Iris borer, verbena bud moth, whiteflies, iris weevil, thrips, aphids, and nematodes. Common North American pests include the potato beetles, flea beetles, aphids, whiteflies, and spider mites. Japanese beetles, whiteflies and aphids are occasional insect visitors. These include aphids, whiteflies and scale insects. Their closest relatives are the jumping plant lice, whiteflies, phylloxera bugs and aphids. These include cicadas, leafhoppers, treehoppers, planthoppers, froghoppers, aphids, whiteflies, scale insects, and some other groups. Mites, whiteflies, and flea beetles can be problematic. Zinnias, conversely, attract predators that consume whiteflies, including hummingbirds and predatory wasps and flies. Spider mites and whiteflies may be a problem. Predators, parasitoids, and pathogens specific to whiteflies can keep populations under control. Cinnamon basil is sometimes planted near tomatoes and roses to discourage pests such as whiteflies. "M. paniculata" is vulnerable to soil nematodes, scales, sooty mold and whiteflies. Whiteflies are Hemipterans that typically feed on the undersides of plant leaves. Further harm is done by mold growth encouraged by the honeydew whiteflies secrete. Insecticides can be costly, and have an increasing risk of resistance by whiteflies.