Alberta (dwarf) Spruce brown spot cure?

[Fuddyduddy1952]

I have islands I planted in the yard with a variety of trees, flowers & bushes and most I planted a Dwarf Alberta Spruce tree. I planted when they were about a foot tall and water when no rain especially first 2 years.
The most recent one has this dead/brown area at base. Others (3 to 9 ft tall) are doing fine.
Any ideas what I can do are appreciated.

 

[Midniteoyl]

Last time I had this on my full grown Spruces it was Spider Mites. This is in N. Indiana, dont know if you have them up there.

 

[Fuddyduddy1952]

Last time I had this on my full grown Spruces it was Spider Mites. This is in N. Indiana, dont know if you have them up there.

Could be. I have Seven Dust...would that work?

 

[Midniteoyl]

Could be. I have Seven Dust...would that work?

Not sure. I used Malathion at the time. Sure just about any type of spray would work to kill them quickly, then dust to keep them away..