DULUTH — At first it looked as if the invasion had begun: the dreaded onslaught of forest tent caterpillars eating their way across Northland forests, a plague that hasn’t hit hard for 20 years. Up ...

On one of the friendliest platforms imaginable, a ferocious battle rages. While mowing its way through the surface of a trembling leaf, an aspen leaf miner meets one of its kind. Instead of offering a ...

I have a poplar tree in my backyard that is 1 1/2 years old. Over the past year and a half it has done a few funny things. Upon planting it, the leaves went yellow in the summer. I think we were over ...

IT is well known that the vibratory motion of the leaf of the aspen and other poplar trees is caused by a flattening of the petiole at its junction with the lamina. The lower part of the leaf-stalk is ...

Question: What’s the difference between a popple tree and an aspen? I hear the terms used interchangeably. Answer: Popple (or poplar) are common names for aspen trees because their genus is populus, ...