Plant diseases diagnosed by the Utah Plant Pest Diagnostic Lab in July, 2011.
1) Powdery Mildew
2) Fire blight
3) Phytophthora Root Rot
4) Summer Patch
5) Cytospora Canker
6) Slime Mold
7) Leaf Scorch
8) Herbicide Damage
9) Early Blight
10) Shot hole disease
11) Leaf Blight (Phyllosticta)
12) Crown Rot
13) Fruit Rot
14) Root rot
15) Veticillium Wilt
Scientific Name: Sawadaea sp
Photos: Powdery mildew on a maple leaf, Andrej Kunca, National Forest Centre - Slovakia, Bugwood.org
Situation: On ornamental plant
County: Utah
Fact Sheets:
Utah State Univ.; Ohio State Univ.; University of California, Davis
Scientific Name: Erwinia amylovora
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: Utah
Fact Sheets:
Utah State Univ.; Utah State Univ.
Scientific Name: Phytophthora sp
Photo(s): Apple tree infected with root rot; Pepper plants showing signs of being infected with phytophthora root rot, William M. Brown Jr., Bugwood.org.
Situation: Lavender
County: na
Fact Sheets:
University of California, Davis; Utah State Univ.; Utah State Univ.; Utah State Univ.
Scientific Name: Magnaporthe poae
Photos: 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:
Summer Patch
Utah State Univ.; UDAF; Colorado State Univ.; Ohio State Univ.
Scientific Name: Cytospora cincta
Photo(s): Signs of cytospora cankers on aspen and willow, William Jacobi, Colorado State University, Bugwood.org.
Situation: On plant
County: Davis County
Fact Sheets:
Colorado State Univ.; Colorado State Univ.; Ohio State Univ.; Univ. of Illinois; Utah State Univ.
Scientific Name: NA
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 Univ.; Colorado State Univ.; Colorado State Univ.; Colorado State Univ.
Scientific Name: NA
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 Univ.; Colorado State Univ.; Utah State Univ.; Utah State Univ.
Scientific Name: NA
Photo(s): Herbicide damage caused by 2 4D, Utah State University.
Situation: Blue Spruce
County: Uintah
Fact Sheets:
Utah State Univ.; Colorado State Univ.; Colorado State Univ.
Scientific Name: Alternaria solani
Photo(s): Early blight affecting potato plant, Howard F. Schwartz, Colorado State University, Bugwood.org.
Situation: Tomato plants
County: Uintah
Fact Sheets:
Colorado State Univ.; Univ. of California, Davis; Univ. of California, Davis; Ohio State Univ.
Scientific Name: Stigmina sp.
Photo(s): Shothole disease, Whitney Cranshaw, Colorado State University, Bugwood.org.
Situation: On peach
County: Salt Lake County
Fact Sheets:
Utah State Univ.
Photo(s): Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org
Situation: Yard
County: Davis, Salt Lake, Wasatch
Fact Sheets:
Scientific Name: Fusarium oxysporum
Photo(s): H.J. Larsen, Bugwood.org
Situation: Tomato (Lycopersicon esculentum)
County: Grand
Fact Sheets:
Scientific Name: Choanephora cucurbitarum
Photo(s): Howard F. Schwartz, Colorado State University, Bugwood.org
Situation: Zucchini
County: Grand
Fact Sheets:
Scientific Name: Phytophthora sp.
Photo(s): André Bolay, St. Fédér. de Recherches Agronomiques de Changins, Bugwood.org,
Situation: Hyssop from greenhouse
County: Salt Lake
Fact Sheets:
Scientific Name: Verticillium dahliae
Photo(s): Howard F. Schwartz Colorado State University, Bugwood.org
Situation: Peppermint
County: Cache
Fact Sheets:
*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.