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.

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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
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

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