Postharvest physiological disorders, diseases and mineral concentrations of organically and conventionally grown McIntosh and Cortland apples

Abstract

Environmental effects and human health risks associated with synthetic chemicals has prompted several apple growers to convert to organic production. Postharvest physiological disorders, diseases and mineral concentrations of organically and conventionally grown McIntosh and Cortland apples stored in refrigerated (3 °C) ambient air and controlled atmospheres were evaluated for 2 consecutive years. More of the conventionally grown apples were marketable after storage. Organically grown apples had higher incidence of storage rots, apple scab and russetting. Production method did not influence core browning. Organically grown McIntosh stored in ambient air for 8 mo had the highest incidence of senescent breakdown. Conventionally grown McIntosh stored in CA for 8 mo had the highest incidence of internal browning. Conventionally grown McIntosh stored in air had a higher incidence of scald than organically grown McIntosh. After 4 mo of storage in air, organically grown McIntosh had a higher incidence of splitting. Production method did not influence calcium or magnesium concentrations. Organically grown apples had higher phosphorus and potassium concentrations and lower nitrogen concentrations. Key words: Malus domestica, organic apple production, controlled atmosphere, storage disorders, storage rots, whole fruit mineral concentrations