Published: Dec 2011
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Drift Reduction Agent has been defined in ASTM Standard E1519 Terminology Relating to Agricultural Tank Mix Adjuvants as “a material used in liquid spray mixtures to reduce spray drift.” ASTM Standard E609 Terminology Relating to Pesticides defines drift as “the physical movement of an agrochemical through the air at the time of application or soon thereafter to any non- or off-target site. Drift shall not include movement to non- or off-target sites caused by erosion, migration, volatility or wind blown soil particles that occur after application unless specifically advertised on the label.” Because there are many commercial tank mix adjuvants designed to reduce spray drift, there is a need to establish an ASTM Standard Test Method to evaluate their effectiveness. ASTM Standard E2798 is the new test method developed for the Characterization of Performance of Pesticide Spray Drift Reduction Adjuvants for Ground Application. This paper presents the data generated from the round-robin testing of this method. The method provides guidelines for the measurement of parameters pertaining to the performance of drift reduction adjuvants under simulated field application conditions. The measurements can be made in a wind tunnel or a spray chamber. The method describes the preparation, composition, and test/application conditions for droplet size, spray pattern measurements, and fines reduction. The exact selection of application conditions such as nozzle type and tank mix partner may vary according to the intended use conditions.
tank mix adjuvant, spray drift, drift reduction, drift control, aerosol particle size, glyphosate
Elsik, Curtis M.
Huntsman Corp., The Woodlands, TX