Annual Plant Diseases Clinic Summary - 2007 (SB 61) University of Georgia Extension This report includes both physical samples submitted to the Plant Disease Clinics and results from analyses of digital samples submitted through the DDDI system in 2007. 2014-09-29 11:05:34.0 2008-09-09 10:34:48.0 Annual Plant Diseases Clinic Summary - 2007 | Publications | UGA Extension Skip to content

Annual Plant Diseases Clinic Summary - 2007 (SB 61)

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Diseased leaf

Department of Plant Pathology
Compiled by Holly Thornton

Introduction

The Plant Pathology Department at the University of Georgia’s College of Agricultural and Environmental Sciences maintains two plant disease diagnostic clinics—one in Athens, Ga., and one in Tifton, Ga. Commercial turf, fruits, forage crops, greenhouse, ornamental nursery and homeowner samples are analyzed at the Plant Disease Clinic in Athens. Samples of commercial field crops, pecans and vegetables are diagnosed at the Plant Disease Clinic in Tifton. Diagnoses and management recommendations are returned to county faculty. The clinics maintain a computerized database of samples and their diagnoses and a reference library for use by extension agents, specialists, researchers and students.

Extension Plant Pathology specialists also participate in digital plant diagnostics using the DDDI system, which helps provide a more timely diagnosis and recommendation for a number of plant disease samples.

Some pathogens identified in the “Crop Summaries” section are listed by both genus and species, whereas others are identified as the genus or “species.” Our plant disease clinic does not routinely identify plant pathogens by species because species identification is very time-consuming and often not necessary for management recommendations. In cases where only one species is known or where species are easily identifiable, the species of the pathogen is listed.

The following abbreviations are used throughout the summaries:

PDC Plant Disease Clinic
C Commercial
IPM Homeowner IPM Clinic
H Homeowner
TDTD Too deteriorated to diagnose. This indicates that the plant sample submitted to the clinic was too deteriorated to properly diagnose.
ETRI Ectotrophic root-infecting fungi (similar to G. graminis)
GGG Gaeumannomyces graminis var. graminis
LSREP Lower stem, root or environmental problem. This diagnosis indicates that no pathogens were associated with the part of the plant submitted and that the origin of the problem either was occurring lower on the plant or was due to environmental or cultural conditions.

This report includes both physical samples submitted to the Plant Disease Clinics and results from analyses of digital samples submitted through the DDDI system. The DDDI database includes the samples contained herein and serves as a record-keeping system for our diagnostic clinics (http://www.dddi.org/uga).

Finally, it is interesting to see which sample categories have increased or decreased over the last two years. For instance, commercial herbaceous ornamental samples decreased by half from 2006 to 2007. This could be a factor of the severe drought. On the other hand, turfgrass sample submission has increased over the last year. In addition, homeowner sample numbers bounced back from 2006, when the diagnostic clinic was closed for over half the year.

Addresses for submission of physical samples to the Plant Disease Clinics are:

Athens Clinic:


Address:
Commercial turf, ornamentals, forestry and fruits
Homeowner Samples

Plant Disease Clinic
2106 Miller Plant Sciences Bldg.
Athens, GA 30602-4356
Tifton Clinic:

Address:
Commercial vegetables, row crops and pecans

Tifton Plant Disease Clinic
Room 116
4604 Research Way
Tifton, GA 31793

Information for preparation of samples for submission can be found at: http://plantpath.caes.uga.edu/extension/DiseaseLibrary.html

Plant Disease Clinic Summaries

2007 Plant Specimen Diagnoses
Crop Commercial Samples Homeowner
IPM Samples
Total
Field Crops 220 5 225
Vegetables 303 57 360
Fruits & Nuts 105 26 131
Herbaceous Ornamentals 87 47 134
Woody Ornamentals 148 91 239
Trees 80 84 164
Turf 400 95 595
Miscellaneous 7 8 15
Total* 1,350 513 1,863
*The total number of diagnoses shown here is larger than the total number of samples received (shown by Monthly Sample Submission in the table below) because some samples had more than one problem or diagnosis. The largest crop category received by the diagnostic clinics for both commercial and homeowner samples was turfgrass, followed by vegetables (commercial) and woody ornamentals (homeowner).

2007 Monthly Sample Submission Summary
  Samples
Month Commercial Homeowner
January 35 6
February 37 8
March 114 21
April 91 40
May 113 67
June 150 56
July 125 74
August 146 50
September 140 54
October 96 26
November 30 14
December 19 6
Total 1,096 422

Monthly Sample Submission (C & H)

As shown above, the busiest months in the diagnostic clinics are March and June through October. Sample numbers decrease dramatically during the winter months.

