Beetlemania: Insect poses long-term threat to Pine Barrens

05/04/2015 8:00 AM |
Southern pine beetles have been confirmed in the above locations so far, officials say. (Eric Hod illustration)

Southern pine beetles have been confirmed in the above locations so far, officials say. (Eric Hod illustration)

The southern pine beetle, as it turns out, isn’t all that southern anymore.

The voracious and highly destructive insect — which decimates millions of cubic feet of timber across the country each year — has been making a slow expansion north over the past couple of decades. The beetle arrived in New Jersey in 2001, crossed the Great Egg Harbor River south of Atlantic City in 2008 and arrived on Long Island this past fall.

Now, authorities are trying to figure out how to contain the spread of the pest in the Pine Barrens and beyond. So far, it has infected trees at least a dozen state and county parks across Suffolk County (see map, above), not to mention on private land.

“We assume that all in all, we’ve lost a good thousand acres,” said John Wernet, regional forester with the Department of Environmental Conservation. The DEC, in conjunction with other agencies, is conducting aerial and ground surveys to determine the full extent of the damage. Results are expected in the next couple of months.


THE THREE STAGES OF A SOUTHERN PINE BEETLE INFESTATION


The levels of infestation are bound to affect the health of the Pine Barrens for years to come.

“It’s not possible to eliminate,” said Kevin Dodds, an entomologist with the U.S. Forest Service. “I hear a lot of people use the word ‘control,’ but ‘control’ implies you have the ability to knock things back. It’s better to look at this as managing it.”

CLIMBING NORTH

A few years ago, Rob Corcory, who had retired from a 37-year career with the New Jersey State Forestry Services Department, was asked to return as the state’s southern pine beetle project manager.

By then, however, scientists estimated that it was just too late to stymie the insect’s northward march.

“We tried to keep it in the southern half of the state, but it started creeping north. Everything was below the Mullica River [in New Jersey] until a year or two,” Mr. Corcory said.

R0430_beetle_C.jpgScientists have attributed the beetle’s northern migration to climate change. The coldest night of winter in New Jersey is now seven to eight degrees warmer, on average, than it was 50 years ago, said Matthew Ayres, professor of biological sciences at Dartmouth College. And warmer temperatures at night have allowed the beetle to survive the farther north it goes.

On Long Island, temperatures recorded this past winter at the National Weather Service in Upton dropped to -4 degrees on three nights in February, which helped suppress the beetle’s spread this spring and “bought us some time” to fight this year’s infestation, said Mr. Wernet of the DEC.

It remains unclear exactly how the beetle arrived on Long Island, but its presence has now been confirmed as far north as Hartford, Conn.

It’s been speculated the beetles washed ashore on Long Island during Superstorm Sandy, Mr. Dodds said. Or it “could have just spread in smaller infestations,” he said.

What is clear is that they’re here.

Caption: Researchers from Dartmouth College and the New Jersey Forest Service discuss southern pine beetle management in the New Jersey Pinelands. (Courtesy: Matt Ayres/Dartmouth College)

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