Red pine tree
Our five year old red pine has nice, new growth, but lost all of its needles. Looks mighty strange. Virus, insects, etc.? Since we have several other red and white pines, should we take it down so they don’t get whatever this is. Thanks, Nancy Alfton
It is difficult to diagnose a tree problem without an onsite inspection. It is next to impossible without at least a photo.
With the little information you've given, I'd guess you have pine sawflies. Read here:
For future reference, please note this diagnostic site: