Spray drift: An investigation of the relationship between field, wind tunnel measurements and model predictions for determining drift reduction

M C Butler Ellis, R Alanis, A Lane, C R Tuck, David Nuyttens, J C van de Zande

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    It is important to be able to make accurate predictions of the potential for pesticide sprays to deposit on adjacent off-target habitats in order to make sound regulatory decisions that protect the environment. In the 1990’s, the USA Spray Drift Task Force (SDTF) conducted a comprehensive program of field drift studies and the resulting data were used to generate
    models for traditional aerial, ground and airblast application methods. The data generated for airblast applications however, were limited and do not reflect todays agricultural practices. The main conclusion from the SDTF work was that droplet size was one of the primary drivers behind drift followed by canopy type. The current conservative drift fraction used by US EPA for airblast applications assumes an aerosol/very fine droplet size and sparse young dormant trees (a composite of small grapefruit and dormant apple orchards).
    There are, however, a number of drift data sets available internationally for regulatory use. This paper describes the database development and the subsequent extraction of large amounts of drift data gathered across the international community and pooled to more confidently address the effects of, in this case, canopy density and low drift air induction nozzle on downwind deposition of pesticides. The results highlight that crop canopy and drift reducing techniques significantly reduce drift potential. Moreover the accumulation of data into one central depository could be useful to further research and regulatory decisions in this area.
    TaalEngels
    TitelAspects of Applied Biology : International Advances in Pesticide Application
    EditorsP. Balsari, S.E. Cooper, E. Gil, C.R. Glass, W. Jones, B. Magri, P.C.H. Miller, C. Mountford-Smith, D. Nuyttens, T.H. Robinson, D. Stock, W.A. Taylor, J. van de Zande
    Aantal pagina's10
    Volume132
    UitgeverijAssociation of Applied Biologists
    Datum2016
    Pagina's207-216
    ISBN van geprinte versie0265-1491
    StatusGepubliceerd - 2016

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