Scab and possible rust infection period

We recorded a definite apple scab infection period at our AREC last night, with wetting from 4 PM Apr 7 until at least 9 AM this morning Apr 8, and temperatures ranging from 67 to 46 F with 0.4 inch of rain. Some cedar-apple rust and quince rust spores were also released, and where trees were not well protected, a follow-up spray including an SI fungicide is suggested for after-infection rust control.

Most apple tree cultivars are at tight cluster stage, a pretty large target, as shown on Golden Delicious below:

Drying is not very good today so these conditions may continue on into tonight.