Summary: The objectives of this project were: 1. Determine the prevalence and incidence of Sphaeropsis rot as well as other postharvest diseases on major apple varieties under various handling systems (traditional drench, MCP, etc.). 2. Determine the sources of inoculum of the Sphaeropsis fungus in the orchard. 3. Test sensitivity of the fungus to various fungicides. 4. Evaluate effectiveness of preharvest fungicides and postharvest drench in controlling Sphaeropsis rot.
