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Varietal Ceratocystis minor identified from mycangium ofDendroctonus frontalis

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Abstract

The mycangium of the adult female southern pine beetle is a prothoracic glandular repository that serves for the propagation, transmission, and dissemination of fungi between and within host conifers. One fungus (SJB 133) was observed as reproducing amerosporous cells in the mycangium, but in larval galleries it developed a sporodochium-like layer of sympodulate conidiophores and conidia. Anascigerous reproduction in the galleries appeared to be stimulated by the presence of beetle larvae. The fungus exhibited many of the characteristics of ambrosial fungi associated with xylomycetophagous scolytids, thus indicating a possible analogous nutritional relationship. Inoculum from both the mycangium and beetle galleries produced an anascigerousSporothrix sp. on various media. After prolonged development on potatoglucose agar the fungus produced aCeratocystis ascigerous form. Virulence and serological studies resulted in the conclusion that the mycangial fungus (SJB 133) is a variety ofCeratocystis minor. A detailed description of the fungus is presented. Significance of the maintenance of theSporothrix form in the mycangium and galleries is discussed.

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Authors and Affiliations

  1. Southern Forest Experiment Station, USDA Forest Service, 71360, Pineville, La.

    John J. Taylor (Principal Entomologist)

  2. University of Montana, 59801, Missoula, Montana

    John J. Taylor (Principal Entomologist)

Authors
  1. Stanley J. Barras
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  2. John J. Taylor
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Coleoptera: Scolytidae

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Barras, S.J., Taylor, J.J. Varietal Ceratocystis minor identified from mycangium ofDendroctonus frontalis . Mycopathologia et Mycologia Applicata 50, 293–305 (1973). https://doi.org/10.1007/BF02050029

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  • DOI: https://doi.org/10.1007/BF02050029

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