Impact of some fungicides on growth and development of morphological structures of Seimatosporium hypericinum (Ces.) Sutton in vitro



The object of the research work was an isolate of S. hypericinum D 1224, as well as ten fungicides belonging to different chemical groups. The studies on the toxic effect were conducted in vitro by means of poisoning the media with the use of 1, 10 and 100 ěg a.i./cm3 of the tested preparations. The obtained results showed that the compounds of thiophanatemethyl and triadimephon caused complete inhibition of the growth of S. hypericinum, when the dose of 10 and 100 ěg a.i./cm3 was used, while in the case of mancozeb the effective dose was 100ěg a.i./cm3. These compounds, as well as trifloxystrobin, can be therefore regarded as a prospective means of limiting growth and development of S. hypericinum and protecting St. John’s wort from this pathogen. The effect of the other compounds on S. hypericinum was less toxic.
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