Full coverage at full rates helps prevent apple scab from becoming resistant to fungicides. 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 andfull 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 everyseven years," he told them. "The chemical companies have invested a lot of money in these new fungicides, and they say they don't have anything new in the pipeline. We want to save these, so they'll still be effective in 20 years."
展开▼
