STP1078

    Pesticide Delivery Systems: Spray Distribution and Partitioning in Plant Canopies

    Published: Jan 1990


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    Abstract

    Considering only a small fraction of pesticidal sprays reaches the target, more attention needs to be placed on developing techniques which increase crop canopy penetration. Quantification of where pesticides are going is clearly going to be emphasized by EPA as a mandatory process for all future registrants. Drift represents a loss of chemical and implies dangers of air and water pollution. A critical problem is orchard airblast sprayer applications. Plant coverage by 3 boom sprayers was evaluated on tomatoes. Partitioning and overall canopy distribution, was measured by % area covered via image analysis. Similiarly, partitioning and distribution of sprays from a modified airblast sprayer was evaluated using water sensitive paper. On field grasses, paraquat applied at recommended field rates was used to measure efficacy and drift damage with the electrostatic nozzle charged vs. a conventional hydraulic nozzle. In short grass, charged was superior to uncharged whereas in long grass, both were superior to other treatments. In the laboratory, drift was reduced by 99.0% by shrouding and charging electrostatic (ENS) nozzles. The ramifications of sampling method, distribution inconsistencies, and biological effects are discussed. These results in combination with capture efficiency studies will allow future studies on spray accountancy to proceed in accordance with EPA SOP standards (40CRF, 158.142).

    Keywords:

    Atomizers, canopy partitioning, image analysis


    Author Information:

    Hall, FR
    Head of the Laboratorygraduate research associateagricultural engineerplant pathologist, Pest Control Application Technology (LPCAT)USDA/ARSOhio Agricultural Research and Development Center, The Ohio State UniversityParker-Hannifin Corp., Cleveland, OH

    Reed, JP
    Head of the Laboratorygraduate research associateagricultural engineerplant pathologist, Pest Control Application Technology (LPCAT)USDA/ARSOhio Agricultural Research and Development Center, The Ohio State UniversityParker-Hannifin Corp., Cleveland, OH

    Reichard, DL
    Head of the Laboratorygraduate research associateagricultural engineerplant pathologist, Pest Control Application Technology (LPCAT)USDA/ARSOhio Agricultural Research and Development Center, The Ohio State UniversityParker-Hannifin Corp., Cleveland, OH

    Riedel, RM
    Head of the Laboratorygraduate research associateagricultural engineerplant pathologist, Pest Control Application Technology (LPCAT)USDA/ARSOhio Agricultural Research and Development Center, The Ohio State UniversityParker-Hannifin Corp., Cleveland, OH

    Lehtinen, J
    Head of the Laboratorygraduate research associateagricultural engineerplant pathologist, Pest Control Application Technology (LPCAT)USDA/ARSOhio Agricultural Research and Development Center, The Ohio State UniversityParker-Hannifin Corp., Cleveland, OH


    Paper ID: STP25381S

    Committee/Subcommittee: E35.22

    DOI: 10.1520/STP25381S


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