Important Reminder

Many common plant problems can be identified through the exchange of digital images / video so we strongly encourage our member gardens to engage their diagnosticians via email prior to submitting a physical sample. They will provide guidance on what type of documentation would be most useful and whether or not a physical sample is necessary for identification.

You can find contact information for your state's diagnostic lab below.

That said, please complete this webform whenever and whereever you are submitting a sample for diagnosis so that we can document the contribution that public gardens are making to our knowledge about plant pests and diseases. When you submit the webform, a packing slip will automatically be generated and emailed to you. Please print this packing slip and attach it to your lab's sample submission form and include both when sending in your sample. The sample submission forms vary from sate to state but you can use the following directory to find yours!

NPDN Diagnostic Lab Contact Information

Click on the abbreviation for your state to be taken directly to that entry.

AL, AK, AZ, AR, CA, CO, CT, DE, FL, GA, HI, ID, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MS, MO, MT, NE, NV, NH, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY; Canada

Or explore NPDN's Homepage here!




Cooperative Extension Service, University of Alaska

P.O. Box 75-8155

1000 University Ave

Fairbanks, AK 99775

Michele Hebert – 907-474-2423



Auburn University                      

ALFA Agricultural Services Bldg

961 South Donahue Dr.

Auburn University

Auburn, AL 36849



Plant Diagnostic Lab

C. Beaty Hanna Horticulture and Environment Center

2612 Lane Park Rd.

Birmingham, AL 35223




University of Arkansas Plant Health Clinic

University of Arkansas   2601 N. Young Ave.

Fayetteville, AR 72704

Phone: 479-575-2727 (office); 479-575-3189 (lab)

Contact: Sherrie Smith




Arizona Department of Agriculture

State Agricultural Laboratory

2422 West Holly St.

Phoenix, AZ 85009

Dave Mills – 602-744-4915


Maricopa Agricultural Center, University of Arizona

7860 W. Smith-Enke Road

Maricopa, AZ 85239

insects, urban ecology

Dawn Gouge – 520-381-2223


University of Arizona, Tucson

1140 E. South Campus Drive

Forbes Room 204

Tucson, AZ 85721

fungi, bacteria, nematodes, viruses

Mary Olsen – 520-626-2681
Ursula Schuch – 520-621-1060


Zhongguo Xiong – 520-621-9869


Barry Pryor – 520-626-5312

1140 E. South Campus Drive

Forbes Room 303

Tucson, AZ 85721

viruses, vector biology

Judith Brown – 520-621-1402


Mike McClure – 520-621-7161

1140 E. South Campus Drive

Forbes Room 410

Tucson, AZ 85721


Carl Olson – 520-621-5925


Yuma Mesa Agricultural Center

2186 W. County 15th Street

Somerton, AZ 85350

fungi, bacteria, viruses, nematodes

Mike Matheron – 928-782-5863


Yuma Valley Agricultural Center

6425 W. 8th Street

Yuma, AZ 85364


John Palumbo – 928-782-3836



California Department of Food and Agriculture

Plant Pest Diagnostics Center

3294 Meadowview Road

Sacramento, CA 95832

Attn: Diagnostics

Timothy Tidwell – 916-262-1100



Colorado State University

E215 Plant Sciences Building

Fort Collins, CO 80523-1177

Tamla Blunt – 970-491-6950



Joan Allen

Home & Garden Education Center

Dept. of Plant Science, University of Connecticut

1380 Storrs Rd. U-4115

Storrs, CT 06269-4115

P: 860-486-6740 F: 806-486-6338


Sharon M. Douglas

CT Agricultural Experiment Station

123 Huntington Street, P. O. Box 1106

New Haven, CT 06504-1106

P: 203-974-8496 F: 203-974-8502


Yonghao Li

Same as above

P: 203-974-8601



Nancy Gregory

Plant and Soil Science Dept., U. of Delaware

151 Townsend Hall,

Newark, DE 19717-1303

P: 302-831-1390 F: 302-831-0605



UF Plant Diagnostic Center


Building 1291, 2570 Hull Road


University of Florida


Gainesville FL 32611-0830


(PO Box 110830)


Phone: 352-392-1795



UGA-Plant Pathology Dept.

