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Potato cyst nematode

U.S. effort to eradicate nematode potato pest succeeding

Progress is being made eradicating a microscopic pest that has been threatening Idaho’s $900 million potato industry the last decade, federal officials say.

Pale Cyst Nematode (PCN) Eradication Progress Summary (Idaho) as of March 2017.

The U.S. Department of Agriculture said viable potato cyst nematodes can no longer be detected in three additional fields. The agency on Friday released the first quarter report for 2017 on the Pale Cyst Nematode Eradication Program that said 20 of the 27 infected fields have now reached that step in a lengthy process to return to production.

About 9,300 acres are being regulated because of the pest in southeastern Idaho. Canada, Mexico and Korea initially banned Idaho potatoes when the pests were discovered in 2006, and Japan banned all U.S. potatoes. Japan still bans Idaho potatoes.

The report stated that extensive surveys have not found the pale cyst nematode, or PCN, in Idaho beyond the 27 confirmed fields. “The general opinion by our trading partners is that potatoes produced outside regulated areas do not pose the biological risk for introduction of PCN,” the report stated.

Nematodes feed on potato roots and can reduce crop production by 80 per cent, but experts say they aren’t harmful to humans. Idaho produces about 30 per cent of the U.S. potato crop.

There are two related fronts involving nematodes: A federal lawsuit filed by farmers seeking to have their fields removed from a federal quarantine continues to work its way through the court after a judge denied the government’s request to dismiss the case. Also, a supplemental environmental impact statement currently in a comment period lists as the preferred alternative for dealing with the nematodes one that doesn’t use methyl bromide. The chemical treatment, which was stopped in 2014, has been highly effective at killing nematodes but concerns have been raised that it has sickened livestock.

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