Blue spruces are a favorite conifer of Iowans and several reasons. In addition to being a beautiful tree that maintains color year round, these trees make an excellent wind break and for the most par

Norman Wolf, Retired San Juan County Extension Agent Natalie Goldberg, Extension Plant Pathologist Robert Cain, Forest Pest and Detection Specialist College of Agriculture, Consumer and Environment

Blue spruce trees are susceptible to an infectious needle disease caused by the fungus Rhizosphaera. White spruce are classified as intermediate in susceptibility to the disease and Norway spruce are

Rhizospaera needle cast of blue spruce. 9 pictures Frequency2 (1 = rare 5 = annual) Severity3.5 (1 = very little damage 5 = plants killed) HostsThis disease mostly occurs on spruces that a

Colorado Blue Spruce is usually a healthy, pest resistant landscape evergreen for eastern Nebraska. Unfortunately, even this seemingly healthy plant can be affected by disease and Rhizosphaera Needle

Rhizosphaera needle cast, caused by the fungus Rhizosphaera kalkhoffii, is one of the most common diseases spruce in the urban landscape. The predominance of this disease is due to the popularity of C

Jennifer Schultz Nelson Extension Educator, Horticulture Tree problems can be very sneaky. A lot of the time they creep in, and before you know it, the problem is staring you in the face, demandi

Needles of Colorado blue spruce (Picea pungens) dropping due to rhizosphaera needlecast disease Rhizosphaera needlecast is caused by the fungus, Rhizosphaera kalkhoffii. The disease causes death an

Ohio State University Extension Fact Sheet Plant Pathology 2021 Coffey Road, Columbus, OH 43210-1087 Rhizosphaera Needlecast on Spruce HYG-3059-96 Nancy J. Taylor Stephen T. Nameth Spruce,

Several conifer species can be infected by Rhizosphaera Needlecast, but this disease is most commonly found on Blue Spruce trees. Healthy Blue Spruce trees will retain their needles for 5 – 7 years.