Ophiostomatoid fungi isolated from three different pine species in Argentinian Patagonia

DEERRASTI ANDRÉS; PILDAIN MARÍA BELÉN; RAJCHENBERG MARIO

FOREST PATHOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2018 vol. 48 p. 1 - 11

1437-4781

Pine plantations in Argentinian Patagonia cover ca. 95,000 ha in Chubut, Río Negroand Neuquén provinces. Exotic bark beetles (Orthotomicus laricis, Hylastes ater andHylurgus ligniperda) commonly occur in freshly cut logs, stumps and slash. These bee-tles are vectors of ?ophiostomatoid? fungi which include primary tree pathogens aswell as important agents of blue stain. The aim of this study was to identify thesebeetle- associated fungi. Sawing mills and pine plantations were surveyed three con-secutive years. Fungal isolates from stained logs, processed wood and insect gallerieswere identified based on morphological and DNA sequence comparisons of ITS andβ-tubulin gene regions. Two Grosmannia, one Graphilbum and three Ophiostoma spe-cies were identified. Ophiostoma piliferum and O. peregrinum sp. nov. were the mostfrequently isolated taxa. O. peregrinum occurred in all provinces, colonizing differentconifer species and, interestingly, also the native broadleaved species Nothofagusdombeyi. Pine plantation forestry in southern South America includes Argentina, Brazil,Chile, Paraguay and Uruguay. Emerging data from Argentina, Chile and Uruguay re-vealed some coincidences between these countries, but also several differences, prob-ably, as a result of multiple introduction events.