It is very important to go out and scout your fields for late blight. Late blight lesions are large, about the size of a half-dollar. In the morning, before the humidity drops, you will see a ring of white spores around the lesion. Lesion color is dark gray to black. Sometimes, if protective fungicide sprays have been applied previously, you will not see the lesions on the leaf but late blight spores can germinate at the axle of the leaf to the stem, turning the stem black for an inch above and below the axle.
Check fields regularly, especially in poorly drained areas where high humidity hangs on.
If the weather continues to be wet, do a good job scouting your fields. If you have not sprayed with the appropriate Bt, or hand picked them, or sprayed something else for the leaf hopper, then you are probably seeing lots of damage from the larvae and they are getting large. If this is a problem for you, then you will have to turn to rotenone or pyrethrum. This critter seems to becoming more common in Maine. I have received a report from a grower that the Bt for potato beetle actually kills the adults of this beetle.