Root Disease Oomycetes Overview: These are NOT fungi** …but called ‘water molds’ Cell walls are cellulose based, not chitin based like fungi & insects Require Oomycete specific materials [Oomycides] Often … Read More
Rhizosphaera Needle Cast Overview: Caused by several fungi species in the genus Rhizosphaera Impacts spruce trees Specifically, Colorado blue spruce, white spruce, and Oriental spruce Norway and red spruce are more resistant … Read More
Swiss Needle Cast Overview: Fungal disease caused by the fungus Nothophaeocryptopus gaeumannii (aka: Phaeocryptopus gaumannii) Impacts Douglas-fir Growth and symptom development is favored by wet environmental conditions Needles become discolored (blotchy yellow or completely … Read More
Rhabdocline Needle Cast Overview: Foliage disease caused by fungi in the genus Rhabdocline Primarily impacts needles of Douglas-fir (Pseudotsuga menziesii) from seedling stage to 30 years of age Outbreaks are associated with … Read More
Needle Cast Diseases Overview: There are many diseases that impact conifer foliage Particularly harmful to Douglas fir and spruce trees Causes needles to turn brown, yellow, or purple, and eventually drop … Read More
Rust Diseases (Gymnosporangium spp.) Overview: Cedar-Apple Rust: G. juniperi-virginianae Cedar-Hawthorn Rust: G. globosum Cedar-Quince Rust: G. Clavipes Found on Juniperus host – late fall through early spring Found on Rosaceous hosts – early spring through late fall Produce two … Read More
Boxwood Blight (Calonectria pseudonaviculata) Overview: Fungal infection – caused by Calonectria pseudonaviculata Characterized by leaf spots, rapid defoliation, and stem lesions Leaves turn brown or yellow, with darker boarders Stem … Read More