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Significance and Use
Pesticide regulations for the minimization of drift during pesticide application often require active ingredient (a.i.) product use under defined droplet size conditions. Spray performance with respect to transport and deposition of droplets and particles at target surfaces and product efficacy for desired applications are also affected by droplet size spectra. The effect of drift reduction adjuvants on droplet size spectra should be understood in this context. The present test method describes standard tests that can be conducted to investigate the performance of pesticide spray drift reduction adjuvants under simulated field use conditions for drift management decisions in the context of the entire spraying process. The measured reduction in driftable fines and shift in spray droplet size distribution can be used to reduce the buffer zones mandated by regulatory agencies.
1.1 This test method is used to characterize the performance of pesticide spray drift reduction adjuvants with respect to spray droplet size spectra, volume of fines, and other use parameters under simulated field ground application conditions. This test method does not include any procedures to evaluate if pump shear degrades the performance of the spray drift reduction adjuvant.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
Note 1—This method uses industry-standard units. The following conversions to SI units are provided for convenience: 1 mph = 1.61 kph; 1 in = 2.54 cm; 1 gal/acre = 9.36 L/hectare.
1.3 This test method does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D3825 Test Method for Dynamic Surface Tension by the Fast-Bubble Technique
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E456 Terminology Relating to Quality and Statistics
E609 Terminology Relating to Pesticides
E799 Practice for Determining Data Criteria and Processing for Liquid Drop Size Analysis
E1260 Test Method for Determining Liquid Drop Size Characteristics in a Spray Using Optical Nonimaging Light-Scattering Instruments
E1519 Terminology Relating to Agricultural Tank Mix Adjuvants
E1620 Terminology Relating to Liquid Particles and Atomization
E2408 Test Method for Relative Extensional Viscosity of Agricultural Spray Tank Mixes
ASABE StandardsASAES572.1 Spray Nozzle Classification by Droplet Spectra, March 2009
NFPA StandardsNFPA33 Standard for Spray Application Using Flammable or Combustible Materials
ICS Number Code 65.100.01 (Pesticides and other agrochemicals)
UNSPSC Code 10191500(Pesticides or pest repellents)