Control ofAlternariaInfection of Fruit of Apple Cultivar Nittany with Calcium Chloride and Fungicides

Calcium chloride (CaCl 2 ) was tested for its efficacy in reducing the incidence and severity of infection of the apple cultivar Nittany by Alternaria spp. In 1989, eight biweekly applications of flake (referred to as CaCl 2 ) or liquid CaCl 2 reduced the incidence of rot from 61% in the controls to 27 and 33%, respectively. Dip treatments alone reduced rot incidence to 17 and 12% for the CaCl 2 and liquid CaCl 2 treatments, and seasonal sprays followed by dip treatment reduced incidence to 5% Nine CaCl 2 sprays, applied biweekly, reduced the incidence of the disease from approximately 44% in the controls to 12 and 18% in 1990 and 1991, respectively