The aim of this study was to assess a control level to determine the beginning of fungicide use in the management of Marssonina Apple Blotch (MAB). The proposed method consisted in the weekly monitoring of 20 apple trees and, when the disease symptoms were detected in four plants, fungicide spraying started at 10-day intervals. All treatments controlled MBA incidence and severity on the leaves. The use of the control level for MBA reduced the number of fungicide sprayings by 23%, compared to the treatments performed by farmers using the conventional method.
Malus domestica Borkh; Marssonina coronaria; Marssonina apple blotch; summer diseases
