We just got back from a road trip to Vermont and kept seeing purple triangles hanging from trees in various places along Route  89 and a few other smaller roads along the way.  We thought it was a tourism promotion or something.  Here is the very interesting answer:
(broken link removed to http://www.vermontagriculture.com/ARMES/plantindustry/caps/VermontEABTraps.html)
It was not what I was expecting, but they are being proactive.
	
		
			
		
		
	
				
			(broken link removed to http://www.vermontagriculture.com/ARMES/plantindustry/caps/VermontEABTraps.html)
It was not what I was expecting, but they are being proactive.
	
	
			
			
			
			
  Trip was great cept for the 5 of 7 days of rain.