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: In several regions of the world, Fusarium oxysporum causes losses on tomato crops; for control it, chemical fungicides are used. Nevertheless, these fungicides causing environmental and resistance problems; therefore, ecological alternatives as plant extracts have been developed. Due to the aim of this work, identify phytochemicals present in ethanolic and aqueous extracts from Agave lechuguilla qualitatively, Carya illinoinensis , Jatropha dioica , Larrea tridentata, and Lippia graveolens and determine their antifungal activity against F. oxysporum. Method : The plants collected from the northeast of Mexico; crudes and concentrated plant extracts obtained; the inhibition percentage and inhibitory concentration to 50 % (IC 50 ) of F. oxysporum for each plant extract were determinate trough microdilution in the plate method Results : The essential phytochemicals were flavonoids, saponins, tannins, and quinones. The antifungal activity showed at 1000 mg/L inhibition around 40 to 60% by aqueous crude extracts from leaves of L. graveolens and concentrated aqueous extracts from the stem of L. graveolens, respectively. The ethanolic extracts presented 100 % of inhibition for crude extracts of husk from C. illinoinensis ; in leaves and stem from L. graveolens the inhibition started from 250 mg/L; for resuspended extracts, the inhibition started from 125 mg/L with L. graveolens stem and leaves; and finally in roots of A. lechuguilla and leaves from L. graveolens the inhibition started from to 250 and 500 mg/L respectively. The best IC 50 was of 8.02 mg/L from the ethanolic resuspended extract of L. graveolens stem. Conclusion : The ethanolic plant extracts from L. graveolens , A. lechuguilla, and C. illinoinensis , showed 100 % of inhibiting activity against the development of F. oxysporum , representing an alternative for control of F. oxysporum .

nova scientia

Antifungal activity of phytochemical compounds of extracts from Mexican semi-desert plants against Fusarium oxysporum from tomato by microdilution in plate method