Hi, 

Dwarf Alberta Spruce don't love our mid-Atlantic Climate, they also tend to not do well near foundations like this. The reflective heat from the house and pavement can cause them to get spider mites, a common ailment.  Sevin wouldn't be the best treatment for this. First you should check for mites by holding a white piece of paper under the branches and tapping them (explained on the link). You can try a horticultural oil, or hosing off the plant with a strong stream of water, as it specifies on the resource page we linked to, however at this state of damage and given the location, we would recommend that you just remove the plant and install something else. 

If you would like help with recommendations for a replacement plant, please let us know. 

Emily