Abstract
<i>Sphaerellopsis filum</i> is a well-known parasite associated with many species of rust fungi. It is of frequent occurrence as parasite of cereal rusts: <i>Puccinia recondita</i>, <i>P. coronata</i>, <i>P. graminis</i>, <i>P. hordei</i> and <i>P. striiformis</i>. Uredial sori of <i>Puccinia recondita</i> f.sp. <i>tritici</i> infected with <i>Sphaerellopsis filum</i> were examined by light and scanning microscope to determine morphology of hyperparasite as well as the parasite-hyperparasite contact. The microscopical examination of infected uredinia clearly showed the intimate connection of <i>S. filum</i> with its rust host.
Highlights
Sphaerellopsis filum (Biv. ex Fr.) B.Sutton [Darluca filum (Biv. ex Fr.) Castagne], anamorph of Eudarluca caricis (Fr.) O
Sphaerellopsis filum is most commonly observed as anamorph producing clumps of shiny, black spherical pycnidia situated among the spores of uredial sori, where it is presumed to derive nutrients from direct hyphal penetration of uredospores
Samples of wheat infected with Puccinia recondita and Sphaerellopsis filum were collected in September 2002 from an experimental field of Department of Plant Pathology in Warsaw
Summary
Sphaerellopsis filum (Biv. ex Fr.) B.Sutton [Darluca filum (Biv. ex Fr.) Castagne], anamorph of Eudarluca caricis (Fr.) O. Erikss., is a cosmopolitan hyperparasite associated with 369 rust species belonging to 30 genera. It has been found in more than 50 countries (Kranz and Brandenburger , 1981). Sphaerellopsis filum is most commonly observed as anamorph producing clumps of shiny, black spherical pycnidia situated among the spores of uredial sori, where it is presumed to derive nutrients from direct hyphal penetration of uredospores. Because of this penetration, the uredospores number is reduced and spore production in some cases completely stopped. Due to this fact the hyperparasite can potentially be an important biocontrolling factor (Yu a n et al, 1998; Kuhlman & Matthews , 1976; Carling et al, 1976; Swendstrud and Calpouzos , 1972)
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