Kovács I. Endre szerk.: Rovartani Közlemények (Folia Entomologica Hungarica 10/13-30. Budapest, 1957)

ROVARTANI KÖZLEMÉNYEK FOLIA ENTOMOLOGICA HUNGARICA (SERIES NOVAi 1957. TOM. X. Nr. 17. Occurence of the Nosema bombycis Neegeli among wild Lépidoptère by M. L. Machay Phylaxia State Serum Institute, Budapest The protozoon Ho

sema bombyoie Naegeli is the causative agent of the dangerous disease called „pebrine" of the silkworm. As the parasite is transmitted from one generation to the next through the egg parente used for silkworm seed Produktion are examined carefully and all the eggs originating from diseased moths are excluded from reproduction. In spite of this great numbers of larvae reared after' healthy parents sucoumbe yearly to this illness even though care has been taken to prevent infection through the equipment used in the sericultures, and the larvae are kept under most favourable conditions. It seems therefore probable that some leaves fed to the silkworms are contaminated with the spores of the microsporia and the pathogen originates from free living Lepidoptera. During several yeara /1953-1957/ a number of related Lepidoptera speclea were collected, therefore, in the vieinity of silkworm breeding areas and microacopioally examined. The spores found in these speoies were administered to silkworms and the following disease observed. The results are shown in Table 1. and 2. A few speoies of more or less related Lepidoptera were infected further in laboratory with Hoaema bombycis Naegeli spores isolated from diseased silkworms and the evolution of the disease observed. The result is shown in Table 2. As the results show the Nosema bombycis Naegeli is a