Aged white pine
Two or three years ago, maybe more, my big pine tree began to hold only half the needles that it used to. And the base of the trunk has lost some of the bark. Is this tree in need of immediate removal?
Ramsey County Minnesota
Without more information and in the absence of photos I can only make a guess. It if is an old tree it may be that it is shutting down. The bark loss could be damage from critters or mechanical; or insects. If it continues to decline and actually drops branches, then it is time to take it down. Here is a link to our page on needle loss on pines. Maybe one of the conditions will match up. Hint: you need a magnifying glass. http://apps.extension.umn.edu/garden/diagnose/plant/evergreen/pine/needlesolderdiscolored.html