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The scientists used a unique empirical dataset, taking data from 40 plots of mature European beech forests across the state of Lower Saxony in Germany.

By late September, her order of European beech had arrived.

To assemble the data set, research teams looked at about 20 trees from each of the dozen tree species, which included maritime pine, Norway spruce, sessile oak, stone pine, and European beech.

Forest Service researchers announced they had found an undescribed beetle on stressed European beech trees in a New York City cemetery.

The eight specimens that turned out to be the new Agrilus beetle were pulled from a European beech tree that was stressed but not dying, Mr. DiGirolomo said.