Scab infection periods occurred May 21-22 (22 hr at 67°) and May 22-23 (12 hr at 64°). Total rainfall for these two events was 0.26 in. at our AREC but some other areas of Frederick County received considerably more rain volume, especially on the evening of May 22.
These wetting periods at relatively warm temperatures could signal early summer disease pressure. Through this morning we had accumulated 222 wetting hours since Apr 18, rapidly advancing toward the 250 wetting hour threshold for specific treatment against the sooty blotch/flyspeck fungal complex.
Cherry leaf spot symptoms were observed today.
Disease management information directed mostly to the Frederick County Virginia tree fruit industry, updated as needed throughout the growing season. Keith Yoder, Virginia Tech Agricultural Research and Extension Center, Winchester, Virginia
About Me
- Keith Yoder
- Professor Emeritus of Plant Pathology, Virginia Tech Ag. Research and Extension Center, Winchester, VA
