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In 2016 Cornell’s Plant Disease Diagnostic Clinic identified the pathogen that causes Oak Wilt in two new locations in New York State.

On 12-12-17, the NYSDEC announced the discovery of two new oak wilt locations in Glenville NY. For more information on Oak Wilt, please see our “Oak Wilt” page for more information. To learn more about the steps being taken to try to prevent the spread of the pathogen and to try to eradicate it from existing sites, please see the "NYSDEC Oak Wilt" webpage.

In 2016 the soybean cyst nematode was detected in a soybean field in New York State. Go to the “Soybean Cyst Nematode” link for more information.

Clinic fees effective August 1, 2017. Please go to the "Fees" link to see the current fee schedule and all the services offered.”

The Plant Disease Diagnostic Clinic is a facility of the Section of Plant Pathology and Plant-Microbe Biology within the School of Integrative Plant Science at Cornell University. The Clinic provides fast and accurate plant disease diagnosis and up-to-date pest control recommendations for anyone from home owners to commercial growers. Services include analysis of plant material and soil for bacterial, fungal, viral, and nematode pathogen.


The Clinic promotes a "Test, Don't Guess" attitude. This is because we feel that knowing the pest affecting your plants and crops prior to treatment is essential for the best chances of recovery. The "Test, Don't Guess" policy allows for the appropriate selection and efficient use of control methods.

When sending a sample to the laboratory please include a Sample Submission Form. Please follow our collection tips when submitting samples! A sample that is improperly collected, packed, and/or shipped and arrives in poor shape is very difficult to diagnosis.

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Under the Scope

Weekly Diagnostic Review Reports are available here, and Feature Archives can be accessed here.

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Comprehensive collection of plant pest factsheets.

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