The present paper describes the antifungal
activity of some plant extracts on the development of
Fusarium oxysporum f.sp. lycopersici. The best extracts
were selected to be tested as a phytofungicide to control
crop diseases, with the ultimate goal of developing a
green alternative to synthetic fungicides. Using the
conidia germination assay, of the 24 plant extracts
tested, 15 reduced conidia germination and 6 completely
inhibited germination. Extracts of Rivina humulis,
Brassica carinata, Brunfelsia calyicina, Salvia guaranitica
and Punica granatum showed good antifungal activity.
The relationship between total phenolic content (TPC) in
each plant extract tested and the percentage of mycelial
growth inhibition showed a significant correlation (R2
= 0.69), while no correlation was found between total
flavonoid content (TFC) and percentage mycelial growth
inhibition. Among all extracts tested, Punica granatum
and Salvia guaranitica showed the best inhibitory effect
against Fusarium oxysporum f.sp. lycopersici . Our results
indicate that plant extracts with a good antifungal activity
generally had a high level of total polyphenolic content
and titratable acidity, and low values of pH.
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