One of the most serious rice diseases in the rice sector is fungal disease infection. Plant diseases need to be
controlled to maintain the quality and abundance of food supply. Different approaches may be used to prevent,
mitigate or control plant diseases. Beyond good agronomic and horticultural practices, growers often rely heavily
on chemical fertilizers and fungicides. A more balanced, cost effective and eco-friendly approach can be adopted by
rice farmers. Biological control is an innovative, cost effective and ecofriendly approach. Trichoderma viride is
known for its mycoparasitic and antagonistic mechanism for the control of fungal disease. They are termed bioagent
that is capable of combating a number of fungal diseases of plant crops. It is a soil borne free living fungus that
grows abundantly and produce millions of minute green coloured spores. The principle of T. viride is to use as a
biological control agent against fungal disease in rice. T. viride was isolated from agricultural soils and the in vitro
method was used to control rice disease, brown spot. The objective of this study was to evaluate the efficacy of
existing biocontrol strains T.viride for controlling paddy disease brown spot under in vitro conditions