Apple scab, the most important disease of apple worldwide, is caused by Venturia inaequalis. Currently, evaluation of fungal pathogenicity and host resistance is based on a symptomatic disease rating. However, this method does not provide an accurate measurement of the degree of infection and cannot detect early fungal development in symptomless leaves. In . . . → Read More: Real-time PCR as a promising tool to monitor growth of Venturia spp. in scab-susceptible and -resistant apple leaves