Pettey, F.W. 1950 The cochineal (Dactylopius opuntiae), and the problem of its control in spineless cactus plantations. Part I. Its history, distribution, biology and what it has accomplished in the control of prickly pear in South Africa.. Entomology Series, Department of Agriculture, Union of South Africa 26: 1-12.

Notes: [Also part of Bulletin No. 296.] Previously imported from Australia to improve control of Opuntia megacantha; discussion of progress; predators include Cryptolaemus montrouzieri and Exochomus flavipes; fungus Empusa lecanii also hinders its spread.