Several species of this sap-sucking, winged pest exist. You'll find aphids in green, black, yellow or red. They attack edible and ornamental plants, including garden roses, causing stunted growth, curling and yellowing leaves, and a honeydew buildup that leads to black, sooty mold. Honeydew produced by aphids attracts ants as well, so include them in your treatment plan. Read more about controlling aphids.