Cox, J.M., & Wetton, J.M. 1988 Identification of the mealybug Planococcus halli Ezzat & McConnell (Hemiptera: Pseudococcidae) commonly occurring on yams (Dioscorea spp.) in Africa and the West Indies.. Bulletin of Entomological Research 78: 561-571.
Notes: Multivariate analysis used to demonstrate that specimens of Planococcus collected from yams (Dioscorea spp.) can be differentiated from the similar P. ficus which occurs on figs, grapevines and pomegranates in the Mediterranean Basin, Pakistan, South Africa and Argentina; the differentiation is not a host-induced effect; key and illustrations provided.