What are the methods for preventing and controlling pests and diseases in clivia (Clivia miniata)?

First pry the leaves open with a hard object, then use a sterilized knife to gently scrape the rotten flower stalk clean, then pour oxytetracycline powder onto the cut on the flower stalk and around it, and place it in a bright, ventilated spot; this will stop the rot from spreading further and save the large flower.