Comparisons between the number of samples submitted to the clinic and the number of diagnoses made (shown below) are for both homeowner and commercial samples. The numbers oftentimes differ due to the fact that some plant samples have multiple pathogenic organisms contributing to the death of the plant. This is especially true for turfgrass samples and diseases.

Homeowner IPM Samples & Diagnoses

Commercial Samples & Diagnoses

Distribution of Homeowner Samples by County
County Samples County Samples
Appling 1 Gwinnett 17
Atkinson 2 Hall 1
Bacon 1 Harris 8
Baker 4 Henry 5
Baldwin 2 Houston 2
Banks 1 Jackson 9
Barrow 4 Jeff Davis 3
Bartow 9 Jefferson 3
Berrien 5 Jenkins 7
Bibb 31 Johnson 1
Bryan 1 Laurens 1
Burke 1 Lee 10
Camden 1 Lincoln 1
Candler 3 Long 2
Carroll 13 Lowndes 2
Chatham 6 Lumpkin 3
Cherokee 6 Macon 2
Clarke 21 Madison 4
Clayton 1 Miller 1
Cobb 5 Mitchell 1
Coffee 1 Monroe 20
Columbia 3 Morgan 10
Cook 1 Muscogee 9
Coweta 16 Newton 7
Crawford 1 Oconee 2
Crisp 2 Paulding 2
Dade 2 Pickens 1
Decatur 2 Pierce 8
DeKalb 6 Pulaski 3
Dooly 3 Rabun 3
Dougherty 16 Randolph 1
Douglas 2 Richmond 3
Echols 2 Rockdale 4
Effingham 2 Schley 6
Elbert 1 Stephens 4
Evans 1 Thomas 1
Fannin 2 Toombs 4
Fayette 28 Troup 2
Floyd 1 Union 1
Forsyth 3 Upson 1
Franklin 1 Walker 2
Fulton 4 Walton 1
Gilmer 1 Ware 15
Glynn 1 Webster 1
Gordon 1 Whitfield 3
Grady 7 Wilkes 3
Greene 3 NA* 4
* Samples were submitted without indicating a county of origin.

Distribution of Commercial Samples by County
County Samples County Samples
Appling 5 Jasper 1
Atkinson 2 Jeff Davis 12
acon 17 Jefferson 5
Banks 1 Jenkins 2
Barrow 1 Lamar 7
Bartow 2 Lanier 8
Berrien 38 Laurens 7
Bibb 5 Lee 2
Bleckley 1 Liberty 1
Brantley 2 Lincoln 1
Brooks 1 Lowndes 58
Bulloch 10 Lumpkin 2
Burke 18 Macon 18
Butts 1 Madison 2
Calhoun 2 Marion 1
Camden 3 McDuffie 48
Candler 1 Meriwether 1
Carroll 4 Miller 19
Catoosa 1 Mitchell 11
Chatham 5 Monroe 1
Cherokee 3 Montgomery 4
Clarke 28 Morgan 12
Clay 1 Newton 2
Clinch 7 Oconee 13
Cobb 16 Oglethorpe 1
Coffee 15 Paulding 1
Colquitt 13 Peach 1
Columbia 20 Pickens 1
Cook 13 Pierce 20
Coweta 3 Polk 2
Crisp 5 Pulaski 9
Dade 1 Quitman 1
Dawson 2 Rabun 3
Decatur 7 Randolph 1
DeKalb 12 Richmond 35
Dodge 8 Rockdale 7
Dooly 10 Schley 2
Dougherty 13 Screven 6
Douglas 5 Seminole 11
Early 3 Spalding 1
Echols 17 Stephens 1
Effingham 8 Sumter 4
Emanuel 11 Tattnall 7
Evans 7 Telfair 2
Fayette 5 Tift 23
Floyd 8 Troup 1
Forsyth 10 Turner 12
Fulton 7 Union 3
Gilmer 2 Walker 2
Glynn 1 Walton 6
Gordon 6 Ware 2
Grady 20 Washington 2
Gwinnett 8 Wayne 5
Habersham 3 Webster 7
Hall 3 Wheeler 5
Harris 7 White 1
Hart 2 Wilcox 15
Henry 2 Worth 11
Houston 5 NA* 223
Irwin 9    
* Samples were submitted without indicating a county of origin.

