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    Pesticide Compatibility: An Overview from Technical Services

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    Pesticidal formulations are divided into various delivery systems. Examples are water-soluble liquids, emulsifiable concentrates, wettable powders, flowable suspensions, and dispersible granules. These formulations are individually developed for a specific pesticide compound and must be easily diluted and sprayed by the applicator. Often, field tank mixing of multiple pesticide formulations or pesticide formulations in liquid fertilizers is performed to broaden efficacy and reduce application costs. Physical and chemical incompatibility sometimes occurs with these mixtures, causing activity loss, uneven spraying, and nozzle clogging. Compatibility problems can frequently be avoided by using clean equipment, pretesting the mixture in a small jar, and adding one of the many commercially available compatibility agents to the spray tank. Pesticide mixtures that have inadvertently developed problems in the field can sometimes be rejuvenated by chemical and spray equipment adjustments. Applicators are reminded that strict adherence to product label statements for tank mixing is mandated by the U.S. Environmental Protection Agency.


    agricultural formulation, compatibility agent, dispersible granule, emulsifiable concentrate, flowable suspension, liquid fertilizer, pesticides, pesticide tank mixing, tank mix applications, water-soluble pesticide, wettable powder

    Author Information:

    Houghton, RD
    Agricultural formulations chemist, Rohm and Haas Co., Research Division, Spring House, Pa.

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP29337S