Bénassy, C., & Milaire, H.G. 1958 Lutte biologique contre le pou de San José avec Prospaltella perniciosi Tow. [Biological control of the San José scale by Prospaltella perniciosi Tow.]. Phytoma 99: 7-11.

Notes: The problem of Quadraspidiotus perniciosus Comst. in the U.S. and Europe is discussed.