STP1449: Determination of Organosilicone Surfactant Phytotoxicity for Selected Vegetable Species

    Sun, JS
    Senior chemist, technology manager, senior technician, OSi Specialties, Crompton Corporate, Tarrytown, NY

    Policello, GA
    Senior chemist, technology manager, senior technician, OSi Specialties, Crompton Corporate, Tarrytown, NY

    Paccione, MA
    Senior chemist, technology manager, senior technician, OSi Specialties, Crompton Corporate, Tarrytown, NY

    Pages: 8    Published: Jan 2003


    Abstract

    Surfactants are widely used as components of pesticide formulations and sprays. Generally, they are classified as “inert”, although some surfactants have been shown to cause unwanted damage to plant tissue expressed as phytotoxicity. Surfactant phytotoxicity is dependent on concentration, chemical structure, spray volume, and plant species. The mode action of surfactant phytotoxicity is still not well understood.

    The current experiments were conducted to evaluate the effect of organosilicones or blends with nonionic surfactants, on certain plants. A series of spray trials to assess the potential for surfactant phytotoxicity was conducted on several widely commercialized vegetable species.

    In addition to adjuvant type, spray volume (200 L/ha and 800 L/ha) was also evaluated as a potential source of phytotoxicity, when considered in conjucntion with adjuvant rate.

    Phytotoxic effects were not observed for standard adjuvant rates. However, excessive rates (4X normal) showed different levels of phytotoxicity, depending on adjuvant used, the crop and spray volume. One adjuvant in particular (silicone blend) was the least phytotoxic, where all treatments were essentially damage free.

    Keywords:

    Organosilicone, Trisiloxane alkoxylate, Phytotoxic, Vegetables


    Paper ID: STP11196S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP11196S


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