Boom in Pandora moths a bust for pines of far northern Arizona

FLAGSTAFF -- The lab countertops at Northern Arizona University's School of Forestry are covered with ponderosa pine branches that have several Pandora caterpillars munching away on the needles.

Richard Hofstetter, a forest entomology professor, is studying a population boom among Pandora moths in the northern reaches of the Kaibab National Forest - the most seen in the past 20 years.

It stems from a bumper crop of caterpillars last summer, before they burrowed underground and spent a year turning into moths.

"It's important to understand our native species, and especially one that has such a high abundance and can outbreak like this," Hofstetter said.

It's especially important, he said, because as caterpillars the insects are prodigious eaters. In great numbers they can seriously damage a forest, as was the case last summer, when 1,000 acres of Kaibab National Forest north of the Grand Canyon wound up completely defoliated.

Shayne Rich, who with her husband owns a gas station near Jacob Lake, said that during a peak in August hundreds of moths would swarm the lights each evening.

"It was crazy. As soon as the sun went down and lights came on the moths came out. By the morning a lot of them had died," she said. "The whole base where the cars drive was covered in moths. It took a couple hours to sweep up."

It's thought that the Pandora moth's population surges around every 20 years due to a virus that controls its numbers dying off.

When there isn't a surge in population, Hofstetter said, over the span of a year researchers will catch 50 to 100 moths. These days their traps are catching 16,000 moths every three days.

Hofstetter said these moths have already laid eggs.

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Boom in Pandora moths a bust for pines of far northern Arizona