Garlic (Allium sativum) is a species in the onion family. Its close relatives include the onion, shallot, leek, chive, and Chinese onion. All are useful companions to roses. They eliminate aphids and beetles by confusing them with their strong scent. They also help roses combat mold and "black spot." Two herbs deter aphids best-- Parsley and Thyme. Strongly scented geraniums also repel Japanese beetles and aphids quite well. Trim rose branches and leaves that have been eaten as soon as you notice them, as they use up vital energy to help other branches grow. I have never had to hand pick bugs off my roses, using this process. For this purpose, the garlic should not be purchased from a grocery store; you need to buy the variety sold at a gardening center and plant it as follows:
Separate cloves. Space the cloves 4-6" apart. Rows should be spaced one foot apart. The cloves should be planted with the pointed end up and the blunt end down. Push each clove 1-2" into the ground, firm the soil around it, and water the bed if it is dry.
In sum, there is no need to spray heavy chemicals on roses, potentially impacting your pet's health and your own, to keep roses healthy in South Carolina. Protect my namesake an BE ITALIAN. Use garlic instead!