It's on two of my four plants and I don't know what to do. please help. I don't know what this is and can't find pics like it online.
Here is a link that might be useful: Zucchini leaf
sorry link was bad.. this is it.
Here is a link that might be useful:
That looks more like a disease of some sort, not insect damage. I don't see any fuzzy mold growth so it's prob not powdery mildew.