Rhode Island Apple IPM

2003 - Current pest report - Apple scab infection periods

McIntosh Tree stage:
4/14/03 - green tip
4/21/03 - half inch green
4/28/03 - tight cluster
5/5/03 - full pink
5/9/03- bloom
5/18/03- petal fall

Primary apple scab infection periods:
4/22/03 - 26 hours at 45 degrees
4/26/03 - 30 hours at 47 degrees
4/29/03 - for areas that received late afternoon showers
5/1/03 - 29 hours at 57 degrees
5/6/03 - 29 hours at 51 degrees
5/8/03 -
5/12/03 - probable infection period, really wet all day
5/21/03 - 5/24/03 - infection period at least 80 hours long at 52 degrees
5/26/01 - 24 hours at 51 degrees
This was probably the last primary apple scab infection period of the season. Shorter wetting periods are required to cause secondary apple scab infection periods.