Biotic effect of caraway phyllosphere fungi on the pathogenic fungus Septoria carvi Syd.
Abstract
The study material consisted of K 1860 Septoria carvi isolate and single isolates of 18
other fungal species, chosen randomly from our own collection created during the studies
of caraway diseases carried out in 2001-2006. Individual, general and summary biotic
effects of the various fungi on Septoria carvi were determined by using the biotic series
method and PDA (Difco) medium. Our results show that S. carvi is a weak competitor,
because its growth was limited by all studied species of fungi representing the phyllosphere
of caraway. Trichoderma, Gliocladium and Epicoccum purpurascens were recognized
as positive and effective antagonistic fungi in relation to S. carvi. Moreover, the studied
fungi that are pathogens of caraway and other plants, i.e. Fusarium spp., Rhizoctonia
solani, Colletotrichum spp., Botrytis cinerea, Alternaria spp. and Phoma exigua proved
strongly competitive to S. carvi, so these fungi could mask the symptoms of septoriosis
at the first stage of the disease.