1 You said Geotrichum only attacks medias CDR? the Geotrichum not attack DVDR discs?
2 I'm worried if my CDR and DVDR media will be destroyed by Geotrichum or any other type of fungus, I can not control the humidity and temperature, I live in the state of Ceara Brazil is hot here near 40 degrees and season of rain has a lot of moisture but I can not control it
Geotrichum has been blamed for destroying the aluminium and data-storing polycarbonate resin of compact discs, but the destruction process has not been confirmed.
I haven't heard anyone having issues in tropical countries, but generally, try to keep the discs in normal humidity conditions.