A new section for Alternaria helianthiinficiens found on sunflower and new asteraceous hosts in Russia
2022
Gannibal, Philipp B. | Orina, Aleksandra S. | Gasich, Elena L.
Alternaria helianthiinficiens previously has been found as a pathogen of sunflower and cosmos in northern hemisphere. This fungus comprises a monotypic lineage which obviously is a separate group that has not been formally described as a section. Information about morphology, distribution, and pathogenic characters of this species is very limited. During this study, two taxonomic novelties were entered. A new section, A. sect. Helianthiinficientes, was described. Alternaria simmonsii was acknowledged to be a synonym of A. helianthiinficiens. The present work allowed definition of Arctium sp. and Sonchus sp. (both are family Asteraceae) as new hosts for A. helianthiinficiens. Isolates of this plant pathogenic fungus were obtained from several new places in the Southern European part of Russia. Six strains were tested on nine asteraceous plants and supported pathogenicity of all strains and susceptibility of all hosts. All strains were more aggressive for Helianthus annuus and Xanthium sibiricum than for other plants regardless on host from which they were isolated. Moderate aggressiveness was detected for Cirsium arvense and H. tuberosus while expansion of lesions on Arctium tomentosum, Artemisia vulgaris, Sonchus arvensis, Tanacetum vulgare, and Taraxacum officinale was sufficiently slower.
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