Arborvitae Black Spots ID? Pics!
Hi, we planted 7 Emerald Green Arborvitae in the back to shield to give a little privacy and the trees are doing generally all right but I have this black decaying foliage that I can't figure out what it's from?
I had worked the dirt incorporating peat and they are watered on drip irrigation throughout the hot summer, but not too much as I know they don't like it too wet. They're thrived despite having bag worms (which I have picked off mostly) in the past year, and sprayed with BT. I tried copper fungicide once, but that hasn't seemed to stop the black areas of dying foliage.
I've researched it for a while and everybody mentions animals using the trees as litter boxes, but there's only cats around, and no way could they pee up that high...
Hopefully someone can reccomend a fungicide or similar if that's the cause? I have Daconil/Chlorothalonil for my roses, which is what I use because it's too close to the veggies to use anything else.
Here is a link that might be useful: Pictures of Arborvitae disease