Extension Search / Diagnostic Labs
Most states have a university lab that will look at a sick plant, an insect or a weed and tell you what it is. They are run by Cooperative Extension and usually charge a small fee. Enter your ZIP code to put the closest lab first, or pick a test to see which labs run it.
Tests
No lab offers every test you picked. Try fewer.
No lab is listed here yet for these states and territories. Your local Extension office can tell you where to send a sample.
The National Plant Diagnostic Network lists every member lab, including state agriculture department labs.
Bizon is an independent business and isn’t affiliated with or endorsed by any university or Extension service. Lab details were checked against each lab’s own site in October 2026. Why Bizon supports Extension.
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