fungal disease

Hi all, I recently picked up a piece of Colorado Blue Spruce nursery stock. I really like the tree. However, CBS seem to be quite susceptible to a number of pests and diseases: Rhizosphaera needle cast, Cytospora canker, rust, bagworms, mites, etc. CBS in my area are all struggling. Do...

Picked up this scots pine from a local nursery in Massachusetts recently and I am worried it may have needle blight/cast. Though many needles look healthy others are turning brown and falling off. Some of the lower branches seem to be dying back completely. The tree is in dire need of repot...

I usually fertilize trees with high levels of nitrogen (18-18-18 or 19-6-20), but this years some trees have a fungal infection due to the wet and cold spring. I've heard that high nitrogen during this period make trees more susceptible to fungal infections, is that true? But what then to do...