New findings of rusts (Pucciniales) on trees and other plants in Slovenia.
Rusts (Puccinales) are obligate biotrophs, representing one of the largest groups of plant pathogenic fungi and are one of the most economically important pathogens of many native and cultivated plants. Introduction of alien rusts to new environments can lead to large-scale epiphytotics. Their life cycle is complex, requiring usually more than one host to be completed. The taxonomy and identification of rusts is notoriously difficult, and only the implementation of morphological and molecular data can reveal the correct taxonomic emplacement. From 2014 to 2016 trees and other plants with rust infections were sampled. Identifications of rusts were performed based on morphological characteristics and phylogenetical comparisons to reference ITS-rDNA sequences. First official records of alien rust species Melampsoridium hiratsukanum and Phragmidium mexicanum are reported.