Studies on cultural and morphological characters of black mould of onion caused by Aspergillus niger (Van Tiegh.)

Abstract

Cultural and morphological studies of black mould of onion caused by Aspergillus niger on different media revealed that there were variations in its colony characters, shape, growth and morphological characters. Richard’s agar medium shown maximum mycelial growth (90 mm) and sporulation (+++++), Conn’s agar medium shown mycelial growth (89.63) and sporulation (+++++) and Potato dextrose agar supported best mycelial growth (88.60) and sporulation (+++++) of Aspergillus niger. However, the large sized conidiophore were produced on the Richard’s agar which was followed by others. However, small sized conidia were noticed on Tap water agar and Ashbys agar. The maximum average conidiophore length was recorded on Richard’s agar while minimum setae width was observed on Ashby’s agar.