Advice for bush and tree crop sprayer / compiled by: SPISE Technical Working Group 6 ; authors: Paolo Balsari (University of Turin, Italy), Andreas Herbst (Julius Kühn Institute, Germany), Jan Langenakens (A.A.M.S. NV, Belgium) ; editor-in-chief: Prof. Paolo Balsari, University of Turin ; publisher: Julius Kühn Institute - Federal Research Centre for Cultivated Plants