The most visible sign of EAB infestation is significant crown dieback in the ash (Fraxinus). It is important to first identify and locate any ashes on your property for examination. There are many online references for proper identification or an arborist could ID your ashes for you as well. There may be epicormic sprouts (suckering) on the tree, bark slits and the characteristic 'D' shaped exit hole (see two photos below) in the bark. The exit hole is 1/8" in diamter and can have any orientation in regards to the "flat side". There are other beetles and insects that normally will visit ashes so focus on the characteristic signs of EAB. While the adults can't fly very far, the spread of EAB thus far has been quite methodical although odd populations have sprung up here and there presumably as a result of firewood movement. EAB is easily transported long distances in infested firewood. The bottom photo shows the logo on one of my T-shirts which says it all. Transporting firewood in to state parks, campgrounds, etc. could have a horrible impact on native ashes (700+ million in WI alone) and there have been significant efforts to limit the spread of EAB thru education initiatives. Early detection efforts have value as they help slow the spread of EAB. There are currently proactive chemical treatments that are offered to thwart EAB in desireable trees. I'm not up to speed with all of these new chemicals but there is a wealth of information on the internet and from various Extension sources. Do some more research on this topic as denial wont change the fact that at least for us in this area, EAB is here and is just in the infancy of infestation.