Dear All: Please find below a message from Dr. Srdjan Acimovic.
In any apple trees blocks still at bloom, fire blight infection will be possible if weather forecast from NWS changes from what is now used to run EIP NEWA fire blight model: i.e. if dew or rain occurs. The currently orange labeled EIP cells with values above 100 could turn to Red color and word Infection if dew or rain occurs (attached), keep looking at model every day. Some locations (airports) I attached show that red cell change to Infection due to wetting. If this change occurs, apply 1.5 lbs/A Harbour or Agri-Mycin plus Regulaid 1 pt/100 gal, before rain/dew triggering infection or up to 24 h after that rain, on any apple or pear trees in bloom.