Knock-Out Rose Care
My rose leaves hase small holes in them. It starts out looking like scale or small brown spots. I cannot see anything on the underside. I don't know how to treat this. Had last year and it has started already this year. Help
The damage you describe sounds like it could be a form of rose slug, a beetle or perhaps Leaf Hoppers. I would spray the rosesbushes down with a good insecticide. Such as Safer Bug Patrol which should help you gain control. Some tough customers require the use of a systemic insecticide, but I would give the Safer product a try first.
Not sure what you have, but, would caution you to watch for rust on the leaves. My problem with my Knockouts started the same way and in just a few days time I had rust all over the leaves. It is very noticible on the underside of the leave. I have treated mine with a fungicide but will have to severely cut them back and hope for the best. If you live anywhere near a garden center (not a big box store) take them a sample.