We just removed three large Dwarf Alberta Spruces that were over twenty years old. These evergreens had spider mites that we had chemically battled using sprays that were recommended by knowledgable sources. In replacing those trees, we purchased two lovely large Blue Globe Spruces that we would like to plant in the same area where we removed the Dwarf Albertas. We are concerned that the spider mites could infest these beautiful, healthy conifers, too. Your suggestions, please!