Mark from Saint Maries, Id writes
A beetle has been killing portions of the cambium on my 7 yr. old Aspen.
While you can use the Ferti-lome Tree and Shrub Systemic Drench to treat aspen trees, we cannot guarantee that this will control the specific insect that may be in your trees. Certain bark beetles get just under the bark but not deep enough into the trees to be affected by insecticides, while others are deep enough to contact systemic applications.
Answer last updated on: 04/03/2020