08/21/2026
Potato Nematode Q&A
We asked what questions you have about potato nematodes — here are the highlights (see more detailed answers in the pictures).
What are effective alternatives to fumigation for managing nematodes?
While no single alternative replaces fumigation entirely, combining several tools in an IPM program can significantly reduce their use.
Why are some potato nematodes regulated?
Regulatory status for plant pests in the U.S. is determined by USDA-APHIS based on factors including geographic distribution, economic impact, pest biology, and the feasibility of eradication or containment.
How do I know if nematodes are causing problems in my fields?
The only reliable way to know if nematodes are the cause is through soil sampling and analysis through a nematode diagnostic laboratory, which you can find here: PotatoNematodes.org/diagnostic-labs.
How do I sample for nematodes?
To determine the number of samples to collect and where to collect them, work with a nematologist or diagnostician who can account for field-specific factors. See sampling recommendations from a nematologist here: PotatoNematodes.org/build-a-smarter-nematode-sampling-program-for-better-management.
What are the costs of nematode management?
On average, nematode control costs U.S. farmers $500 to $700 per acre in additional chemical costs and increased harvest, storage, application, and operating costs. Read more about the economics of potato nematodes at PotatoNematodes.org/500-per-acre-the-real-costs-of-potato-nematodes.
Which varieties are resistant to nematodes?
For golden cyst nematode, many U.S. varieties carry resistance. For pale cyst nematode and root-knot nematodes, commercially available resistant varieties don’t exist for most U.S. market classes. See a list of nematode-resistant varieties: PotatoNematodes.org/closing-the-gap-in-nematode-resistant-potato-varieties.
Have more questions? Leave them in the comments, send us a message, or visit PotatoNematodes.org to explore our full library of nematode resources.
