In this Master's thesis we studied whether the extracts of the three goldenrod (Solidago) species have antifungal activity. Since the common goldenrod (S. virgaurea) is indigenous, and the other two – Canadian goldenrod (S. canadensis) and giant goldenrod (S. gigantea) are invasive alien species, we tested the differences in antifungal activity according to their origin and used plant material (leafs, inflorescence) and way of preparing extracts (aqueous, organic – 96 % ethanol). Fungi used in the study were: Alternaria alternata, Alternaria infectoria, Aspergillus flavus, Aureobasidium pullulans, Botrytis cynerea, Epicoccum nigrum, Fusarium poae and Penicillium palitans. We selected these species because of their negative effects on plants grown for food. After one week we measured the area of fungal mycelium and calculated the growth percentage according to the control. We found out that inhibition of fungal growth was similar when aqueous and organic extracts were applied. Also leaf extract caused similar effects as inflorescence extracts. According to the sensitivity to the extracts, the fungi followed the order: F. poae being the most sensitive, than E. nigurm, A. alternata, C. botrytis, A. pullulans, A. infectoria and P. palitans as the least sensitive. The differences in efficiency of the extracts of the leaf and inflorescence extracts of three goldenrod species were not significant.
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