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30   POTATO-DEXTROSE AGAR

Potato, peeled and cut  200.0     g
Glucose  10.0     g
Agar  15.0     g
Distilled water  1.0     L
Boil potatoes for 20 min. Strain through a fine sieve. Add glucose and agar, and boil until dissolved. Do not use new potatoes.
Adjust pH to 5.4 - 5.6.
Comment: Commercial Potato dextrose agar (Difco or Oxoid) is also available.