The deadly vigour of the emerald ash borer has, incidentally, allowed scientists in some fields to view the relationship between humans and trees in a new light. A US Department of Agriculture Forest Service survey of mortality rates in counties affected by the beetle noted an increase in the frequency of death by cardiovascular and lower respiratory tract illnesses. We should be cautious about reading too much into this, because the survey was small and controlling for demographic factors is complicated. However, it is a reminder that the concord between trees and human health is nuanced in many ways, ways that we often fail to acknowledge today, even though the likes of Henry David Thoreau were writing about them 150 years ago, and William Wordsworth sixty years before that.
Woodworkers use the term ‘figure’ to collectively describe the markings on the surfaces of wood. Figure is the result of a combination of all the anatomical features, from normal wood structure, including growth rings, to various abnormalities like knots. Generally, the more inconsistent the grain and the greater the frequency of abnormalities, the more pronounced the figure is. Figure comes in innumerable forms, many of which are distinctive and characteristic of particular tree species. Woodworkers have a delightful vocabulary of words and phrases to describe figure: ribbon, bird’s eye, flame, fiddleback, quilted, blistered, stripe, broken stripe and dimpling figure are just a few.
As we were talking about the emerald ash borer, Jeff opened a drawer in his desk and withdrew two leaflets and a laminated, luggage-label-size card. He glanced at them briefly and handed them to me. The card showed actual size photos of larvae and adult beetles. The leaflets contained information on the life cycle of the emerald ash borer and the symptoms of infestation of trees, as well as stern warnings about the movement of firewood.
‘Take ’em, Rob. You need to know all about it too. It’ll be in Britain some day soon, I guess. The authorities here did a good job getting information about the ash borer out. It first got down into southern Pennsylvania six years ago – and we thought then that there’d be no ash left here by now. No ash, huh? It was a big concern, but somehow it has not found its way into these woods, at least not yet,’ Jeff said, raising a hand towards the window and the silent forests beyond. ‘The ash borer can only fly about a half mile a year. As long as no one takes the beetle and drives it into the centre of the woods, then, you know . . . I’m more optimistic than I was, but can I sit here and say for sure that twenty years from now there’ll still be loads of ash round here? No, I can’t. It would be a terrible thing to lose it.’
There was a knock and the door to the office swung wide open. A glint-eyed, bright-faced lady in her seventies stood smiling at us. ‘You boys hiring?’ she said. Laughter cut through the still air and we rose to our feet. Jeff and I walked outside to the row of trucks parked on the grass beside the single-track road. The last, lambent light of the day was brushing the forest canopy on the far hills. The temperature had dropped; there was a hint of winter.
Jeff breathed deeply. He raised and reset his baseball cap again. ‘Right where we live here, right in this area, in the Allegheny Mountains and on the Appalachian plateau, this is not just where the best ash comes from, it’s where the best timber comes from. This is the best hardwood timber in the world. It’s why your people came here in the first place, Rob.’