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How to Have a Pest or Plant Disease Identified

Do not drop off diseased plant material or insects at South Coast Research and Extension Center.  The Orange County Extension Office does not take samples for identification.

The Orange County Agricultural Commissioner can help with identifying plant diseases and plant pests.  Their website has instructions for preparing a specimen.

Lab Services and Specimen Identification

Specimens can be dropped off at:

Agricultural Commissioner's Office
Orange County
222 E. Bristol Lane
Orange, CA 92865-2714
Telephone (714) 955-0100
Fax (714) 921-2713


The Agricultural Commissioner's office no longer has a resident entomologist.  Pest samples submitted to this office are now being sent up to Sacramento for identification, so the response time may increase significantly. The local office is no longer able to answer phone questions about the status of a pest submittal. 

 Orange County Mosquito and Vector Control can identify insects samples (no live specimens).

Their website has instructions for insect identification. 

Insect Identification (OC Mosquito and Vector Control)

Orange County Mosquito and Vector Control District
13001 Garden Grove Blvd
Garden Grove, CA 92843
Main line: (714) 971-2421 or (949) 654-2421
Fax (714) 971-3940