By Clothilde Goujard

Thousands of small test tubes were set up in neatly organized rows in the cupboards of Armand Séguin’s laboratory.

Soon, the scientist would be filling them up with sap squeezed from the bark of ash trees.

Séguin has been studying cancer for more than two decades. Now he's turned his expertise to stopping the spread of the destructive emerald ash borer, a green metallic-looking beetle that is smaller than a fingernail.

By Ted Gregory

Lydia Scott logged more than 600 miles in her hybrid SUV last year, identifying tree species, measuring them and estimating their maturity on green patches from Chicago's South Side to far-flung Harvard.

by Madelon Wise

The emerald ash borer, which is destroying ash trees in a large swath of the nation, has apparently spread to a different tree, a researcher at Wright State University suspects.

Biology professor Don Cipollini, Ph.D., director of the Environmental Sciences Ph.D. Program, has found that the invasive green beetle has apparently begun to attack white fringetree.

By Timothy B. Wheeler, The Baltimore Sun

A voracious Asian beetle that's killed millions of ash trees across North America has finally been spotted in Baltimore, posing a costly and difficult challenge for a city that stands to lose more than 200,000 of its most common trees to the exotic pest's onslaught. It could denude blocks lined with ash and cost the city millions of dollars to remove dead or dying trees from public lands, while homeowners may be forced to pay hundreds or even thousands to treat or replace their vulnerable trees.