A study on the biochemistry is an important tool in characterizing the plant diseases through their biochemical analysis which reveals the extent of interaction between the host crop and the parasite study. Phenols are important chemical components which play major role in defense mechanism exhibited by host plants against the invading pathogens. Higher phenolic content was observed in all the inoculated host plants over uninoculated in this study. Decrease in total carbohydrates might have resulted due to the action of hydrolyzing enzymes secreted by M. incognita.