Q.Can I Save My Yucca Plant
Had my yuccas about 4 years but this is the 1st year its looked like this. We hardly ever water it and it always looks so healthy. I’ve sprayed it with a multi bug spray which is for plants and fruit or veg.

Certified GKH Gardening Expert
Go ahead and trim off the leaves with the large spots. I think it may be a fungal or bacterial infection. This article should help narrow down the problem:
https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plant-with-black-spots.htm