Laflin, H.M., Gullan, P.J., & Parrella, M.P. 2004 Mealybug species (Hemiptera: Pseudococcidae) found on ornamental crops in California nursery production.. Proceedings of the Entomological Society of Washington 106(2): 475-477.
Notes: Surveys and collections were carried out between 16 November 2001 and 7 March 2003 in nurseries and greenhouses in California, USA. The mealybug species most frequently found were the long-tailed mealybug, Pseudococcus longispinus and the citrus mealybug, Planococcus citri. With the exception of roses, Planococcus citri fed on many short-term crops such as coleus, whereas Pseudococcus longispinus often fed upon perennial crops such as cycad and Phormium tenax. The lilybulb mealybug, Vryburgia amaryllidis and the obscure mealybug, Pseudococcus viburni, were commonly found as well. V. amaryllidis is limited to a few plant families (especially Liliaceae and Iridaceae). It occurs on the bulb and on the basal portion of the leaves. Pseudococcus viburni was found both on the roots and the aerial portion of the plants, most commonly on short-term crops. Seven other mealybug species were found to occur less frequently. Many of these mealybugs were specialists found only on one species of plant.