Diseases Diagnosed in July 2010

    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.