Control of powdery mildew of parsley by UV-B radiation

Abstract

Even if parsley is irradiated by UV-B to 60.0 μw/cm², its growth is not influenced. We controlled powdery mildew by irradiation at more than 9.0 μw/cm². However, when there are many sources of infection, UV-B cannot control it. We effectively restricted powdery mildew growth, by a combination of fatty acid glyceride emulsion and sodium bicarbonate·copper wettable powder applied for 3 weeks.