University of Georgia     

Rural Development Center

P.O. Box 1209

Tifton, GA 31793-1209

Phone: 229-386-7495       Fax: 229-386-7415



College of Tropical Agriculture and Human Resources

Agricultural Diagnostic Service Center – Entomology

3050 Maile Way

Honolulu, HI 96822

Dick Tsuda – 808-956-6742


Agricultural Diagnostic Service Center – Hilo

Komohana Research and Extension Center

875 Komohana St.

Hilo, HI 96720

Brian Bushe – 808-969-5211


Agricultural Diagnostic Services Center – Manoa

College of Tropical Agriculture and Human Resources

1910 East-West Road, Sherman 124

Honolulu, HI 96822

Attn: Desmond Ogata – 808-956-8053


Hawaii Department of Agriculture – Entomology

1428 S. King St.

Honolulu, HI 96814

Bernarr Kumashiro, Insect Taxonomist



Hawaii Department of Agriculture – Plant Pathology

1428 S. King St.

Honolulu, HI 9681

Mann Ko – 808-973-9547


University of Hawaii, Plant Bacteriology Lab

3190 Maile Way

Honolulu, HI 96822

Anne Alvarez, Asoka de Silva – 808-956-8054

Wendy Kaneshiro – 807-956-7764



Idaho Department of Agriculture, Plant Pathology Lab

2230 Old Penitentiary Rd

Boise, ID 83712

Liz Vavricka – 208-332-8640


Idaho State Department of Agriculture, Plant Industry Division/Entomology

2270 Old Penitentiary Rd.

Boise, ID 83712

Ben Simko, Entomologist – 208-332-8620


University of Idaho – Plant Pathology

29603 U of I Lane

Parma, ID 83660

Krishna Mohan, Ramaiah Sampangi – 208-722-6701



Plant and Insect Diagnostic Clinic

Department of Plant Pathology

327 Bessey Hall

Iowa State University

Ames, IA 50011

Phone: (515) 294–0581                                        Fax: (515) 294–9420

Contact: Laura Jesse




(May–Sept) Plant Clinic

1401 W. St. Mary’s Road

University of Illinois

Urbana, IL 61801

Phone: (217) 333-0519

Contact: Suzanne Bissonnette or Stephanie Porter

Email: sbissonn@illinois.eduor


(Sept–Apr) S-420 or S-424 Turner Hall

1102 S. Goodwin Avenue

University of Illinois

Urbana, Illinois 61801

Contact: Suzanne Bissonnette

Phone: (217) 333–2478    Fax: (217) 333–5299


Contact: Stephanie Porter

Phone: (217) 244–3254    Fax: (217) 333–5299




Plant and Pest Diagnostic Laboratory

Purdue University

LSPS 101

915 W. State Street

West Lafayette, IN 47907–2054

Phone: (765) 494–7071    Fax: (765) 494–3958

Contact: Tom Creswell or Gail Ruhl

Email: creswell@purdue.eduOR



Plant Disease Diagnostic Lab

4032 Throckmorton PSC

Manhattan, Kansas 66506

Phone: (785) 532-5810
    Fax: (785) 532-5692



Entomology Diagnostician

Contact: Holly Davis

123 West Waters Hall

Manhattan KS 66506

Phone: (785) 532-4739




Lexington Lab                

Plant Pathology Department

University of Kentucky

210F Plant Science Building

1405 Veterans Drive

Lexington, KY 40546-0312

Phone: 859-257-8949       Fax: 859-323-1961


Princeton Lab                            

Plant Disease Diagnostic Lab

University of Kentucky Research and Education Center

1205 Hopkinsville Street

Princeton, KY 42445-0469

Phone: 270-365-7541 x228           Fax: 270-365-2667



Louisiana State University

302, Life Sciences Bldg.

