I moved into my house last August. No one has lived here for 10 years, so I know there has been no vegetable garden planted anywhere on the property for a very long time, if ever. The first of March, I planted 25 red pontiac seed potatoes. We had a cool snap, and it has been between 65 and 70 degrees, and very damp with lots of rain the last three weeks. My potato plants were fine Saturday morning, and then, the next afternoon, I went out to water, and 2 of my potato plants (they are neighbors) have these spots on the leaves. They are not holes... just spots. Please tell me this isn't early blight. What is this???