Diseases Diagnosed in September 2012

    Diseases Diagnosed in September 2012

    Corn Smut

    Pathogen: Ustilago maydis

    corn smut

    corn smut

    corn smut

    corn smut

    Photo(s): Corn smut on sweet corn taken by Jim Hubbell. Corn Smut on tassel of corn taken by Claudia Nischwitz, Utah State University.

    Situation: on corn

    County: Cache

    Fact Sheets: Cornell University


    Downy Mildew

    Pathogen: Plasmopara obducens

    Photo(s): Downy Mildew on impatiens taken by Claudia Nischwitz, Utah State University

    Situation: Impatiens

    County: Salt Lake

    Fact Sheets: Universiy of Florida; University of Massachusetts, Amherst


    Fairy Ring, Type II

    Pathogen: Basidiomycetes

    fairy ring

    Photo(s): Fairy Ring Spot taken by Claudia Nischwitz, Utah State University

    Situation: in Lawn

    County: Cache, Wasatch

    Fact Sheets: Plant Clinic; Turf files


    Fusarium sp.

    Pathogen: Fusarium sp

    Situation: Ornamental Plant - Blue Mist Spirea

    County: Salt Lake

    Fact Sheets:


    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


    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, Davis


    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


    Tomato Spotted Leaf Virus

    Scientific Name: Varies - transported by thrips

    tomato spotted leaf virus

    tomato spotted leaf virus

    tomato spotted leaf virus

    tomato spotted leaf virus

    tomato spotted leaf virus

    Photo(s): TSLV in a tomato taken by Claudia Nischwitz, Utah State University.

    Situation: Tomato

    County: Cache

    Fact Sheets: Utah State University Extension News; Cornell University


    Take-all Patch

    Scientific Name: Gaeumannomyces graminis var. graminis

    take all patch

    Photo(s): Take All Patch taken by Claudia Nischwitz, Utah State University

    Situation: in Lawn

    County: Wasatch

    Fact Sheets: Purdue University; University of Connecticut


    Abiotic, Unknown cause and non-disease stressors in August

    1. Chemical (Turf)
    2. Lack of Calcium - Catface (Tomato)

      Problem: Lack of Calcium

      catface on tomato

      Photo/s: Catfacing on tomato from Utah State University IPM Advisory.

      Situation:Catfacing on Tomato

      County:Box Elder

      Fact Sheets: University of California Davis; Oklahoma State University

    3. Overwatering (Turf)
    4. Abiotic (Blue Ash Tree); (English Columnar Oak)
    5. Potassium Deficiency/ Drought Stress (Apricots)
    *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.