I don't remember if I had watered before I applied the fertilizer or not. It was a while ago, probably early summer, trying to get the plants to bloom again before the heat of summer, which didn't work. Drought stress certainly is possible. I water for an hour once a week with a soaker hose which seems like a lot, but I know nothing about how much water roses need. The soil is clay.
The rose had not been sprayed with anything. What you are seeing is just part of the dead foliage. It isn't raised like a blister. It doesn't rub off. It feels like part if the leaf. It is only on the top surface of the leaves. It isn't a hard water mark. I water at the base with a soaker hose.
