjuvants were developed to enhance lipophilic herbicides without antagonizing hydrophilic herbicides. The oil was either a methylated seed oil (HSMOC) or petroleum oil (HSPOC). HSOC adjuvants contained a minimum of 50 % oil with 25 % to 50 % emulsifier surfactant. The purpose of this study was to screen multiple HSOC adjuvants to quantify their relative effectiveness when applied with glyphosate mixed with either dicamba or tembotrione. Reduced rates of glyphosate at 473 g ai ha−1, dicamba at 214 g ai ha−1, and tembotrione at 46 g ai ha−1 were applied with HSOC adjuvants at 1,170 mL ai ha−1. HSOC adjuvants increased the efficacy of the tank mixes glyphosate plus dicamba and glyphosate plus tembotrione. There were few statistical differences between all HSOC adjuvants and within HSMOC and HSPOC groups. In both trials, HSMOC adjuvants increased the efficacy of the tank mix more than the HSPOC adjuvants. However, the performance of an HSOC varies depending on the herbicide tank mix.

    Keywords:

    high surfactant oil concentrate, HSOC, HSMOC, HSPOC, adjuvant, oil, surfactant, efficacy


    Author Information:

    Wirth, Devin
    North Dakota State University, Department of Plant Sciences, Fargo, ND

    Zollinger, Richard K.
    North Dakota State University, Department of Plant Sciences, Fargo, ND


    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP160220170017