Common pests that attack Plumeria include aphids, mealybugs, scale insects, spider mites, and whiteflies. Regularly inspect the plant for signs of infestations, such as sticky residues, webs, or discolored leaves. Treat pest issues promptly with horticultural oils, insecticidal soaps, or neem oil. Encourage beneficial insects like ladybugs and lacewings to help control pest populations.