Tapioca pearls: a potential substitute for agar in microbiological media uri icon


  • Chickpea dextrose tapioca (CDT), potato dextrose tapioca (PDT) and potato dextrose agar (PDA) were tested for their ability to sustain growth of the groundnut pathogens Cercospora arachidicola (Mycosphaerella arachidis), Rhizoctonia bataticola (Macrophomina phaseolina) and Sclerotium rolfsii (Corticium rolfsii). All 3 media allowed isolation of C. arachidicola and supported growth of all 3 pathogens. Sclerotial production differed according to media and pathogen. Fewer sclerotia of C. rolfsii were produced on CDT and PDT compared with PDA. More sclerotia of M. phaseolina were produced on PDT than on PDA. CDT and PDT also supported growth of Aspergillus niger and A. flavus, but sporulation of these 2 pathogens was less on CDT and PDT than on PDA

publication date

  • 1995