Elm trees ( Ulmus sp.) occurring naturally or planted as ornamentals in Europe are susceptible to powdery mildew (PM). In the past, the causal agent of the powdery mildew symptoms on the adaxial side of leaves of Ulmus trees was Erysiphe ulmi in Hungary. However, we identified E. kenjiana on Ulmus pumila leaves sampled from the urban area of Budapest. Identification was based on morphological characteristics and molecular phyl...

Fraxinus ornus and F . excelsior are naturally occurring woodland trees and widely cultivated ornamental plants in Hungary. Leaves with powdery mildew symptoms observed unusually on adaxial side of leaves of F . ornus and F . excelsior were collected from two locations in Hungary. We identified the causing fungi based on their morphological characteristics and molecular phylogenetic analysis. Numerous chasmothecia were found o...

In this study, we investigated two unidentified lineages of root-colonizing fungi belonging to the order Pleosporales (Dothideomycetes), which were isolated from Festuca vaginata ( Poaceae ), a dominant grass species in the semiarid sandy grasslands of Hungary. For molecular phylogenetic studies, seven loci (internal transcribed spacer, partial large subunit and small subunit region of nrRNA, partial transcription elongation f...

Understanding the mechanisms responsible for divergence and specialization of pathogens on different hosts is of fundamental importance, especially in the context of the emergence of new diseases via host shifts. Temporal isolation has been reported in a few plants and parasites, but is probably one of the least studied speciation processes. We studied whether temporal isolation could be responsible for the maintenance of gene...