In observations in Hungary in 1973, 100 groups of 100 shoots of apple, pear and medlar with curled twisted leaves containing Lepidopterous larvae were collected at seven places. The adult moths and the parasites reared from them are listed, and their numbers are analysed according to zoocoenological concepts described earlier by G. Szelenyi. Corrumpent elements (populations that thrive on living plants and exploit the food supply presented by them), obstant elements (populations that live on other animal populations, reducing their density) and grade of obstancy (a percentage value by which the density of a corrumpent population decreases by the action of obstant elements) are listed. The corrumpent and (in brackets) obstant elements on apple included Blastodacna atra (Haw.) (parasitised by Copidosoma coleophorae Mayr and Entedon sp.), Recurvaria leucatella (Cl.) (parasitised by Apanteles longicauda (Wesm.) and Ascogaster annularis (Nees)), Hedya nubiferana (Haw.) (parasitised by Macrocentrus pallipes ( Nees)) and Spilonota ocellana (Schiff.) (parasitised by Agathis (Microdus) cingulipes (Nees)). Those on pear included R. leucatella, R. nanella (Hb.) and S. ocellana and those on medlar Pandemis heparana (Schiff.) and S. ocellana. none