Rhode Island Apple IPM

1998 - Current pest report - Apple scab infection periods

Tree stage:
3/28/98 - green tip
4/1/98 - half inch green
4/14/98 - tight cluster
4/21/98 - loose cluster
4/29/98 - early bloom
5/4/98 - nearly petal fall

Apple scab infection periods:

4/8/98 - 4/10/98 : 36 hours (combining two wet periods) at an average temperature of 41

4/16/98 - 4/18/98: 36 hours at 50 degrees

4/19/98: infection period in southern RI only

4/23/98: infection period

5/4/98: infection period - continued until 5/11/98

5/17/98: release of last primary scab spores should have occurred. End of Primary scab season!