Mealybugs are key pests in nurseries producing ornamental plants. Conventional mealybug monitoring practices consist of random, visual sampling of plant material. However, mealybugs are cryptic, and many remain undiscovered during visual sampling. Therefore, it is difficult to determine the presence of mealybugs or their population density with this tactic. A potential alternative monitoring technique would use sticky traps baited with mealybug sex pheromones to attract adult males. Results of studies that examine basic parameters of these traps, including an effective pheromone dose and longevity, will be presented. In addition, there are three mealybug species of economic importance found in nurseries in California: citrus, obscure, and longtailed mealybugs. Trap catches with a combination lure containing the sex pheromone of all three species were compared to trap catches in traps baited with each pheromone individually.