Hello,

I have a large 12 year old cactus (unfortunately I don't know the type) and a clone (3 years old) that, up until this summer, were healthy. They usually live inside during the winter and outside during the summer. I'm having a hard time identifying the issue here. I have other clones that were not put outside and are fine. I thought maybe sun burn but seemed odd that the bottom got the worst of it. Was planning to repot next summer and maybe remove some of the more damaged branches. I also had some moth damage on a rug near the large one, and thought maybe this might have something to do with it? Any advice? Large sentimental value! Pics below. Thanks!