Utah Plant Pest Diagnostic Lab
Diseases Diagnosed in September 2012
Corn Smut
Pathogen: Ustilago maydis
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
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
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
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
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
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
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
- Chemical (Turf)
- Lack of Calcium - Catface (Tomato)
Problem: Lack of Calcium
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
- Overwatering (Turf)
- Abiotic (Blue Ash Tree); (English Columnar Oak)
- Potassium Deficiency/ Drought Stress (Apricots)