![]() ![]() Volcanic Ash is defined as very small solid particles ejected from a volcano during an eruption which have intermediate axes measuring 2 mm or less (US Geological Survey) and "fine ash" is further defined by the same source as particles smaller than 1/16 (0.0625) mm across. identification of Emerald Ash Borer was in southeastern Michigan in 2002.Definition. Native to Asia, it likely arrived in the United States hidden in wood packing materials. The Emerald Ash Borer (Agrilus planipennis or EAB) is responsible for the destruction of tens of millions of ash trees in 30 states.
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