(5) Identification of yeasts by conventional technique Conventional identification of yeast was carried out accord- ing to the criteria described by Kurtzman and Fell (1998) based on morphological and physiological characteristics. Furthermore, additional tests for starch formation, urea hy- drolysis and Diazomium Blue B (DBB) color reaction tests were also carried out as described by Yarrow (1998). The Kurtzman and Fell (1998) and Barnett et al. (2000) keys for yeast identification were used.