Apple scab is a serious problem in humid climates, and McIntosh is very susceptible. Lesions occur on both leaves and fruit. Apple growers have three new fungicides they can use to control apple scab, and Dr. George Sundin would like to see growers keep them. “Use full covers and full rates,” he said. “Kill the pathogen. Resistance management is resistance prevention.” Sundin, who is Michigan State University’s tree fruit pathologist, spoke to growers at several events this winter. “We can’t afford to lose good fungicides every seven years,” he told them. “The chemical companies have invested a lot of money […]