This is the second year that the tea roses and the Knock-out both have had puckered new leaves with light spots as if aphids were feeding but we can't find any bugs. The few buds we get look deformed and seldom bloom. We used a systemic rose care in the spring , and since a fungicide and bug killer to no effect. Can anyone help?
Since this is the second year you have had the problem with your roses, it might be a cultural problem such as improper planting, feeding or watering. If you haven't already done so, I advise you to take a soil test. It's easy to do. Your soil's pH may not be favorable for roses. Roses grow best in neutral soil, with a pH of 7.0. They will also tolerate mildly acidic conditions, with a pH as low as 6.0. You can obtain a soil test self mailer from Michigan State here: