Apple scab is present in a number of orchards around the state.
If you do have scab, it is important to try to determine why. The May 18th Vermont Apple IPM Alert included a table with the number of days required for lesions to develop based on average daily temperatures. If you don't know exactly when the lesions first appeared, you should note where the oldest lesions are located. Answers to these questions will indicate when infection took place. If you can determine the likely infection period from which the lesions originated, then it is on to your spray records.