Albert from Hinsdale, Nh writes
For disease control on blue spruce trees, we generally recommend using Clearys Spectro 90 WDG. It is recommended that you spray every 3-4 weeks until the conditions are no longer favorable for disease development. Since this product is a curative, you will use it when the disease appears so this could be at any time of the year. Be sure to consult an arborist if you are not sure of the specific issues with your trees.
Answer last updated on: 03/21/2017
