Plant and Pest Diagnostic Clinic

Due to COVID-19, our laboratory building is closed to the public until further notice and staff are working under a modified operation status.  Diagnosticians for the Plant and Pest Diagnostic Clinic labs continue to process samples, but hours in the lab are limited per State mandate. All staff remain available during work hours via email and voicemail. Please be patient as you may experience slightly longer response times.

Samples from agricultural and other commercial growers and clients will be prioritized over residential samples. Residential clients are encouraged to initially send (at no charge) photographs of unhealthy plants, plant pests, or plant/weed identifications to our diagnostician, Meg Williamson, at If an identification cannot be made from photographs, the residential client may then send a physical sample to the lab, which will be charged the usual sample fee. 

Samples may be shipped to our building via UPS, FedEx, and USPS. Please limit weight of packages to 10 pounds or less. We are here to receive packages Monday - Friday, excluding holidays. Samples may also be dropped off at our building’s drop box located at our rear loading dock, which also houses sample forms, bags, and other supplies. Please notify Lab Coordinator Diana Low ( or (864) 646-2133) when a sample is placed in the drop box.

We thank you for your understanding of our compliance with these important public health measures mandated by the State of South Carolina and Clemson University.

The Clemson University Plant and Pest Diagnostic Clinic is a multi-disciplinary program which provides diagnoses and management recommendations for plant and turf problems, which include diseases, nematodes, weeds, environmental issues, nutritional deficiencies and insect pests of plants.  We also identify insects infesting structures, humans, pets and livestock.  

The Plant and Pest Diagnostic Clinic receives samples from the Clemson University Cooperative Extension Service offices, homeowners, growers, landscapers, turfgrass management professionals and researchers. Our diagnosticians work closely with Clemson University specialists to provide management recommendations.  As a part of Clemson University Regulatory Services, we also help to detect and document new plant diseases and pests in South Carolina.

Samples may be submitted through the County Extension offices or directly to the laboratory. Each location has the supplies needed for submitting samples.  Sample submission forms may be found in the right-hand column of this page.  Our laboratories include the Plant and Pest Diagnostic Clinic, Nematode Assay Lab, Commercial Turfgrass Clinic and MPPD Lab.  Our laboratory address is:

Clemson University
Plant and Pest Diagnostic Clinic
511 Westinghouse Road
Pendleton, SC 29670

(864) 646-2133

Laboratory hours are Monday - Friday, 8:00 a.m. - 4:30 p.m.
(closed during lunch hour, noon - 1:00 p.m.)