Utah Plant Pest Diagnostic Lab

Diseases Diagnosed in July 2010

Powdery Mildew

Scientific Name: Sawadaea sp

powdery mildew

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

fireblight

fireblight

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

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


Summer Patch

Scientific Name: Magnaporthe poae

summer patch

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

cytospora cankers

cytospora cankers

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

slime mold

slime mold

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

leaf scorch

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

herbicide damage

herbicide damage

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

early blight

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.

shothole disease

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

leaf blight

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

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; Utah State Horticulture


Fruit Rot (Choanephoraceae)

Scientific Name: Choanephora cucurbitarum

fruit rot

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.

root rot

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.

verticilllium wilt

Photo(s): Howard F. Schwartz Colorado State University, Bugwood.org

Situation: Peppermint

County: Cache

Fact Sheets: Utah Pests IPM

*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.