Q.new juniperus spartan
with the new hedging that we set in april of this year
some of our trees are producing brown branches these appear to b dead
“will this kill the plant completely”
also there are black spots on our mountain ash “rowan”

This link will help you identify the most common issues with your hedge plantings.
http://www.clemson.edu/extension/hgic/pests/plant_pests/shrubs/hgic2056.html
Make sure the new plantings are receiving adequate water to become established.
This link will help you access your Ash Tree issues.
https://extension.psu.edu/pests/plant-diseases/all-fact-sheets/ash-diseases