Pathosystem management of powdery mildew in winter wheat

Winter wheat cropping has changed considerably over the years 1974-1986 in The Netherlands. Yield has been increased from 5 to 8 ton/ha, due to short strawed cultivars and higher levels of agrochemical inputs. The changes were described. Epidemics and damage relations of powdery mildew were studied, to construct an advisory system.In surveyed fields, mildew intensity in spring was correlated with mean temperature in October and with the average temperature during December, January, February and March and with the susceptibility of the cultivars grown. The development of mildew during May-July... Mehr ...