The influence, in vitro, of nitrogen sources on growt, mycelium density and sporulation of moroccan isolates of M. grisea population has shown that the nitrogen substances tested have been used to various degrees by this parasite, thus allowing to differentiate betwen them. Results obtained with two synthetics aminoacids 2 -(4-méthyl phenyl) 2 - méthoxy ß-alanine methyl ester and 2 -(4-méthyl phenyl) 2 - éthoxy ß-alanine éthyle ester, show clearly that these products are less used than alanine. All the isolates, however, prefer nitric nitrogen to ammoniacal nitrogen.
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