We recorded a 23-hr scab and cedar-apple rust infection period at our AREC March 27-28. Examination of rust galls indicated that cedar-apple rust basidiospores had discharged and some rust infection was likely. Apple bud stage ranged from 1/4-inch green tip to nearly open cluster on the most advanced varieties. Exposed blossoms are now also susceptible to quince rust. Hopefully, moderate wind conditions Thursday, March 30 will facilitate catching up with priority fungicide applications!
Apple powdery mildew conidia were produced earlier this week, and March 30 will be a likely mildew infection day.
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
