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Articles containing the keyword 'pathogenicity'

Category : Research article

article id 10764, category Research article
Sabiha Acer, Zeynel Arslangündoğdu, Asko Lehtijärvi. (2023). The occurrence and pathogenicity of fungi associated with Orthotomicus erosus on Pinus brutia in the Southern Marmara, Türkiye. Silva Fennica vol. 57 no. 2 article id 10764. https://doi.org/10.14214/sf.10764
Keywords: Ophiostoma; pathogenicity; Graphilbum; Leptographium; Mediterranean pine beetle; Turkish pine; Southern Marmara
Highlights: Three ophiostomatoid fungi species are recorded, associated with Orthotomicus erosus on Pinus brutia for the first time in Türkiye; Ceratocystis ips has the highest frequency. The association between Leptographium wingfieldiiand Orthotomicus erosus occurred with high frequency; While all three fungal species are severely pathogenic for pines in some regions, they are weak pathogens for Turkish pine in Türkiye.
Abstract | Full text in HTML | Full text in PDF | Author Info

Fungal pathogens associated with bark beetles constitute one of the most significant problems to forest health. The Turkish pine (Pinus brutia Ten.) is a native species in the forests of Türkiye and occurs in the Mediterranean-type climate. The Southern Marmara is a natural occurrence area of Turkish pine in the Marmara Region. In the present study, trap logs were set up in pure Pinus brutia forests to investigate fungi associated with Orthotomicus erosus (Wollaston) (Mediterranean pine beetle) throughout Southern Marmara. Orthotomicus erosus adults, larvae, and their galleries were sampled and individually cultured on a 1% CSMA (cycloheximide–streptomycin malt agar) medium. Three ophiostomatoid fungi were identified using morphological characteristics and molecular genetic analyses: Ceratocystis (syn. Ophiostoma) ips (Rumbold) C. Moreau, Graphilbum sp. H.P. Upadhyay & W.B. Kendr., and Leptographium wingfieldii M. Morelet. All three species were new in records of the fungal flora of Türkiye. The most dominant of these species, Ceratocystis ips was isolated 69%. Unexpectedly, L. wingfieldii had a high-frequency association with O. erosus (27%). The pathogenicity tests showed that all three species could cause lesions on branches of Turkish pine but were non-pathogenic or weak pathogenic.

  • Acer, Istanbul University-Cerrahpaşa, Department of Forest Entomology and Protection, Faculty of Forestry, 34473, Istanbul, Türkiye E-mail: sacer@iuc.edu.tr (email)
  • Arslangündoğdu, Istanbul University-Cerrahpaşa, Department of Forest Entomology and Protection, Faculty of Forestry, 34473, Istanbul, Türkiye E-mail: zeynel@iuc.edu.tr
  • Lehtijärvi, Isparta University of Applied Sciences, Sütçüler Prof. Dr. Hasan Gürbüz Vocational School, 32950, Isparta, Türkiye E-mail: askolehtijarvi@isparta.edu.tr
article id 1328, category Research article
Nelly N. Selochnik, Nataliya V. Pashenova, Evgeny Sidorov, Michael J. Wingfield, Riikka Linnakoski. (2015). Ophiostomatoid fungi and their roles in Quercus robur die-back in Tellermann forest, Russia. Silva Fennica vol. 49 no. 5 article id 1328. https://doi.org/10.14214/sf.1328
Keywords: Ophiostomatales; Ophiostoma; oak die-back; pathogenicity
Highlights: Dominant ophiostomatoid fungi associated with Q. robur in the post-outbreak region of oak die-back were investigated; Ophiostoma quercus was the most commonly encountered fungus; This is the first report of O. grandicarpum from Russia; The results of preliminary pathogenicity experiments demonstrate that fungi investigated in this study are unlikely to play causal role in oak die-back
Abstract | Full text in HTML | Full text in PDF | Author Info

Several eastern European countries have reported outbreaks of oak die-back during the 1980’s. Species of Ophiostoma Syd. were isolated from diseased trees and have been suggested to be the possible causal agents of the die-back, but this view have generally not been accepted. In order to monitor the post-outbreak region of oak die-back and to consider the possible role of Ophiostoma spp. in the syndrome, research has been conducted in the Tellerman forest, Voronezh region, Russia between 2005 and 2011. Our study resulted in the isolation of ophiostomatoid fungi from Quercus robur L. trees displaying external signs of desiccation. Fungi were identified based on morphological characteristics and DNA sequence comparisons. Three species of Ophiostoma were identified including O. grandicarpum (Kowalski & Butin) Rulamort, a species closely related to O. abietinum Marm. & Butin, O. fusiforme Aghayeva & M.J. Wingf. and O. lunatum Aghayeva & M.J. Wingf. representing a poorly understood species complex, and most commonly O. quercus (Georgev.) Nannf. Pathogenicity of these fungi was tested using artificial inoculations on Q. robur trees. The fungi were shown to be non-pathogenic and unlikely to play any role in oak die-back. These fungi are most likely only components in a complex of abiotic, biotic and anthropogenic factors that have contributed to a die-back of Quercus spp. in Russia.

  • Selochnik, Forest Science Institute of RAS, Uspenskoe 143030, Moscow Region, Russia E-mail: lenelse@yandex.ru
  • Pashenova, V.N. Sukachev Institute of Forest SB RAS, Krasnoyarsk 660036, Russia E-mail: pasnat@ksc.krasn.ru
  • Sidorov, Department of Forest Protection and Game Management, St. Petersburg State Forest Technical University, St. Petersburg 194021, Russia E-mail: sidorov_evgeny@mail.ru
  • Wingfield, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, 0002 Pretoria, South Africa E-mail: mike.wingfield@up.ac.za
  • Linnakoski, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, 0002 Pretoria, South Africa; Department of Forest Sciences, University of Helsinki, P.O. Box 27, FI-00014 University of Helsinki, Finland ORCID http://orcid.org/0000-0002-3294-8088 E-mail: riikka.linnakoski@helsinki.fi (email)

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