We had 3 Pakistan mulberry trees that were purchased last year as bare root trees (they are grafted). They were planted last Spring and were all growing beautifully. They grew many new branches and huge leaves. We removed most flowers/fruit so that they could focus on root growth. This spring they were all three starting to bud out and then the next thing we noticed all the newly forming buds had turned black and died. The bark started peeling off around the base and also along the trunk/branches especially at the joints. One of the three trees is still showing signs of life, but only barely. It is growing one spot of leaves on one branch. These trees were over 6 feet tall. The other two appear to be completely dead but have strong root systems (they are not easily pulled out of the ground). The trees survived our ice storm this winter and the dead buds did not happen due to cold weather as far as we can tell. We are located in Noti (30 minutes west of Eugene). The soil is excellent and we gave them plenty of compost when they were planted. They are also well watered. The other trees/shrubs/asparagus/strawberries/herbs in the orchard are doing fine. Is there any why to find out what happened to them? We want to replace them, but don't want a disease to kill the new trees.