By your description these devices most likely are glue traps baited to catch the dreaded Emerald Ash borer. The insect flies to the board and sticks to it. Entomologists, foresters and arborists monitor the insect populations in areas.
Here in Pa the boards were discontinued as our area is being hit hard by the Borer. State says we may loose 80% of our Ash trees to this pest.
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