http://www.emeraldashborer.info/files/MultiState_EABpos.pdfThe EAB, I believe, was introduced from Detroit, not Chicago. The map certainly shows a center around Detroit.
The EAB is the fault of the Chinese, believe it or not. It was introduced when some Chinese wood products arrived containing EAB eggs or larva. It is thought that it was the result of port authorities allowing a shipment through customs that did not meet USDA regulations. For those of you who have ever traveled abroad, you know the USDA has a LOT of regulations on what is and is not allowed into this country, to stop things like this from happening. they don't work, obviously, if they are ignored. The Chestnut blight, I believe, is the result of a similar happening.
