Utah Plant Pest Diagnostic Lab
Diseases Diagnosed in July 2010
Powdery Mildew
Scientific Name: Sawadaea sp
Photo(s): Powdery mildew on a maple leaf, Andrej Kunca, National Forest Centre - Slovakia, Bugwood.org
Situation: On ornamental plant
County: Utah
Fact Sheets: University of California, DavisUtah State University; Ohio State University
Fireblight
Scientific Name: Erwinia amylovora
Photo(s): Shoot of an apple tree infected with fire blight. Note the "Shepherds crook" and scorched leaves; Fire blight canker on an apple tree. The bacterial ooze seen running down the branch can be transmitted by insects, water, and other methods. Utah State University.
Situation: Crabapple
County: Cache
Fact Sheets: Utah State University; Utah State University
Phytophthora Root Rot
Scientific Name: Phytophthora sp
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
Summer Patch
Scientific Name: Magnaporthe poae
Photo(s): Summer patch in bluegrass, Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org
Situation: On turf
County: Carbon, Wasatch, Salt Lake
Fact Sheets: Colorado State University; Ohio State University; Utah State University
Cytospora Cankers
Scientific Name: Cytospora cincta
Photo(s): Signs of cytospora cankers on aspen and willow, William Jacobi, Colorado State University, Bugwood.org.
Situation: On aspen
County: Davis
Fact Sheets: Colorado State University; University of Illinois; Utah State University
Slime Mold
Scientific Name: NA
Photo(s): Slime mold fruiting bodies, Joseph LaForest, University of Georgia, Bugwood.org; Slime mold on forest floor, Tarah Kolb, Bugwood.org.
Situation: Forest floor
County: Wasatch
Fact Sheets: Utah State University; Colorado State University; Colorado State University Extension
Leaf Scorch
Scientific Name: NA
Photo(s): Sunscald (leafscorch) on tobacco plant, University of Georgia Plant Pathology Archive, University of Georgia, Bugwood.org.
Situation: Euonymus
County: Cache
Fact Sheets: Colorado State University; Colorado State University; Utah State Unviersity
Herbicide Damage
Scientific Name: NA
Photo(s): Herbicide damage caused by 2 4D, Utah State University.
Situation: Blue Spruce
County: Uintah
Fact Sheets: Utah State University
Early Blight
Scientific Name: Alternaria solani
Photo(s): Early blight affecting potato plant, Howard F. Schwartz, Colorado State University, Bugwood.org.
Situation: Tomato plants
County: Uintah
Fact Sheets: Colorado State University; University of California Davis
Shothole Disease
Scientific Name: Stigmina sp.
Photo(s): Shothole disease, Whitney Cranshaw, Colorado State University, Bugwood.org.
Situation: On peach
County: Salt Lake County
Fact Sheets: Utah State University Extension
Leaf blight
Scientific Name: n/a
Photo(s): Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Situation: Yard
County: Davis, Salt Lake, Wasatch
Fact Sheets: Oklahoma State University
Crown Rot
Scientific Name: Fusarium oxysporum
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; Utah State Horticulture
Fruit Rot (Choanephoraceae)
Scientific Name: Choanephora cucurbitarum
Photo(s): Howard F. Schwartz, Colorado State University, Bugwood.org
Situation: Zucchini
County: Grand
Fact Sheets: University of Minnesota
Root Rot
Scientific Name: Rhizoctonia sp.
Photo(s): Clemson University - USDA Cooperative Extension Slide Series, Bugwood.org
Situation: Lavender from greenhouse
County: Utah
Fact Sheets: University of California
Verticillium Wilt
Scientific Name: Verticillium dahliae.
Photo(s): Howard F. Schwartz Colorado State University, Bugwood.org
Situation: Peppermint
County: Cache
Fact Sheets: Utah Pests IPM