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Your plant has a fungal or bacterial rot disease which is probably due to poor growing conditions and maybe over watering. Try to scrape off the mouldy, rotten tissue and dust it with sulphur. There is no fungicide available for the control of this disease.
Yucca's are desert plants. They need to be grown in full sun, such as a south window, not a northern exposure. Without adequate light, the plant will slowly deteriorate.
A much better method of watering the plant is to thoroughly soak the soil by adding water from the top of the pot. Keep adding water until it runs out of the drainage holes in the pot. Do not let the pot sit in this excess water as it will keep the soil too wet. I set all of my potted plants on pieces of 2 inch thick wood that sit in the watering trays. Excess water is below the pot and there is no need to lift and remove the pot each time the plant is watered. A Yucca plant that has constantly wet soil is prone to root rot and stem rot. Misting the plant can also lead to rot problems of the stem and leaves under poor growing conditions. Avoid getting water on the leaves.
If you can stop the rot disease from spreading, give the plant direct sunlight, and let the soils surface dry before watering the plant each time, it should survive. If the plant continues on a downhill swing, take it out of the pot and check the roots for signs of rot. Remove any rotten roots, repot the plant in a well drained media and be careful not to overwater it, especially in the winter time. Good luck with your plant.
