Are those purple boxes appearing near St. Paul trees some kind of Vikings promo? Maybe a prank by graduating seniors? Or a prelude to an alien invasion? The truth is somewhat more prosaic – the boxes are an attempt to trap the invading Emerald Ash Borers. The PiPress explains:
Each of the large kite-like traps contains a scented lure designed to attract the shiny green beetles, and each is covered with a sticky substance that prevents them from escaping. …
But purple? “In layman’s terms, they are attracted to purple,” said Ahlen, one of several people who are putting them up.
If you want to know how to tell whether the Emerald Ash Borers are invading your trees, the Minnesota Department of Agriculture has a checklist for you.
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