Apple scab, cedar-apple rust, and quince rust spores were mature Apr 12, but 12 hours' wetting was probably not quite long enough at 51-55° to cause significant infection by these diseases.
However, powdery mildew spores were also available under favorable dry weather infection conditions Thursday, Apr 11.
Oh yes, speaking of rust conditions, the mystery disease below was caused by one of the rusts, most likely quince rust. This resulted in small mummified fruits and a potential carry-over of bitter rot inoculum for fruit infection this year.
