North American Certified Seed Potato Health Certificate (NACSPHC)
Carol MacNeil, Extension Vegetable Specialist
Cornell Vegetable Program
About 20% of the PVY in the North American seed crop is currently PVYntn. 25% incidence of TNRD occurred in a local grower's crop from one field, resulting in very high losses. It is reported as "Mosaic" on the certificate, which includes all the PVY strains. Only buy seed lots with a very low percent of mosaic. Aphids can spread the disease from a non-necrotic ringspot susceptible "carrier" to a susceptible variety on your farm. From Meg McGrath, 8/25, Long Island Fruit & Vegetable Update - Brown leaf spots and necrotic leaf veins in the early, European variety Nadine this season were confirmed to be caused by PVYNTN. See photos of these leaves and of a plant with more typical mild symptoms, plus information about PVY. Also see images of the brown necrotic ringspots on tubers of a susceptible variety. In other varieties PVYntn only reduces yield, causing plants to produce fewer and smaller tubers. Read about varietal susceptibility to TNRD.
Common bacterial blackleg and the new, much more virulent bacterial blackleg Dickeya (BBD) aren't distinguished on the NACSPH Certificate, but are reported as "Blackleg" at this time. About 30% of potato stems in one local field wilted and died from BBD in 2015. Four fields were confirmed positive in the CVP region in 2016, and more fields were suspected. Plant pathologists are recommending that growers adopt 0% tolerance for blackleg in their seed. If any BBD was seen in a field this year check carefully for rotting tubers and the "shells" of tubers that already rotted, before harvest. Also note if yield was less than expected. 2016 incidence of BBD in Eastern and some Midwestern fields were traced to 11 ME seed producers and 2 New Brunswick, Canada, producers, of Reba, Superior, Vivaldi, Norwis, Snowden, Yukon Gold, Beacon Chipper, Kennebec and Atlantic.
North American Certified Seed Potato Health Certificate (SAMPLE) (pdf; 469KB)
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Upcoming Events
Vegetable Pest and Cultural Management Field Meeting for Auction Growers -- Ontario Produce Auction
July 15, 2025
Stanley, NY
This evening meeting will demonstrate pest management in fresh market vegetables in both field and greenhouse (high tunnel) vegetables, primarily for those growing for wholesale auction. A hands-on demonstration of weed, insect and disease identification in vegetables including management options. Details on each topic will focus on field observations at the farm.
Orleans Summer Vegetable Meeting, 2025
July 16, 2025
Waterport, NY
Meeting themes are pest management in a wide array of produce and best practices for pesticide use. Professor Brian Nault will cover allium leaf miner and thrips in onions, garlic, and leeks, and discuss insect challenges in other crops. Bring your questions! We'll also have a field walk that includes high tunnel tomato and cucumber.
DEC credits available: 0.5 in CORE plus either 1.25 in 1a and 23, or 0.75 in 24.
Vegetable Pest and Cultural Management Field Meeting for Auction Growers -- Finger Lakes Produce Auction
July 18, 2025
Penn Yan, NY
This evening meeting will demonstrate pest management in fresh market vegetables in both field and greenhouse (high tunnel) vegetables, primarily for those growing for wholesale auction. A hands-on demonstration of weed, insect and disease identification in vegetables including management options. Details on each topic will focus on field observations at the farm.