Willow rust fungus (Melampsora ari-salicina(?) on a female catkin of goat willow in Sestroretsk near Saint Petersburg. Russia, May 30, 2019Common name: willow rust.
Russian name: pyatnistost listev ivy.
Melampsora ari-salicina is a species of rust fungus that infects willows (Salix spp.) and arabis (Arabis spp.). In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found to be widely distributed, with frequent occurrences on Salix fragilis, Salix alba, and Salix pentandra. The fungus causes yellow or orange spore masses on the underside of leaves, leading to defoliation and reduced plant growth. It overwinters as teliospores on willow stems, with urediniospores and aecidiospores produced in spring and summer.
Willow rust fungus (Melampsora ari-salicina(?) on a female catkin of goat willow in Sestroretsk near Saint Petersburg. Russia, May 30, 2019The observation of Melampsora ari-salicina in Leningrad Oblast and north-western Russia revealed its presence on a female catkin of goat willow in Sestroretsk near Saint Petersburg. The fungus was found on May 30, 2019, indicating its activity during late spring. The specific host plant, goat willow, suggests that the fungus has a specialized relationship with this species. The location of the observation, Sestroretsk, is significant as it provides information on the geographical distribution of the fungus in north-western Russia. Further observations are necessary to determine the extent of its spread and its impact on the local ecosystem. The presence of Melampsora ari-salicina in this region highlights the importance of continued monitoring of fungal populations to understand their ecology and potential effects on plant communities. This data contributes to a broader understanding of the fungus's distribution and behavior.
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