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Notes: [This paper was presented at the International Conference on Integrated Fruit Production (Polesny, Muller & Olszak, Eds.) held at Cedzyna, Poland, 28 August - 2 September 1995.] Up to 1978 a programme for biological control of Quadraspidiotus perniciosus with mass reared Prospaltella perniciosi was carried out. In the present situation all investigated Q. perniciosus populations showed acceptable parasitization rates (from 11% up to 63%, mean 30%). On many sites the endemic endoparasitic wasp Aphytis sp. has a higher importance than Prospaltella.