Drench of Arborvitae for Phytopthera mold
The arborist recommended just the mold inhibitor drench. He did not recommend spraying for spider mites since they are secondary to the mold infestation and really an indicator of the mold problem. Verified with a consulting arborist friend that this was a good plan which he confirmed. The technician came, did the work, and supplied the invoice. They will come again in the Spring to see if this gets the Phytopthera under control. I have 13 other Arborvitae that I would like to save.