Soil and Plant Testing Labs in California 2026

COMMERCIAL PLANT AND SOIL LABORATORIES IN CALIFORNIA - 2026

This list was compiled by the Plant Pathology and Nematology Program Team in August 2026 as a resource for the California agricultural community. It includes laboratories known to provide plant pathology and nematology diagnostic services, and in some cases, additional services such as plant and soil nutrient analyses and herbicide residue testing. Every effort was made to identify and include laboratories currently offering these services; however, this list may not be exhaustive. If you are aware of a laboratory that should be added, if any information requires correction, or if a laboratory wishes to be removed from future versions of this list, please send an email to ampastranaleon@ucanr.edu.

The inclusion of a laboratory in this list does not constitute an endorsement by the University of California or the Plant Pathology and Nematology Program Team.

NORTHERN CALIFORNIA

Agri-Analysis LLC City: Davis, CA

Phone: (800) 506-9852

Website: agri-analysis.com Plant pathogens: Yes Nematode testing: No Nutrient testing: No Herbicide testing: No

AL & L Crop Solutions City: Vacaville, CA Phone: (530) 387-3270

Website: allcropsolutions.com Plant pathogens: Yes Nematode testing: Yes Nutrient testing: No Herbicide testing: No

Alluvial Soil Lab

City: Santa Cruz, CA

Phone: (831) 216-1367

Website: alluvialsoillab.com Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: Yes (limited)

CSP Labs (California Seed & Plant Lab) City: Pleasant Grove, CA

Phone: (916) 655-1581

Website: csplabs.com Plant pathogens: Yes Nematode testing: Yes Nutrient testing: No Herbicide testing: No

Foundation Plant Services (FPS) – University of California, Davis City: Davis, CA

Phone: (530) 752-3590

Website: https://fps.ucdavis.edu/custommain.cfm

Plant pathogens: Yes Nematode testing: No Nutrient testing: No Herbicide testing: No

Notes: Specializes in disease-tested plant propagation material, plant importation and quarantine, virus testing and elimination, and DNA-based plant identification

Microbac

City: Arcata, CA

Phone: (707) 822-4649

Website: microbac.com Plant pathogens: No Nematode testing: No Nutrient testing: No Herbicide testing: Yes

Sunland Analytical

City: Rancho Cordova, CA

Phone: (916) 852-8557

Website: sunland-analytical.com

Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: No

CENTRAL CALIFORNIA

AEMTEK AgLab

City: Several locations, CA

Phone: (510) 979-1979

Website: aemtek.com Plant pathogens: Yes Nematode testing: Yes Nutrient testing: Yes Herbicide testing: Yes

Ag Laboratory & Consulting City: Santa Maria, CA Phone: (805) 739-5333

Website: aglaboratory.com Plant pathogens: Yes Nematode testing: Yes Nutrient testing: Yes Herbicide testing: No

California Agri Diagnostics LLC (PlantPathLab) City: Stockton, CA

Phone: (209) 502-4670

Website: plantpathlab.com Plant pathogens: Yes Nematode testing: Yes Nutrient testing: No Herbicide testing: No

Control Laboratories City: Watsonville, CA

Phone: (831) 724-5422

Website: controllabs.net Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: No

Crop Doctor Lab

City: Arroyo Grande, CA

Phone: (805) 927-7707

Website: cropdoctor.net

Plant pathogens: Yes Nematode testing: Yes Nutrient testing: No Herbicide testing: No

Dellavalle Laboratory City: Fresno, CA Phone: (800) 228-9896

Website: dellavallelab.com Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: No

Denele Analytical

City: Turlock, CA / Arbuckle, CA

Phone: (209) 634-9055 / (530) 666-9056

Website: denelelabs.com Plant pathogens: Yes Nematode testing: Yes Nutrient testing: Yes Herbicide testing: No

EMA Labs (Environmental Micro Analysis) City: Woodland, CA

Phone: (530) 666-6890

Website: emalab.com Plant pathogens: No Nematode testing: No Nutrient testing: No Herbicide testing: Yes

JM Lord, Inc.

City: Fresno, CA

Phone: (559) 268-9755

Website: jmlordinc.com Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: No

Nematodes, Inc. (also listed as Nematodes Limited) City: Selma, CA

Phone: (559) 891-9073

Website: No public website — contact: nema@msn.com

Plant pathogens: Yes Nematode testing: Yes Nutrient testing: No Herbicide testing: No

Pacific Agronomics (also known as VPN Laboratory) City: Fresno, CA

Phone: (559) 276-0403

Website: pacificagronomics.com/vpnlab.html

Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: No

Perry Laboratory

City: Watsonville, CA

Phone: (831) 722-7606

Website: perrylaboratory.com Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: No

Precision Agri-Lab City: Madera, CA

Phone: (559) 661-6386

Website: precisionagrilab.com Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: No

Sunburst Agri Biotech Solutions City: Turlock, CA

Phone: (209) 667-4442

Website: sunburstabs.com

Plant pathogens: Yes

Nematode testing: Yes Nutrient testing: No Herbicide testing: No

TriCal Diagnostics City: Hollister, CA

Phone: 831-630-2240

Website: tricaldiagnostics.com Plant pathogens: Yes Nematode testing: Yes Nutrient testing: No Herbicide testing: No

Valley Tech Agricultural Laboratory Services City: Tulare, CA

Phone: (559) 688-5684

Website: valleytechaglab.com Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: No

Ward Laboratories, Inc.

City: Kearney, NE (National Mail-in)

Phone: (308) 234-2418

Website: wardlab.com Plant pathogens: No Nematode testing: Yes Nutrient testing: Yes Herbicide testing: No

Wonderful Laboratories LLC City: Shafter, CA

Phone: (661) 337-9072

Website: wonderfullaboratories.com

Plant pathogens: Yes Nematode testing: No Nutrient testing: Yes Herbicide testing: No

SOUTHERN CALIFORNIA

AGQ Labs USA City: Oxnard, CA

Phone: (805) 981-2972

Website: agqlabs.us.com Plant pathogens: No Nematode testing: No Nutrient testing: Yes Herbicide testing: Yes

Fruit Growers Laboratory (FGL)

City: Santa Paula, CA (HQ) + Visalia, Chico, Stockton, San Luis Obispo

Phone: (805) 392-2000 (HQ)

Website: fglinc.com Plant pathogens: Yes Nematode testing: Yes Nutrient testing: Yes Herbicide testing: No

Plant Pulse Diagnostics City: Anaheim, CA Phone: (657) 631-2463

Website: plantpulsediagnostics.com Plant pathogens: Yes

Nematode testing: No Nutrient testing: Yes Herbicide testing: No

PrimusLabs

City: Santa Maria, CA

Phone: (805) 922-0055

Website: primuslabs.com Plant pathogens: No Nematode testing: No Nutrient testing: No Herbicide testing: Yes

Wallace Laboratories City: El Segundo, CA Phone: (310) 615-0116

Website: wlabs.com