In Portugal pear production is located in the Midwest region, occupying an area of about 11000 ha, under the registered designation of origin of “Pera Rocha do Oeste”. In recent years, the incidence of brown spot disease (Stemphylium vesicarium) increased, with considerable losses to the growers due to the depreciation of pears both in the orchards and in refrigeration chambers. The control of the disease based...