Heavy apple scab, cedar-apple rust and quince rust infection period Apr 14-15

We recorded a heavy apple scab, cedar-apple rust and quince rust infection period with wetting starting at 2 AM Apr 14 and still not quite dry at 9 AM Apr 15. Temperatures ranged from 70 F to 45 F with 18 hours above 55 F. Total rainfall was 0.62 inches. Apples in the Winchester area are mostly at open cluster stage with Yorks at tight cluster this morning. Rust galls and cankers actively discharged spores and blossoms are susceptible to quince rust by the tight cluster stage; leaves and blossoms are susceptible to cedar-apple rust. This time similar wetting conditions, but with variable amounts of rainfall, occurred over most Virginia fruit areas.

Some central Virginia apples came into bloom by Apr 11 showed Maryblyt infection conditions for the night of Apr 13. This would generally be true for any areas that came into bloom by Apr 11 and had rain the night of Apr 13.