Late Blight Sample Collection and Submission to Cornell
Margie Lund, Extension Vegetable Specialist
Cornell Vegetable Program
If late blight is detected or suspected on your farm, and you cannot get a sample to a Cornell Vegetable Program staff member in a day or two, you should submit your sample to Chris Smart's lab at Cornell. Following are instructions for reporting, collecting and mailing samples to his lab.
From usablight.org:
Samples must be reported online and a form that is generated from your submission must be included with the sample. You will receive a sample number (which should be written on the sample bag when it is sent to the lab), and this number can be used to track your sample.
Report online and fill out a form. (If you are new to the system you must Register for Sample Submission BEFORE Reporting.)
When sending late blight samples it is better to send leaf tissue rather than fruit or tubers. If you do send fruit or tubers send them in a separate bag or shipment -- so they do not crush the leaf tissue in transit. What to send:
1. A minimum of 5 fresh turgid leaves with actively sporulating lesions. Smaller lesions are best. Collected from several locations when possible.
2. Place the foliage in an air-tight dry plastic (Ziploc) bag with a cushion of air - so the foliage doesn't get crushed. Use a small shipping box rather than an envelope. PLEASE write the sample number on the bag.
3. Send the sample immediately upon collection. If you must "hold" the sample overnight, keep it at 40 - 50 F.
4. Include the completed sample submission form (see instructions for reporting sample online) in the box with the sample.
5. Mail the sample via overnight mail to:
Cornell AgriTech
Attn: Colin Day / Chris Smart
630 West North St, Barton Laboratory
Geneva, NY 14456
E-mail: cds14@cornell.edu
Phone: 315-787-2441
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Upcoming Events
Good Agricultural Practices (GAPs) Food Safety Training
March 10, 2026
Newark, NY
Learn about food safety on the farm! This event hosted by the Cornell Vegetable Program, Cornell Lake Ontario Fruit Team, CCE Wayne County, and the NYS Department of Agriculture, will cover good agricultural practices (GAPs) to help reduce the risk of microbial contamination on the farm, keeping food and consumers safe.
Urban Ag Food Safety Webinar
March 11, 2026
Urban and small-scale producers are encouraged to join us for the Urban Ag Food Safety webinar, featuring speakers from Cornell Cooperative Extension and Cornell IPM. We will explore the 'why' behind food safety, providing a basic overview and diving into specific urban ag considerations including water, pest, rodent, and soil health challenges. We will touch on the regulation and marketing landscape, and share resources for learning more. Bring your questions!
2026 NYS Processing Vegetable Educational Meeting
March 16, 2026
Batavia, NY
Processing vegetable industry members who grow, manage, or support crop production for Farm Fresh First/Nortera Foods, Seneca Foods and/or Love Beets, are encouraged to sign-up for the 2026 NYS Processing Vegetable Industry Meeting! You will:
- Network at this in-person meeting.
- Learn the results of industry-funded research.
- Have a voice in Cornell research and Extension.
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