Studies on Biochemical basis of resistance to turcicum leaf blight of maize caused by Exserohilum turcicum revealed that the total sugar content was more in resistant genotypes Nithyashree and Hema as campared with susceptible genotypes, 219J and CM-202 when estimated following Nelson‟s modification of Somogyi‟s method. It was evident that total phenol content through folin-ciocalteau reagent method, Lowry method of protein estimation total protein content and Estimation of tannins by vanillin hydrochloride method revealed that total phenol, protein and tannin contents were more in resistant genotype than in susceptible genotypes and there was significant increase in both the genotypes with severity of disease respectively. | Biochemical basis of resistance to turcicum leaf blight of maize caused by exserohilum turcicum (Pass.) leonard and suggs