In vitro biological control of Colletotrichum gloeosporioides (Penz.) Sacc. and Sclerotium rolfsii Sacc., causal agent of anthracnose and soft rot of Corchorus capsularis L.

摘要

Antagonistic potentials of two soil fungi viz., Aspergillus niger van Tieghem and Trichoderma viride Pers. ex Gray against two fungal pathogens of jute plants, namely Colletotrichum gloeosporioides (Penz.) Sacc. and Sclerotium rolfsii Sacc. were evaluated by dual culture technique and the efficacy of volatile and non-volatile metabolites released by them was evaluated by 'inverted plate method' and 'poisoned food technique'. In dual culture colony interaction, A. niger and T. viride showed 50 and 50.78% growth inhibiting effect of C. gloeosporioides. The same antagonistic fungi also showed 53.56 and 69.71% growth inhibition of S. rolfsii. Volatile metabolites from T. viride showed growth inhibiting effect of S. rolfsii (46%) and C. gloeosporioides (35.78%). Growth inhibiting effect of more than 50% was noted owing to the non- volatile metabolites of A. niger and T. viride on C. gloeosporioides at 20% concentration. These results suggest that T. viride may be exploited commercially as a biocontrol agent of anthracnose and soft rot pathogens of jute.