Nitrogen utilization of highly and weakly virulent isolates of Colletotrichum falcatum Went

Nine inorganic nitrogenous compounds and sixteen amino acids were used to study the growth and sporulation of highly and weakly virulent isolates ofColletotrichum falcatumWent. Potassium nitrate, sodium nitrate and calcium nitrate supported good growth, while ammonium phosphate, potassium nitrate and sodium nitrate supported good sporulation of both isolates. Among the amino acids tested, glycine and DL-alanine were best for growth, and DL-threonine, L-leucine, DL-tyrosine, DL-serine, DL-phenylalanine and L-cystine for sporulation. No correlation existed between virulence and growth but the highly virulent isolate sporulated significantly more than the weakly virulent isolate.This work is a part of the author's Ph. D. Dissertation submitted to the Faculty of the Graduate School of the College of the Agriculture, University of the Philippines (1969).