Chemical control of rose diseases. III. Effectiveness of fungicides in the control of powdery mildew in relation to spray methods or spray-liquid temperature.

摘要

The effectiveness of different spraying methods and the influence of spray-liquid temperature on the activity of Saprol (20% triforine), Sportak Alpha 380 EC (300 g/l prochloraz + 80 g/l carbendazim) and Topas MZ 61 WP (1.25% penconazole + 59.75% mancozeb) in the control of Sphaerotheca pannosa var. rosae on roses (cv. Mercedes) were evaluated in greenhouse experiments in 1995. When both leaf sides were covered with fungicide the efficacy was significantly increased compared with application to oneside only. Control of disease was greater when the fungicide was applied at a higher temperature (20 and 30鳦 compared with 10?.