Azaleas attract a sucking insect called lacebug, especially in full sun locations. Most juniper varieties are attractive to spider mites. Pittosporum and ligustrum, especially in heavily shaded or poorly drained locations or areas where air circulation is lacking, are subject to leaf spot diseases and root rots. Hibiscus and gardenias can attract whiteflies and aphids. Magnolias are hosts to their own type of scale insect.
Roses attract aphids and black spot disease.