Peter, we have spruce trees and this year one of the blue spruce has a verticle line of dead branches. I am not sure what to do or if it will expand. Also, we have another 3 spruces in a row and the branches are drooping and the bottom branches have died 1/4 way up the tree. We feed them every year so I am not sure what we need to do. We have pictures but we’re unable to attach them to this email. Thanks.
It is normal for the lower branches of spruce trees to die off as it grows. The upper branches shade them out. As far as the vertical line of dead branches…if it is on the north side it could be winter kill. If not, then it could be insects like a borer that gets under the bark. This can be treated with Bonide Annual Tree and Shrub Insect Control, a liquid that will be taken up by the free and kill any insects that are in or feeding on the tree.