Droplet Chart / Selection Guide
Robert D. Grisso · 2019
Chart 1. Droplet range for application/pest control 1 .Application Droplet Category 2 Approximate VMD Range 3 (in microns) Fungicide foliar protective or curative Medium (M) 236-340 Insecticide foliar contact or stomach poison Medium (M) 236-340 foliar systemic Coarse (C) 341-403 soil-applied systemic Coarse (C) 341-403 404-502 503-665 >665 Very Coarse (VC) Extremely Coarse (XC) Ultra Coarse (UC) Herbicide foliar/post-emergent contact Medium (M) 236-340 foliar/post-emergent systemic Coarse (C) 341-403 soil-applied/pre-emergent systemic Coarse (C) 341-403 404-502 503-665 >665 Very Coarse (VC) Extremely Coarse (XC) Ultra Coarse (UC) 1 Always read the label.Pesticide product labels may specify what droplet size to use, which will direct nozzle selection and, in turn, affect spraying equipment configuration and calibration.2 ASABE (American Society of Agricultural & Biological Engineers) Standard 572.2 July 2018.3 Reported VMD ranges vary widely, based upon the type of laser analyzer used.VMD = Volume Median Diameter: a value where 50% of the total VOLUME or mass of liquid sprayed is made up of droplets LARGER than and 50% SMALLER than this value.www.ext.vt.