Answer: Oh, what a shame to have your huge cereus break like that, and now start to rot! This often happens to cacti that are wounded - the big, juicy leaves are very inviting to rot fungi and bacteria. I know your situation was an emergency, but usually it's best to allow cuttings to heal for 2-3 weeks in a shady place before potting them up. You can try to remove the infected leaf pieces, then place the plants in a cool, shady area with minimal humidity (I hope you can find such a place, in the Georgia spring!) to aid healing. Sterilize your knife before making each cut by wiping it with alcohol or 10% clorox solution. Good luck!
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