Baton Rouge, LA 70803

Phone: 225-578-4562                   Fax: 225-578-1415



Rob Wick

Dept. of Plant, Soil & Insect Sciences, UMass

270 Stockbridge Rd, 111 Fernald Hall

Amherst, MA 01003

P: 413-545-1045



M.Bess Dicklow

101 University Drive

Amherst, MA 01003

Phone: 413-545-3209       Fax: 413.545.4385



Karen Rane

Plant Diagnostic Laboratory, University of Maryland

4112 Plant Sciences Building

College Park, MD 20742

Phone: 301-405-1611       Fax: 301-314-9290


David Clement

Maryland Home & Garden Information Center

12005 Homewood Road

Ellicott City, MD 21042

Phone: 410-531-5556       Fax: 401-531-5567



Bruce Watt

Pest Management Office, University of Maine

491 College Ave.

Orono, ME 04473-1295

Phone: 207-581-3883       Fax: 207-581-3881



Diagnostic Services

101 CIPS

Michigan State University

East Lansing, MI 48824–1311


Jan Byrne, Plant Pathologist (517) 355–3504 or

Howard Russell, Entomologist (517) 353–9386 or

Fred Warner, Nematologist (517) 432–1333 or

Fax: (517) 432–0899



Diagnostic Services

Plant Disease Clinic

Department of Plant Pathology

495 Borlaug Hall

1991 Upper Buford Circle

University of Minnesota

St. Paul, MN 55108

Phone: (612) 625–1275    Fax: (612) 625–9728

Contact: Brett Arenz                          


Extension Phone line: (612) 624–4771



Plant Diagnostic Clinic

23 Mumford Hall

University of Missouri

Columbia, MO 65211

Phone: (573) 882–0623    Fax: (573) 884–4288

Contact: Adam Leonberger                      Email:

Nematology Lab Contact: Robert Heinz    Email:



Mississippi State Plant Pathology Lab                   

MES, Box 9655

Mississippi State, MS 39762

Phone: 662-325-2146



Montana State University

119 PlantBioScience Bldg.

Bozeman, MT 59717-3150

Linnea Skoglund – 406-994-5150

Ruth O’Neill, Melissa Graves – 406-994-5690


Schutter Diagnostic Lab, Montana State University

121 Plant Bio Science Bldg,

Bozeman, MT 59717-3150

Mary Burrows, Lab Supervisor – 406-994-7766


North Carolina       

Plant Disease and Insect Clinic

Campus Box 7211

1104 Williams Hall

100 Derieux Place

North Carolina State University

Raleigh, NC 27695-7211

Phone: 919-515-3619


North Dakota       

North Dakota State University

NDSU Plant Diagnostic Lab

306 Walster Hall

Fargo, ND 58102

Phone: (701) 231-7854




University of Nebraska-Lincoln

Plant and Pest Diagnostic Clinic

448 Plant Sciences

P.O. Box 830722

Lincoln, NE 68583-0722

Phone: (402) 472-2858
Fax: (402) 472-2853


New Hampshire         

Cheryl Smith

Plant Diag. Lab. University of New Hampshire,

G37 Spaulding Hall, 38 Academic Way

Durham, NH 03824

Phone: 603-862-3841       Fax: 603-862-2717


New Jersey        

Rich Buckley

Plant Diagnostic Laboratory, Rutgers University

P.O. Box 550

Milltown, NJ 08850

Phone: 732-932-9140       Fax: 732-932-1270


Sabrina Tirpak

Same as above


New Mexico       

New Mexico State, Plant Diagnostic Clinic NMSU-CES

Box 30003, MSC 3AE

Las Cruces, NM 88003

Natalie Goldberg, Jason French – 575-646-1965



Nevada Department of Agriculture – Plant Pathology Lab

405 South 21st Street

Sparks, NV 89431

Shouhua Wang – 775-353-3765


Nevada Department of Agriculture, Entomology Lab

405 South 21st Street

Sparks, NV 89431

Jeff Knight – 775-353-3767


New York        

Sandra Jensen

Cornell Plant Disease Diagnostic Clinic

334 Plant Science Building

Ithaca, NY 14853

P: 607-255-7860


Insect Diagnostic Laboratory
Cornell University
Dept. of Entomology
2144 Comstock Hall
Ithaca, NY 14853-2601
Insect Diagnostic Laboratory
Cornell University
Dept. of Entomology
2144 Comstock Hall
Ithaca, NY 14853-2601

