Diseases Diagnosed in October 2012


Plant diseases diagnosed by Utah Plant Pest Diagnostic Lab

October 2012

1. Bacterial Leaf Spot (Tomato)
2. Dutch Elm Disease (Elm Tree)
3. Needlecast (Blue Spruce)
4. Rhizopus (Squash)
5. Summer Patch (Turf)
6. Take All Patch (Turf)

Abiotic, unknown and/or non-disease stressors in October

1. Bronzing of Grape Leaves (Grapes)
2. Nutrient Deficiency - Chlorosis (Flowering Pear Tree)
3. Unidentified bacteria (squash)

*Click on thumbnails for larger images.

Bacterial Leaf Spot

Pathogen: Pseudomonas viridiflava
Situation: Tomato
County: Cache
Fact Sheets:


Dutch Elm Disease


Photo/s: USU site. Unknown photographer
Situation: Dutch Elm Tree
County: not recorded
Fact Sheets: Utah State University; USDA



Pathogen: Rhizopus

Photo/s: University of California, Davis

Situation: Squash in storage
County: Weber
Fact Sheets: North Carolina State University



Pathogen: Rhizosphaera

Photo/s: Images from the web. These images have not been verified by UPPDL.

Situation: Blue Spruce

County: Utah

Fact Sheets: New Mexico State University; Utah State University publication "Diseases of Conifers"; Ohio State University; University of Minnesota


Summer Patch

Pathogen: Magnaporthe poae

Photo/s: Summer patch in bluegrass, Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org
Situation: in Lawn
County: Wasatch
Fact Sheets: Utah State University; UDAF; Colorado State University; Ohio State University


Take-all Patch

Pathogen: Gaeumannomyces graminis var. graminis

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

Situation: in Lawn
County: Salt Lake
Fact Sheets: Purdue University; University of Connecticut


Abiotic, unknown, and/or non-disease stressors in October.

1. Nutrient Deficiency

    Photo/s: Utah State University Tree Fruit IPM Advisory, 2007

    Problem: Chlorosis
    Situation: Flowering Pear
    County: Salt Lake
    Fact Sheets: Colorado State University

2. Nutrition Deficiency - bronzing in grape leaves (grapes - Salt Lake)

3. Unknown Bacteria (Squash)

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  *Links in the table 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.