Michael MoranNovember 14, 2012 06:00
CHEDISTON, England — When it came, the invasion was silent. Insidiously, its vanguard arrived in plain sight, indistinguishable from the native population. It spread over farmlands, across valleys and especially into the precious remaining forests, killing slowly and quietly. The ash is the fourth-most common species today and beloved by millions for its beauty, but it appears to be doomed thanks to an incurable blight.