Biological control of <i>Trichothecium roseum</i> by using indigenous strains of <i>Trichoderma harzianum</i> isolated in Algeria

Abstract

The present study focuses on the in vitro antagonistic effect of Trichoderma harzianum against tomato cryptogrammic disease in the region of Wadi Righ; in order to introduce them into a biological control program. The fungus Trichotecium roseum was isolated from tomato plants that have fungal diseases symptoms; they were confronted directly with antagonistic strains of T. harzianum at a temperature of 26° C. The confrontation revealed that at the end of six days maximum, strains inhibited the mycelia growth of phytopathogenic species.

Beyond the 6^thday, T. harzianum invades the colonies of T. roseum with 57.9, 48.29 and 32.8% obtained with the strains (ST1, ST2, ST3) respectively, revealing its highly inhibitory activity. T. harzianum strains have a real antifungal potential against T. roseum and can constitute an alternative to chemicals and used as a biological control because they have succeeded in inhibiting this phytopathogenic agent growth.