Dr. Murai Éva szerk.: Parasitologia Hungarica 19. (Budapest, 1986)

rant. They were rod-like, C-shaped, elongated or smaller than the normal ones. Similar pupae could be seen when the larvae of Musca dornestica were exposed to sublethal dosages of Larvadex. These m orphogenetic effects were not observed in larvae and pupae of Fanni a femoralis, because larvae of this species do not contract before normal pupation (HALL and FOEHSE, 1980; MULLA and AXELROD, 1983). The aberrant pupal forms, which are often called "larva-pupa intermediates", are associated with ICRs (HALL et al. , 1979). At higher concentrations (1 and 2 ppm) the development of adults from pupae was completely prevented. At lower concentrations (0.5 and 0.1 ppm) some eclosions could be observed. At the level of 0.5 ppm there were 13 eclosions, 2 of these were incomplete and the adults died during the eclosion. At the lowest concentration 97 of the 100 treated larvae were able to pupate, but 56 of them did not produce adults. In 16 cases the imagos died at different stages of eclosion. In most cases only the head or the head and the thorax emerged from the pupal shell. Similar effects produced by ICRs have been reported in Musca dornestica (AWAD and MULLA, 1984) and Sto- moxys calcitrans (WRIGHT and SPATES, 1971). The imagos wholly eclosed from two pupae but they were still attached to the puparium by their legs or wings. It can be established that cyromazine is effective against previously not tested Musca osiris. Parallel to an increase of drug concentration the effect became more pronounced. Similar results have been reported in Musca dornestica (AWAD and MULLA, 1984). These authors found that at higher concentrations (l and 1. 5 ppm) eclosion was incomplete and at the level of 0. 5 ppm only 54 per cent of treated Musca dornestica larvae developed into deformed puparia or adults. Comparing our data to those in the literature it seems likely that Musca osiris is more sensitive to cyromazine than Musca dornestica. FARKAS, R.: A cyromazine (IGR) hatása a Musca osiris Wiedemann, 1830 (Diptera: Muscidae) harmadik stádiumú lárváira Laboratóriumi vizsgálatai során a szerző arra kereste a választ, hogy a rovarnövekedés-szabályozók csoportjába tartozó ciromazin 0.1, 0.5, 1 és 2 ppm koncentrációi befolyásoljáke a Musca osiris korai 3. stádiumú lárváinak továbbfejlődését. A vizsgálatok eredményei azt mutatják, hogy mindegyik koncentráció esetén a lárvák képesek voltak továbbfejlődni és bebábozódni, de a kialakult bábok többsége deformált volt. A két legmagasabb koncentráció esetén 100 %-os bábmortalitás mutatkozott. A ciromazin adagjának csökkenésével nőtt az életképes, illetve a kelés különböző stádiumában elpusztult imágók száma. REFERENCES AWAD, T. I. - MULLA, M.S. (1984): Morphogenetic and histopathological effects induced by the insect growth regulator cyromazine in Musca dornestica (Diptera: Muscidae). - J. econ. Ent., 21: 419-426. CHAMBERLAIN, W. F. (1975): Insect growth regulating agents for control of arthropods of medical and veterinary importance. - J. med. Ent., 12: 395-400. 7 9