1. Laboratory of Crop Protection Chemistry, Faculty of Bioscience Engineering; Department of Crop Protection, Ghent University; Ghent Belgium
2. Alterra, Wageningen University and Research Centre; 6700 AA Wageningen The Netherlands
3. Silsoe Spray Applications Unit; Wrest Park; Silsoe Bedford UK
4. Institute for Agricultural and Fisheries Research (ILVO), Technology and Food Sciences; Agricultural Engineering; Merelbeke Belgium