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Acta Parasitologica, Vol.47, No. 1, 2002, 1-5
Pilarska Daniela (1), Linde Andreas (2), Solter Leellen F. (3), Takov Danail (1), McManus Michael L., Goertz Dorte (2) - Ultrastructural characteristic of a Nosema sp. (Microsporidia) from the Bulgarian population of Euproctis chrysorrhoea L. (Lepidoptera).

(1) Institute of Zoology, Bulgarian Academy of Sciences, 1, Tsar Osvoboditel Blvd., 1000 Sofia, Bulgaria; (2) Department of Forestry, University of Applied Sciences, A. Moller Str. 1, 16225 Eberswalde, Germany; (3) Illinois Natural History Survey, Center for Economic Entomology, 607 E. Peabody Drive, Champaign, IL 61820, USA; (4) USDA Forest Service, Northeastern Forest Experimental Station, 51 Mill Pond Road, Hamden, CT 06514, USA

Ultrastructure and development of a microsporidium isolated from a natural Euproctis chrysorrhoea larval population in Western Bulgaria were studied. Mature environmentally resistant spores of this microsporidium possess typical diplokarya, 9-10 polar filament coils, smooth polaroplasts and wavy exospores; we consider it to be a Nosema species. Nosema sp. occurred in the fat body and silk glands of E. chrysorrhoea and caused hypertrophy of the silk gland cells. This species is not infective to closely related Lymantria dispar. This Nosema isolate does not appear to be one of the species previously described from E. chrysorrhoea.

KEY WORDS: Nosema sp., microsporidia, ultrastructure, development, Euproctis chrysorrhoea
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