Stigmina/SNEED Needlecast
HIGHStigmina lautii
Overview
A fungal disease of spruce very similar in appearance to Rhizosphaera needlecast but caused by a different fungus. Often occurs alongside Rhizosphaera. It has become increasingly recognized as a major cause of spruce needle loss, particularly on Colorado blue spruce. Diagnosis requires microscopic examination to distinguish from Rhizosphaera.
- Type
- Fungus
- Severity
- HIGH
- Source
- Purdue University Extension
Symptoms
Purple-brown to black discoloration of needles, premature needle drop from lower and inner branches progressing upward, rows of dark fruiting bodies on needles (slightly different pattern than Rhizosphaera under magnification), progressive thinning of canopy over multiple years, second-year and older needles most affected
Affected Species
Geographic Spread
Treatments
Fungicide Application
Similar treatment to Rhizosphaera: apply chlorothalonil or copper-based fungicide in spring when new growth is emerging. Two applications 3-4 weeks apart, repeated annually for 2-3 years.
Species Replacement
In cases of severe chronic infection, consider replacing Colorado blue spruce with more resistant species such as Norway spruce, Serbian spruce, or native conifers better adapted to the site.
Recommended Products & Tools
Helpful supplies for managing Stigmina/SNEED Needlecast. Always read and follow label directions, and confirm a diagnosis before treating.
Broad-spectrum protectant for many fungal leaf and bark diseases.
Preventive spray for needle cast, leaf spots, and blights.
Sharp, clean cuts to remove affected wood — a tree-care essential.
As an Amazon Associate, TreeIssues may earn a commission from qualifying purchases made through these links — at no extra cost to you.
Frequently Asked Questions
What is Stigmina/SNEED Needlecast?
A fungal disease of spruce very similar in appearance to Rhizosphaera needlecast but caused by a different fungus. Often occurs alongside Rhizosphaera. It has become increasingly recognized as a major cause of spruce needle loss, particularly on Colorado blue spruce. Diagnosis requires microscopic examination to distinguish from Rhizosphaera.
What are the symptoms of Stigmina/SNEED Needlecast?
Purple-brown to black discoloration of needles, premature needle drop from lower and inner branches progressing upward, rows of dark fruiting bodies on needles (slightly different pattern than Rhizosphaera under magnification), progressive thinning of canopy over multiple years, second-year and older needles most affected
Where is Stigmina/SNEED Needlecast currently found?
Stigmina/SNEED Needlecast is currently active in Colorado, Connecticut, Iowa, Illinois, Indiana, Kansas, Kentucky, Massachusetts, Michigan, Minnesota, Missouri, Nebraska, New Jersey, New York, Ohio, Pennsylvania, South Dakota, Virginia, Wisconsin, West Virginia. It has been reported in 20 total states across the United States.
What plants are affected by Stigmina/SNEED Needlecast?
Stigmina/SNEED Needlecast affects Colorado Blue Spruce, Norway Spruce. Susceptibility varies by species.
How do I treat Stigmina/SNEED Needlecast?
Treatment options for Stigmina/SNEED Needlecast include: Fungicide Application, Species Replacement. Treatment approaches may include chemical, biological, cultural, and mechanical methods depending on the severity and context.