Utah Plant Pest Diagnostic Lab

Diseases Diagnosed in May 2011

Black Root Rot

Scientific Name: Thielaviopsis basicola

black root rot

Photo(s): Black root rot on a tobacco plant, R.J. Reynolds Tobacco Company Slide Set, R.J. Reynolds Tobacco Company, Bugwood.org.

Situation: On roots

County: Salt Lake County, Cache

Fact Sheets: Utah State University


Pink Snow Mold

Scientific Name: Microdochium nivale

pink snow mold

Photo(s): An area affected by pink snow mold on a golf course, William M. Brown Jr., Bugwood.org.

Situation: Turf

County: Salt Lake County

Fact Sheets: Utah State University


Basal Rot

Scientific Name: Fusarium calmorum

basal rot

Photo(s): Fusarium basal rot, A.F. Sherf, Cornell University.

Situation: On Garlic

County: Salt Lake County

Fact Sheets: Oregon State University; UC IPM


Spring Black Stem Disease

Scientific Name: Phoma medicaginis

black stem disease

Photo(s): Stems and leaves affected by black stem disease, University of Georgia Plant Pathology Archive, University of Georgia, Bugwood.org.

Situation: Alfalfa

County: Salt Lake County

Fact Sheets: Utah State University; University of Nebraska Lincoln


Crown Rot

Scientific Name: Fusarium oxysporum

crown rot

Photo(s): Crown rot in onions characterized by browning of the leaves and stunted growth, Howard F. Schwartz, Colorado State University

Situation: na

County: Salt Lake County

Fact Sheets: Cornell University; UC IPM


Phytophthora Root Rot

Scientific Name: Phytophthora sp

phytophthora root rot

phytophthora root rot

Photo(s): (Top) Apple tree infected with root rot; (Bottom) Pepper plants showing signs of being infected with phytophthora root rot, William M. Brown Jr., Bugwood.org.

Situation: Laurel

County: Salt Lake County

Fact Sheets: Alabama Cooperative Extension System


Necrotic Ring Spot

Scientific Name: Ophiosphaerlla korrae

nectrotic ring spot

Photo(s): Necrotic ring spot, Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org.

Situation: Turf

County: Salt Lake County

Fact Sheets: Utah State University; Colorado State University

*Links on the page are not intended as authoritative sources of management information. Established links allow users to view pictures of pests and find general biology and control information; for Utah-specific control recommendations please contact the Utah Plant Pest Diagnostic Lab @ 435-797-2435. Pictures above are not always the exact species identified, but are representative photos of submitted samples.