The term ‘allelopathy’ was coined to describe the effect of the one plant on neighbouring plants. The word Allelopathy has been derived from two Greek words Allelon meaning ‘each other’ and Pathos meaning ‘to suffer’ i.e. the injurious effects of one plant upon another However, Molisch (1937) coined this term which refers to all biochemical interactions (stimulatory and inhibitory) among plants, including micro-organisms