It is very helpful to know where information can be obtained to diagnose and learn more about plant diseases.

Penn State Publications

Penn State Publication Distribution Office, 112 Ag. Admin. Bldg., University Park, PA 16802

• Disease and arthropod management in greenhouses.
  This guide covers the biology of the pests and diseases and lists specific chemical and nonchemical control recommendations.

Pennsylvania Department of Agriculture Publication

• Regulatory Horticulture. Commonwealth of Pennsylvania, Pennsylvania Department of Agriculture, 2301 N. Cameron St., Harrisburg, PA 17110

General Plant Pathology References

• Trigiano, R. N., Windham, M. T., and Windham, A. S. Plant Pathology concepts and laboratory exercises. 2 ^nd Ed. CRC Press, Boca Raton. 558 pp.
• Agrios, G. N. 1997. Plant pathology. Academic Press, New York. 635 pp.
• Barnett, H. L. and B. B. Hunter. 1998. Illustrated genera of imperfect fungi. APS Press. 3340 Pilot Knob Rd., St. Paul, MN 55121 (1-800-328-7560) (For use if you have a microscope.)

Herbaceous Plant Disease References

• Gleason, M. L., Daughtrey, M. L., Chase, A. R., Moorman, G. W., and Mueller, D. S. 2009. Diseases of herbaceous perennials. APS Press, St. Paul, MN. 281 pp (over 700 color photographs).
• Forsberg, J. L. 1979. Diseases of ornamental plants. Special Publication No. 3. University of Illinois at Urbana-Champaign. 222 pp.
• Pirone, P. P. 1978. Diseases and pests of ornamental plants. John Wiley & Sons, NY. 566pp.
• Diseases of Floral Crops. 1985. D. L. Strider, editor. Praeger Publishers, 521 Fifth Ave., New York, NY 10175. Volumes I, 638 pages and II, 579 pages.
• APS Press, 3340 Pilot Knob Rd., St. Paul, MN 55121 (1-800-328-7560; http://www.shopapspress.org/)
• Jarvis, W. R. 1992. Managing diseases in greenhouse crops. APS Press, St. Paul, MN. 288 pp.

Compendia Of Diseases Of

• Flowering Potted Plants
• Rose Diseases
• Ornamental Foliage Plants
• Chrysanthemums
• Rhododendron and azaleas
• Ornamental Palm Diseases and Disorders

CDs of the photos found in these compendia can be purchased also.

Internet References

• Penn State Extension Plant Diseases
  
• Ohio State University
• American Phytopathological Society

Plant Disease Clinics

Pennsylvania

Plant Disease Clinic
Penn State University, Dept. of Plant Pathology
218 Buckhout Lab
University Park, PA 16802-4507

Obtain a diagnosis form and envelop from your County Cooperative Extension office. Fill in the form and mail the sample on a day when it will reach University Park promptly without sitting in a post office over a weekend. Or, send the sample via overnight delivery service. General diagnoses are done at no charge. If forwarded to a commercial lab for virus or other specialized testing, the cost of that testing is passed on to the client.

Pennsylvania Department of Agriculture
Bureau of Plant Industry
2301 N. Cameron St.
Harrisburg, PA 17120.

Contact your local nursery inspector for a diagnosis or to have a sample submitted to the lab.

New York

Plant Disease Diagnostic Lab
321 Plant Science Building
Dept. PPATH
Cornell University
Ithaca, NY 14853-4203
Phone: 607-255-7850

All samples require a fee for processing.

New Jersey

• Rutgers Plant Diagnostic Laboratory and Nematode Detection Service

Samples Can Be Mailed To

Plant Diagnostic Laboratory
Rutgers Cooperative Extension
P. O. Box 550
Milltown, NJ 08850-0550

Delivery Services Should Go To

Plant Diagnostic Laboratory
Rutgers Cooperative Extension
Bldg. 6020, Dudley Road
Cook College
New Brunswick, NJ 08903

All samples require a fee for processing.

Ohio

The C. Wayne Ellett Plant and Pest Diagnostic Clinic
2021 Coffey Rd.
Room 110, Kottman Hall
The Ohio State University
Columbus, Ohio 43210

All samples require a fee for processing.

Maryland

Maryland Cooperative Extension Plant Diag. Lab
Department of Entomology
University of Maryland
College Park, MD 20742

All samples require a fee for processing.

The Maryland Department of Agriculture has both entomology and pathology labs that support the state nursery inspection program.

West Virginia

* Plant Disease Diagnostic Clinic 304-293-3911
401 Brooks Hall, Downtown Campus
West Virginia University
Morgantown, WV 26506

Samples are generally submitted through a county agent but can be sent directly to the clinic at no charge.

Commercial Diagnostic Services and Diagnostic Kits

(contact each to determine what tests are available and the cost per test)

Agdia, Inc. 1-800-622-4342
30380 County Road 6
Elkhart, IN 46514
E-mail: [email protected]

Samples are tested or the client can purchase kits to do virus and bacteria diagnoses.

Hydros, Inc.
230 Jones Road
Falmouth, MA 02540
Phone: 508-540-2229
E-mail  [email protected]

Can purchase kits to do virus and bacteria diagnoses.

Diagnosis Equipment and Supplies

Magnifying glasses, pH meters, conductivity meters, field microscopes:

Cole-Parmer Insturment Co
625 East Bunker Court
Vernon Hills, IL 60061-1844
Phone: 1-800-323-4340

Magnifying glasses, pH meters, conductivity meters, field microscopes, clipboards, GPS instruments, pruning equipment, increment borers, mapping and data recording supplies, plant presses for drying plant specimens, Riker mounts for displaying flat specimens:

Forestry Supplies, Inc.
P.O. Box 8397
Jackson, MS 39284-8397
Phone: 1-800-647-5368
Phone: 1-800-241-6401

Pesticide Reference Manual

Farm Chemicals Handbook

Meister Publishing Co.
37733 Euclid Avenue
Willoughby, OH 44094-5992
Phone: 216-942-2000
E-mail: [email protected]

Penn State Course

PPATH 300, Diseases of Horticultural Crops, is a completely online 3 credit course available through Penn State University during the Fall semester each year.