<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The striped ambrosia beetles <italic>Trypodendron lineatum</italic> and <italic>T. domesticum</italic> are timber forest pests in the Palearctic region and North America. Because only a few pathogens are known for <italic>Trypodendron</italic> species, the aim of this work was to determine the spectrum of pathogen species of <italic>T. lineatum</italic>, <italic>T. laeve</italic>, and <italic>T. domesticum</italic>. <italic>Trypodendron</italic> species were collected in pheromone traps at nine localities in the Czech Republic, five localities in Poland, and one locality in Austria. In total, 2,439 <italic>T. lineatum</italic>, 171 <italic>T. domesticum</italic>, and 17 <italic>T. laeve</italic> beetles were dissected and examined. Infection was found in only two of the 17 specimens of <italic>T. laeve</italic> and in only two of the 171 specimens of <italic>T. domesticum</italic>; in all four cases, the parasites were nematodes. Parasitisation of <italic>T. lineatum</italic> by nematodes was found in <italic>T. lineatum</italic> at eight localities with a mean (<underline>±</underline> SE) parasitisation level of 8.1 ± 4.7%. A <italic>Chytridiopsis</italic> sp. was detected in cells of the midgut epithelium of one <italic>T. lineatum</italic> specimen, and <italic>Gregarina</italic> sp. was detected in the midgut lumen of two <italic>T. lineatum</italic> specimens; no other pathogens were found in <italic>T. lineatum</italic>. The low infection rates and the tendency for infection by nematodes can be explained by the monogamy of <italic>Trypodendron</italic> spp. and their feeding on fungi in short galleries that are not connected to the galleries of conspecifics.</p>
</abstract>

The striped ambrosia beetles Trypodendron lineatum and T. domesticum are timber forest pests in the Palearctic region and North America. Because only a few pathogens are known for Trypodendron species, the aim of this work was to determine the spectrum of pathogen species of T. lineatum, T. laeve, and T. domesticum. Trypodendron species were collected in pheromone traps at nine localities in the Czech Republic, five localities in Poland, and one locality in Austria. In total, 2,439 T. lineatum, 171 T. domesticum, and 17 T. laeve beetles were dissected and examined. Infection was found in only two of the 17 specimens of T. laeve and in only two of the 171 specimens of T. domesticum; in all four cases, the parasites were nematodes. Parasitisation of T. lineatum by nematodes was found in T. lineatum at eight localities with a mean (± SE) parasitisation level of 8.1 ± 4.7%. A Chytridiopsis sp. was detected in cells of the midgut epithelium of one T. lineatum specimen, and Gregarina sp. was detected in the midgut lumen of two T. lineatum specimens; no other pathogens were found in T. lineatum. The low infection rates and the tendency for infection by nematodes can be explained by the monogamy of Trypodendron spp. and their feeding on fungi in short galleries that are not connected to the galleries of conspecifics.

Extremely low infection levels of pathogens and nematodes in <italic>Trypodendron</italic> spp. (Coleoptera: Curculionidae)

University of Natural Resources and Applied Life Sciences, Vienna, Institute of Forest Entomology, Forest Pathology and Forest Protection, Gregor-Mendel-Straße 33, 1180 Vienna,

Czech University of Life Sciences, Faculty of Forestry and Wood Sciences, Kamýcká 129, 165 21 Prague 6,

University of Agriculture in Krakow, Faculty of Forestry, Al. 29 Listopada 46, 31 425 Cracow,

Central European Forestry Journal

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Extremely low infection levels of pathogens and nematodes in  spp. (Coleoptera: Curculionidae)

The striped ambrosia beetles Trypodendron lineatum and T. domesticum are timber forest pests in the Palearctic region and North America. Because only a few...

Extremely low infection levels of pathogens and nematodes in Trypodendron spp. (Coleoptera: Curculionidae)

Published Online: Jan 27, 2017

Page range: 202 - 206

DOI: https://doi.org/10.1515/forj-2016-0025

Keywords
spp., nematodes, cf., cf., monogamy

© 2016 Rudolf Wegensteiner et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Extremely low infection levels of pathogens and nematodes in Trypodendron spp. (Coleoptera: Curculionidae)

Published Online: Jan 27, 2017

Page range: 202 - 206

DOI: https://doi.org/10.1515/forj-2016-0025

Keywordsspp., nematodes, cf., cf., monogamy

© 2016 Rudolf Wegensteiner et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
spp., nematodes, cf., cf., monogamy