Rudolf Wegensteiner

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Four different pathogen species (Gregarina typographi, Chytridiopsis typographi, Unikaryon montanum and Menzbieria chalcographi) were found in adult Ips typographus from the Forest Demonstration Centre, BOKU University in the course of a 7-year period of investigation (1995–2001). Annual variations were found in both the spectrum and prevalence of pathogen(More)
The ascomycete fungusMetschnikowia typographi sp.nov. is described. It infects the spruce bark beetlesIps typographus L. andIps amitinus Eichl. Masses of vegetative cells and navicular asci (I. typographus 13–17 × 2 µm;I. amitinus 17–22 × 2 µm) were found in cells of the midgut epithelium and in the body cavity of infected beetles. Each ascus contains two(More)
Pathogen occurrence was studied in 16 099 adult specimens of 10 different bark beetle species, which live associated on Norway spruce (Picea abies (L.) Karst.). Beetles (mainly Ips typographus L. and Pityogenes chalcographus L.) were collected from 6 different localities in Austria (4 secondary spruce stands and 2 natural forest type stands, 9 sampling(More)
The occurrence, species diversity and some aspects of taxonomical affinity and host selectivity of acaropathogenic fungi associated with phytophagous, saprotrophic and predacious mites in Poland and other European countries were investigated on wild and cultivated plants, in insect feeding sites under the bark and in decayed wood. From among 33 species of(More)
The aim of this research was to identify pathogens in field populations of the genus Pityokteines from Croatia with special reference to their spatial distribution throughout the country. Pathogens occurrence was studied in 5,968 adult specimens of three silver fir bark beetle species: Pityokteines curvidens, P. spinidens and P. vorontzovi. Four pathogen(More)
The Western Corn Rootworm D. virgifera virgifera Le Conte (Coleoptera: Chrysomelidae), a serious pest of maize, has been recently introduced into Europe. Several approaches for its control are presently under investigation including microbial agents. In order to get information on the role of naturally occurring pathogens in the regulation of Diabrotica(More)
Canningia tomici sp. n. (Microsporidia, Unikaryonidae) infects the midgut epithelium, the gut muscules, Malpighian tubules, connective tissues, adipose tissues and the gonads of the pine shoot beetle, Tomicus piniperda (L.) (Coleoptera, Scolytidae). The infection is present in populations of Tomicus piniperda in Europe and in the United States. Uninucleate(More)
The study presents new data on spatial distribution of bark beetle pathogens, on changes in frequency over several years and on their prevalence during different time periods within a year from several locations within the wilderness reserve Dürrenstein (Lower Austria). The occurrence of pathogens was investigated in Ips typographus (during five years), in(More)
A new microsporidium is reported from the small spruce bark beetle, Ips amitinus: Microsporidium sp. with uninucleate oval spores measuring 3.5 × 2.5 μm; infecting cells of the midgut epithelium, midgut muscles, the fat body, the Malpighian tubules, and the gonads of adult beetles collected in Austria. Seven other pathogens were found in beetles collected(More)
Ips sexdentatus (six-spined engraver beetle) from Austria and Poland were dissected and examined for the presence of pathogens. Specimens collected in Austria were found to contain the ascomycetous fungus Metschnikowia cf. typographi. Infection rates ranged from 3.6% to 26.8% at different collection sites. M. cf. typographi infected midguts were(More)