My Pagoda dogwood was young and about 4 ft tall in 2015 and grew healthy and vigorous to it's current height of about 15 feet, until the last year when we see progressively more peeling bark, splitting trunks with orange coloring, many branches without leaves, and many leaves with browning tips. Much has already been pruned back, but it still is worsening to affect almost the whole tree. Please see the photos. 3 of the 4 trunks seem to be dying, all the way down to the base. Is this tree salvageble? And if so, how? Is this what is called golden canker? If it is dying, do I need to dig out the whole root base? Can I plant another Pagoda dogwood in it's place or is the disease in the soil? Can I plant another tree instead, such as a Serviceberry?