Tree stage for McIntosh:
4/6/99 – green tip
4/8/99 – half inch green
4/16/99 – nearly tight cluster
4/21/99 – tight cluster
4/26/99 – loose cluster
5/1/99 – pink
5/5/99 – early bloom
5/6/99 – full bloom
5/11/99 – late bloom
5/13/99 – McIntosh petal fall

End of primary apple scab season with 5/20/99 wetting period

Apple scab infection periods:

Fourth infection period: 5/18/99 through 5/20/99
Third infection period: 5/8/99
Second infection period: 5/3/99 through 5/5/99
First infection period: 4/22/99 through 4/23/99

Lesions in unsprayed trees 5/20/99. Probably from May 3-5 infection period.