FUNGICIDAL EFFECT OF TEAK (TECTONA GRANDIS L.) LEAF EXTRACTS ON FUSARIUM OXYSPORUM
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Date
2023-12
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West University of Timisoara, series of Biology.
Abstract
Fusarium oxysporum f. sp. lycopersici is the pathogen of tomato wilt, a disease of great
economic importance worldwide. Although application of synthetic fungicides such as
thiophanate methyl and mancozeb can prevent the occurrence of this disease, their
effects on the physical environment especially, is a limiting factor. Botanicals, i.e. plantbased fungicides are now being preffered for controlling fungal pathogens because they
have minimal environmental impact and are less dangerous to consumers in contrast to
synthetic fungicides. Teak leaves have been reported to possess a very great
antimicrobial activity because of their high content of phytochemicals. In an effort to
develop eco-friendly chemical strategy for control of Fusarium wilt disease of tomato
plants, in vitro effect of 10, 30 and 50% (w/v) concentrations of the aqueous and
ethanolic leaf extracts of teak (Tectona grandis L.) on the radial growth of the mycelia
of Fusarium oxysporum f. sp. lycopersici was investigated using the pour plate method.
Results of the study revealed that both extracts retarded the radial growth of mycelia of
F. oxysporum f. sp. lycopersici compared to that of the control, with the ethanolic extract
having a greater effect at the concentrations tested in this study. It is therefore
recommended that an in vivo study of effects of the same leaf extracts on wilt – infected
tomato plants be conducted
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Citation
Olahan et al. (2023)