Suppression of Powdery Mildews by UV-B: Application Frequency and Timing, Dose, Reflectance, and Automation.

Disease-suppressive effects of nighttime applications of ultraviolet-B (UV-B) were investigated at two irradiance levels (1.6 or 0.8 W/m) in strawberry and rosemary plants inoculated with Podosphaera aphanis or Golovinomyces biocellatus, respectively.