Original scientific paper
https://doi.org/10.33765/thate.16.3.3
Published in: Holistic Approach Environ. 16(2026) 3, pp. 122 – 133
Paper reference number: HAE-2574
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THE EFFECT OF CANADIAN GOLDENROD (Solidago canadensis L.) AQUEOUS EXTRACT ON THE GROWTH OF PHYTOPATHOGENIC FUNGI

Tamara Siber^*, Marija Ravlić^*, Marta Doboš^*, Jasenka Ćosić^*, Renata Baličević^*, Ankica Sarajlić^*, Karolina Vrandečić^*

^* Josip Juraj Strossmayer University of Osijek, Faculty of Agrobiotechnical Sciences Osijek, Osijek, Croatia

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ABSTRACT

The phytopathogenic fungi Sclerotinia sclerotiorum and Botrytis cinerea pose a significant problem in global agriculture, as they cause substantial yield losses and economic damage. Their threat arises from a broad host range, the ability to survive in soil for long periods, and the emergence of new strains with increased resistance to fungicides. They are most commonly controlled through the application of chemical fungicides; however, their use is associated with negative environmental impacts, the development of resistance, and potential risks to human health. This study aimed to evaluate the antifungal activity of aqueous extracts from leaves and flowers of Canadian goldenrod (Solidago canadensis L.) against the growth of these fungi. In vitro tests were conducted at concentrations of 75 and 150 mg/mL, and the effectiveness of the extracts was compared with that of commercial fungicides. The highest growth inhibition was observed with the flower extract at the higher concentration (150 mg/mL). In S. sclerotiorum, the leaf extract (150 mg/mL) significantly reduced sclerotia formation (91 %). In B. cinerea, no sclerotia were formed during the observation period; however, the flower extract (150 mg/mL) was the most effective in inhibiting mycelial growth. The results confirm the antifungal potential of S. canadensis extracts in inhibiting mycelial growth and sclerotia formation in S. sclerotiorum. However, their effectiveness is still considerably weaker compared to commercial fungicides, suggesting that, for now, they can primarily be considered a supplementary measure or a basis for further development of more effective bioformulations.

Keywords: plant extracts, S. sclerotiorum, B. cinerea, antifungal activity, inhibition
This work is licensed under a Creative Commons Attribution 4.0 International License.
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