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Shift switch: Arborist battling the Emerald Ash Borer invasion

There are two kinds of people out there, certified arborist Steve Pfohl told me recently: those that take their trees seriously and those that take them for granted. I'm in the former camp and so when I got the chance to spend some time with Pfohl injecting ash trees on the Northwest Side, I eagerly accepted.

Jul 11, 2010