Property owners can access help addressing the spruce budworm problem thanks to the Arrowhead Forest Partnership.

Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. The disease, referred to as Rhizosphaera needle cast, is the most common problem seen on blue ...

Lab analysis is necessary to distinguish Rhizosphaera needle cast from other diseases of spruce trees. Submit a sample to the UMN Plant Disease Clinic for testing. Colorado blue spruce (Picea pungens) ...

Problem is, you may not have the space to grow a full-sized fir or large Colorado blue spruce. That’s where dwarf conifers come in. These compact versions of the large trees offer beauty ...

All other spruce needle rust fungi overwinter in the alternate host plant. In most cases spruce needle rust is a cosmetic problem and no management is needed. You can follow these best practices to ...

The Cooley gall adelgid is a problem in Douglas fir Christmas tree plantations ... Non-chemical: Do not plant the two hosts (Douglas fir and Colorado blue or white spruce) close to one another. If the ...