Efficacy evaluation of pneumatic solid set canopy delivery system to control powdery mildew (Erysiphe necator) in Washington vineyards

Despite lower spray coverage in PSD-SSCDS, the accumulated AUDPC for cluster disease severity was similar to GC treatments in both growing seasons. However, foliar disease severity differed significantly, with GC showing less disease than PSD-SSCDS. These study findings indicate that optimal emitter selection is crucial for achieving enhanced spray performance and effective disease control using the PSD-SSCDS technology in vineyards. Both fungicide spray treatments effectively protected clusters from powdery mildew, indicating PSD-SSCDS as an emergent alternative spray technology. © 2026 The Author(s). Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.