Abstract
Beetles from Curculionidae and Attelabidae collected from 14 localities (mainly in coniferous stands) in Bulgaria were investigated for the presence of pathogens and nematodes. A microsporidium belonging to genus Nosema in the fat body of Pityogenes chalcographus (prevalence: 0.9%) and the fungus Beauveria bassiana in the oak-leaf roller Attelabus nitens (prevalence: 62%) were detected for the first time. Morphological data and characteristics of Nosema sp. spores and conidia of B. bassiana are presented. Nematode species (Cryptaphelenchus diversispicularis, Parasitorhabditis subelongati and Parasitylenchus dispar), and specimens belonging to other ten nematode genera were found (Bovianema, Bursaphelenchus, Cryptaphelenchus, Neoparasitylenchus, Parasitylenchus, Parasitaphelenchus, Panagrolaimus, Parasitorhabditis, Prothallonema and Sulphuretylenchus). Their prevalences varied from 17.4% to 90%. Nine of the host beetles (Dryocoetes autographus, Ips sexdentatus, I. acuminatus, Orthotomicus laricis, O. erosus, Pityogenes quadridens, P. conjunctus, Hylurgus ligniperda and Taphrorychus villifrons) are reported as vectors of Bursaphelenchus sp.
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