We have a mature Deodar in the front yard that has died. This has happened over the last few years until it's completely bare today. I have tried to research why this would happen and mostly come up with a disease or cedar bark beetles, but I am not sure of either. My issue now is, I have two more Deodar trees in the back yard, both of which appear now to be rapidly dying (much faster than the one in the front yard). Can anyone help me to find out what is wrong and if there is anything at all I can do to save the trees?