blue spruce die off
I have lost two blue spruces to something and a third now has whatever is impacting the trees. I sprayed them with Sevin to no avail. What should I use to control whatever the pest? White pines and fur trees in my yard have not been affected just the blue spruces. The needles turn brown and drop off. Thank you,
This is an extremely common problem. You'll notice when you are driving around that all blue spruce about the age of yours have this, too. It's a fungal disease known as cytospora canker. It is fatal. It's ubiquitous on Colorado blue spruce because they are not really adapted to Maryland climate, and eventually they all get it.
Here is what you need to know: https://extension.umd.edu/hgic/cytospora-canker-spruce
Though blue spruce look lovely, we recommend replanting with a Maryland native tree or a hardier one.