D-shaped holes in the bark or new tree shoots emerging at the root zone of your ash trees may be a sign of infestation by the Emerald Ash Borer, an insect native to the Far East that targets ash trees, says Dave Dailey of Birchcrest Tree and Landscape, in Rochester, N.

WSJ: Getting to the Roots of Your Trees' Stress

While most of the freight will have been flown straight on from last weekend's season-opener in Qatar, the cloud of ash has created a no-fly zone over much of northern and central Europe and made it impossible for many team personnel to reach Japan.

BBC: Volcanic ash cloud forces postponement of Japan MotoGP

Firewood over 4-feet long can also move outside the zone because at that length the ash is easy to recognize and remove, Lambert said.

WSJ: Mass. creates quarantine zone to contain insect