Mycopathologia et mycologia applicata

, Volume 46, Issue 4, pp 335–339 | Cite as

Starch utilization by Phytophthora spp

  • H. H. Ho
  • Barbara Foster


Phytophthora spp. were grown on artificial starch agar medium. In some cases, the capacity of starch utilization could be a useful tool in species separation ofPhytophthora. Based on the ability to hydrolyse starch,P. palmivora andP. parasitica could be readily distinguished, whereasP. parasitica andP. parasitica var.nicotianae, P. megasperma andP. megasperma var.sojae (P. sojae) behaved similarly. Starch hydrolysis was indicated by a clear unstained zone within the fungal colony when treated with iodine solution. Simple quantitative analysis of starch hydrolysis was made feasible by the following formula:

Starch Hydrolysis Index (S.H.I.) = Mean diameter of clear starch hydrolysis zone (d) / Mean diameter of fungal colony (D)


Hydrolysis Starch Agar Iodine Agar Medium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Dr. W. Junk N. V. 1972

Authors and Affiliations

  • H. H. Ho
    • 1
  • Barbara Foster
    • 1
  1. 1.Department of BiologyState University CollegeNew Paltz

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