Biological control of Trichothecium roseum by using indigenous strains of Trichoderma harzianum 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.