Insect Diagnostic Laboratory

Cornell University

Dept. of Entomology

2144 Comstock Hall

Ithaca, NY 14853-2601


Long Island Hort. Research & Exten. Center

3059 Sound Ave

Riverhead, NY 11901

P: 631-727-3595 F: 631-727-361

Margery Daughtrey


Meg McGrath

Address same as above

P: 631-727-3595


Laura Hunsberger

Address same as above



C. Wayne Ellett Plant and Pest Diagnostic Clinic

8995 East Main Street

Plant Industry Building, #23

The Ohio State University

Reynoldsburg, OH 43068

Phone: (614) 292–5006                Fax: (614) 466–9754

Contact: Nancy Taylor                           

Email: or



Oklahoma State University

Entomology & Plant Pathology

127 Noble Research Center

Oklahoma State University

Stillwater, OK 74078-3033

Rick Grantham – 405-744-9417



Oregon Department of Agriculture, Plant Health Lab

635 Capital Street NE

Salem, 97301

Shawn Meng – 503-986-4661


Oregon State University – Plant Clinic

1089 Cordley Hall

2701 SW Campus Way

Corvallis, OR 97331

Melodie Putnam – 541-737-3472



Sara May

Penn State University

220 Buckhout Lab

University Park, PA 16802

P: 814-865-2204 F: 814-863-7217


Seong-Hwan Kim

Plant Disease Diagnostic Lab

Pennsylvania Department of Agriculture

2301 N Cameron St

Harrisburg, PA 17110

P: 717 772 5224 L: 717 772 5221: F: 717 705 6518


Rhode Island         

Heather Faubert

Plant Protection Clinic, U. of Rhode Island

Mallon Outreach Center, 3 E. Alumni Ave.

Kingston, RI 02881

P: 401-874-2967 F: 401-874-2259


South Carolina        

Plant Problem Clinic

Clemson University

511 Westinghouse Rd.

Pendleton, SC 29670

Phone: 864-656-2677       Fax: 864-646-2137


South Dakota        

Plant Diagnostic Clinic

South Dakota State University

1205 Jackrabbit Drive

Box: 2108

Brookings, SD 57007

Phone: 605.688.5545       Fax: 605.688.4024




UT Agricultural Extension Service

University of Tennessee

5201 Marchant Drive

Nashville, TN 37211-5201

Phone: 615-835-4572       Fax: 615-832-0043



Texas Plant Disease Diagnostic Laboratory

Texas A&M University

1500 Research Parkway, Suite A-130

College Station, TX 77845

Phone: 979-845-8032       Fax: 979-845-6499




Utah State University

5305 Old Main Hill

Logan, UT 84322

Ryan Davis, Entomology

Phone: 435-797-2435



Plant Disease Clinic and Nematode Assay Lab

106 Price Hall

Department of Plant Pathology, Physiology and Weed Science

Virginia Polytechnic and State University

Blacksburg, VA 24061-0331

Phone: 540-231-6758       Fax: 540-231-3221



Ann Hazelrigg

University of Vermont

Jeffords Hall, 63 Carrigan Drive

Burlington, VT 05405

P: 802-656-0493 F: 802-656-4656



Washington Department of Agriculture

Pest Program / Plant Protection Division Entomology

P.O. Box 42560

Olympia, WA 98504

Eric LaGasa, Chief Entomologist

Phone: 360-902-2063


Washington Depart. of Agriculture – Plant Pathology Lab

3939 Cleveland Ave SE

Olympia, WA 98501

Jennifer Falacy


WSU Puyallup Research and Extension Ctr. (western WA)

7612 Pioneer Way East

Puyallup, WA 98371

Jenny Glass


WSU Plant & Pest Diagnostic eNetwork (eastern WA)

P.O. Box 646430

Pullman, WA 99164-6430

Karen F. Ward

Phone: 509-335-3292



Plant Disease Diagnostics Clinic

Department of Plant Pathology

1630 Linden Drive

University of Wisconsin-Madison

Madison, WI 53706–1598

Phone: (608) 262–2863                                        Fax: (608) 263–2626

Contact: Brian Hudelson                         




Jennifer Williams

West Virginia University Extension Service

2080 Agricultural Sciences Building

P.O. Box 6108

Morgantown, WV 26506-6108

P: 304-293-6131

Berry A. Crutchfield

Pest Identification Laboratory

West Virginia Dept. of Agriculture

1900 Kanawha Blvd. E.

Charleston, WV 25305

P:304-558-2212 F:304-558-2435



University of Wyoming

1000 E. University Ave.

Laramie, WY 82071

Gary Franc – 307-766-2397



Pest Diagnostic Clinic

Laboratory Services

University of Guelph

95 Stone Road West

Guelph, Ontario, Canada N1H 8J7

Phone: (519) 767–6299                                        Fax: (519) 767–6240



National Plant Diagnostic Network (NPDN) website Laboratories (listed by State at bottom of page)