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Moth forces wine country’s secret into the open

FRESNO, Calif. (AP) — One of the dirty secrets of California’s wine country is now on everyone’s lips.

Somehow, a voracious grape-eating moth has found its way nonstop from Europe to the heart of the Napa Valley, the land of three-figure cabernet. With valuable fruit at risk, the region’s fast and loose play with federal agriculture quarantine laws is getting new scrutiny from investigators and researchers.

Suitcase smuggling is the winked-at act of sneaking in cane cuttings to clone vines from France’s premier vineyards, hoping to replicate success. Vintners say it helped build a handful of exceptional vineyards in the 1980s when U.S. plant choices were limited and import testing took seven years.

As California clamps a quarantine across the heart of Napa Valley and farmers ready their pesticides, nobody is winking anymore. A new Napa reality is setting in— that lax attitudes invite costly invasions of new pests that can threaten the country’s most expensive and economically-productive farmland.

‘‘There are people who continue to spin their tales of smuggled plant material. People like a story with a glass of wine, and what that tends to do is legitimize behavior that not only threatens the industry, it’s illegal,’’ said Greg Clark, deputy agricultural commissioner for Napa County. ‘‘Knock it off.’’

A handful of California’s best vintners today admit to having used ‘‘suitcase cloning’’ to avoid yearslong waits in USDA quarantine for their vines.

Their stories of success after stuffing cane buds down pants legs and in backpacks romanticized an outlaw behavior that, even if it’s not directly responsible for a coming wave of vineyard spraying over most of Napa Valley, has reminded growers that one person’s miscalculation can affect them all.

‘‘The question is, ‘Who brought it in?’’’ asks Jim Lincoln, who manages 400 acres of grapes in the quarantine area.

Theories are swirling around Napa like cabernet in a Riedel glass: smuggled grape cuttings, imported vineyard machinery mislabeled to avoid scrutiny, as is suspected in Chile’s similar outbreak, or, even more sinister, a deliberate introduction to gain an edge in a region where an acre of fruit can sell for $15,000 and more.

‘‘Even small percentage or a fraction of a percentage in market share has the potential to benefit someone financially,’’ said Clark.

Agricultural officials say that had the European grapevine moth (Lobesia botrana) innocently evaded inspectors on a container ship, the first trapping of the grape eater would have been near a port.

Instead the pest that has proliferated across European vineyards appeared last September in the heart of the region where fine cabernet can fetch hundreds of dollars a bottle.

‘‘My personal belief is that there are people who feel they are above the law and that they know better and therefore they’ll bring in whatever they like,’’ said USDA spokesman Larry Hawkins. ‘‘They flaunt it.’’

Steep fines and improved U.S. nursery stock since the 1980s now discourage the reckless suitcase smuggling practice, though authorities believe it still exists.

Today a grower seeking shortcuts would have to pass border inspectors and circumvent quarantines at UC-Davis’ Foundation Plant Services, funded to test imported plants for pests and diseases.

‘‘There are those who think that some of the virus problems suffered in Napa have been because of smuggling,’’ said Plant Services director Deborah Golino. ‘‘The more we move plants around the world, the more chance there is of introducing problems.’’

Entomologists say the life cycle of the moth, native to Italy but found across eastern Europe and the Middle East, make it difficult for it to survive on cuttings, so the suitcase smuggling theory might not hold up, despite the talk.

‘‘I’m not saying that people don’t still try to get suitcase wood in, but in this instance I’m not sure the pest would be transported like that,’’ said Monica Cooper, the Napa County viticulture farm adviser.

Investigators with the USDA’s Agriculture Plant Health Inspection Service say they may never know for certain how the moth traveled to wine country.

Traps to pinpoint the infestation are set 25 per square mile across Napa Valley as they begin to swarm in warmer weather, and less intensively in California’s other grape regions.

Investigators from the USDA’s Smuggling Interdiction and Trade Compliance unit are checking everything from vineyards to shipping manifests to try to find the breech in order to plug it. The task isn’t easy.

‘‘When it comes to individuals smuggling, that’s a whole lot more difficult than searching a cargo ship,’’ Hawkins said. ‘‘Looking for the source among tens of thousands of vines is like looking for a needle in a haystack.’’

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