Mass Audubon will restore acres of pitch pine forest at the Flat Rock Reservation in Fitchburg. Skip to main content. WBUR. 90.0 WBUR - Boston's NPR News Station.

A pitch pine tree at the Wertheim National Wildlife Refuge in Shirley on Oct. 29, 2014 shows pitch tubes, or nodes of tree sap, which is a sign of the presence of the Southern Pine Beetle.