Insect Identification


Agricultural Commissioner Sealer of Weights and Measures

Greg Clark 1

Insect Identification 

The Napa County Agricultural Commissioner’s Office welcomes submissions of insects for identification that are associated with commercial agriculture or from home and garden settings.  To a limited extent, we will also assist pest control industry representatives with insect identification.

Samples we do not take: vacuum cleaner debris, skin, hair, clothing, or animal waste.  If you have any concerns about your skin or human health as it relates to insects, please visit your doctor.

Insect collection and sample submission:

Please bring samples that are fresh and intact for identification.

  1.  All samples must arrive in a sealed container: sealed bag, jar or plastic container. Avoid submitting samples on tape, or samples which have been damaged.
  2. Insect samples must be dead unless they are in the larval (caterpillar) or pupal (cocoon) stages. Place the sample in the freezer overnight before bringing it to the office.
  3. Please complete a sample submission form.   
  4. We do not typically identify insects from photographs.
  5. We will contact you within two weeks of the submission with information on the insect.


The Napa County Mosquito Abatement District is an additional resource for insect identification.  The District has three entomologists on staff and has expertise in identifying mosquitoes, wasps, flies, ticks, bedbugs, roaches, and other insects.  The District can be contacted at (707) 553-9610 and samples can be brought to their office at 15 Melvin Road, American Canyon.  Insect sample submissions must follow the same basic protocols as outlined above