ABSTRACT
Nitrogen is one of the most important and essential nutrition required for the proper growth and development of pathogen. It is an important component required for protein synthesis and other vital functions. In the present study investigation has made on the effect of different nitrogen sources (sodium nitrate, ammonium nitrate, potassium nitrate and calcium nitrate) on the mycelial growth of Fusarium oxysporum f. sp. coriandrii causing wilt of Coriander. For this study wild sensitive and highly resistant isolate were selected. It was observed that, there was variation in the mycelial growth of the sensitive and resistant isolate on the different Nitrogen sources. However, Sodium nitrate was found to be the best source of nitrogen. Resistant isolate always showed highest growth as compared to the sensitive isolate. This research work helps to manage the growth of pathogen.