What are the microorganisms that can grow in PDA medium and turn the medium into a red color?

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Jakub Grzesiak

Fusarium spp.

Phil Geis

Does not appear to be a pure culture. Suggest you Gram stain

Michael J. Benedik

There are many different bacteria that can give red colonies, so you shouldn't make any assumptions from the color. For example Staph aureaus can give red colonies, Serratia marscens, some Halobacter species, and according to Jakub Grzesiak some Fusarium species.