STP1328

    Linear Alcohol Ethoxylates Affect Glyphosate and Fluazifop-P Deposits

    Published: Jan 1997


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    Abstract

    Scanning electron micrographs were taken of spray droplet residues from glyphosate (Honcho®) and fluazifop-P (Fusilade 2000®) applied with linear alcohol ethoxylates (LAE) having linear alcohol chains with C8–10, C12–14, and C16–18 and ethylene oxides (EO) at 40–46, 60–62, and 80% of surfactant molecular weight. Glyphosate spray applied with high HLB, 80% EO, LAE gave a uniform thick deposit. LAE which formed these distinct deposits with close contact to the leaf related to previously reported high glyphosate phytotoxicity to wheat. Fluazifop-P spray residual characteristics did not relate closely to efficacy. However, LAE that gave more uniform deposits were associated with the greatest fluazifop-P phytotoxicity. Fluazifop-P formulants may have reduced the LAE effect on spray droplet deposit. Glyphosate was a formulation without surfactant. Generally, fluazifop-P residuals were almost not discernable when applied with LAE C8–10 and C12–14 with 40–46% EO, the least effective LAE for enhancement of fluazifop-P phytotoxicity to wheat. Surfactant affect on spray droplet deposit in addition to previously reported solubility characteristics appear important to enhancement of glyphosate and fluazifop-P phytotoxicity.

    Keywords:

    adjuvants, scanning electron micrographs, spray deposit


    Author Information:

    Nalewaja, JD
    Professor and Visiting Scientist, Plant Sciences, North Dakota State University, Fargo, ND

    Matysiak, R
    Professor and Visiting Scientist, Plant Sciences, North Dakota State University, Fargo, ND


    Paper ID: STP13848S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP13848S


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