I have been receiving quite a few questions about the application of chlorothalonil and oil. This dormant spray has been shown to be highly effective in reducing in season scab, as well as delaying the sporulation of the pathogen, making in-season fungicide sprays more effective. Q. The work by Dr. Adaskaveg shows 6 pts, the product is only registered for four (winter, 2013)…is the 4pt rate effective?