Feel free to post them here too. I don't look at the blogs myself. And if it is a root problem, it might not really fall into a pest and disease category.
The roots should be firm and usually white on Dendrobiums, although old roots can be brownish just from age and from the tannins in bark staining them. So long as they are not hollow or mushy there is likely life in them.
I looked at the photos you edited into the first message in this thread. I don't know what that is. I wonder whether it might be mechanical damage, or insects sucking on the leaves.
__________________ May the bridges I've burned light my way.
Guarderò alle radici. Mi prenderò foto delle radici da condividere come io sono nuovo a questo e non sicuro di sapere cosa turbato radici assomigliano. La ringrazio molto per la risposta al mio post.