Mathys, G., & Guignard, E. 1961 L'efficacité e Prospaltella perniciosi Tow., parasite du pou de San-José Quadraspidiotus perniciosus Comst.): Essai de conciliation de la lutte biologique et de la lutte chimique en vergers exploités commercialement.. Revue Romande d'agriculture, de viticulture et d'arboriculture 17(6): 53-56.

Notes: Title in English: [The efficiency of Prospaltella perniciosi Tow., parasite of the San José scale (Quadraspidiotus perniciosus comst.): an attempt at conciliaton of biological control and chemical control in commercial orchards.] Some background on the San Jose scale, the role of biological control and its several phases, and chemical control are discussed in this paper.