Summary of Diagnoses by Crop

Field Crops (Total Diagnoses: C = 220; H = 5)
Diagnostic Responsibilities:  Tifton and Athens Tifton Clinic: Tobacco, Corn, Cotton, Soybean, Peanut
Athens Clinic: Homeowner samples
Host Disease Causal Organism Samples
Alecia, Hay
C = 1
H = 0
Rust   1
Alfalfa
C = 4
H = 0
Wilt
Crown and Stem Rot
Crown and Stem Rot
No Disease
Undetermined
Sclerotinia sp.
Sclerotinia trifoliorum
1
1
1
1
Amaranth
C = 2
H = 0
Root Rot
LSREP
Pythium sp. 1
1
Bahia Grass
C = 2
H = 2
Head Blight
Anthracnose
Fusarium sp.
Colletotrichum sp.
Helminthosporium sp.
Sclerotinia sp.
1
1
1
1
Bermuda, Hay
C = 2
H = 0
  Helminthosporium sp.
Colletotrichum sp.
1
1
Clover
C = 1
H = 2
Black/Sooty Blotch
No Disease
Unknown
  1
1
1
Corn
C = 14
H = 0
Southern Corn Leaf Blight
Southern Rust
Ear Rot
Smut

No Disease
Bipolaris maydis
Puccinia polysora

Fusarium sp.
Ustilago maydis
Helminthosporium sp.
2
2
2
1
1
6
Cotton
C = 14
H = 0

Rhizoctonia Soreshin
Fusarium Wilt
Leaf Spot
Leaf Spot
No Disease
Rhizoctonia solani
Rhizoctonia sp.
Fusarium sp.
Stemphylium sp.
Alternaria sp.
1
1
1
7
2
2
Fescue, Tall
C = 2
H = 0
Rust  
Bipolaris sp.
1
1
Grain, Small
C = 1
H = 0
Powdery Mildew   1
Millet
C = 3
H = 0
Leaf Spot Pyricularia sp. 3
Oat
C = 5
H = 0
Virus
No Disease
LSREP
Barley Yellow Dwarf 3
1
1
Peanut
C = 45
H = 0
Crown Rot
Leaf Scorch
Limb Rot
Early Leaf Spot
Late Leaf Spot
Funky Leaf Spot
Virus
Collar Rot
White Mold
Cylindrocladium Black Rot
Nematode Damage
Unknown



No Disease
Aspergillus sp.
Leptosphaerulina crassiasca
Rhizoctonia
sp.
Cercospora arachidicola
Cercosporidium personatum

Tomato Spotted Wilt
Diplodia sp.
Sclerotium rolfsii
Cylindrocladium crotalariae
Meloidogyne
sp.

Rhizoctonia sp.
Neocosmospora sp.
Rhizoctonia solani
3
1
1
3
1
1
7
2
2
1
1
2
1
3
2
14
Rye
C = 3
H = 0
No Disease   3
Sorghum
C = 3
H = 0
Gray Leaf Spot

No Disease
Cercospora sp.
Rhizoctonia sp.
1
1
1
Soybean
C = 70
H = 1
Charcoal Rot
Rust
Bacterial Disease
Downy Mildew
Root Rot
Stem Blight
Wilt
Stem Canker/Lesion
White Mold
Leaf Spot

No Disease
TDTD
Unknown
Macrophomina sp.
Phakopsora pachyrhizi

Peronospora manshurica
Rhizoctonia
sp.
Phomopsis sp.
Fusarium sp.
Phomopsis /Diaporthe sp.
Sclerotium rolfsii
Cercospora
sp.
Neocosmospora sp.
4
1
1
13
1
1
1
1
1
1
1
41
1
3
Tobacco
C = 43
H = 0
Collar Rot
Brown Spot
Black Shank
Black Shank Race-1
Stem Rot
Stalk Rot
Virus
Virus




No Disease
TDTD
LSREP
Sclerotinia sclerotiorum
Alternaria
sp.
Phytophthora nicotianae var. parasitica
Phytophthora nicotianae var. parasitica
Sclerotium rolfsii

Erwinia sp.
Tomato Spotted Wilt
Tobacco Mosaic
Rhizoctonia sp.
Rhizoctonia solani
Pythium sp.
Pseudomonas sp. Status and Revision History
Published on Sep 9, 2008
Reviewed on Jun 2, 2011
Reviewed on Sep 15, 2014