Cytospora. Stressed aspen often fall prey to cytospora, a canker-causing fungus that attacks trunks or branches. Entering the tree through wounds, cytospora creates long, oozing, orange cankers ...

Pat Engler-Parish, 32, is senior vice president of Aspen Tree Software Inc. in Laramie, Wyo. ”I have the best job in the world,” said Engler-Parish, who is in charge of training, customer ...

Since quaking aspens self-prune their lower branches, eye-shaped black scars are common on the lower trunk. There are both male and female aspen trees. During the time that both male and female ...

We have a problem with our aspen trees. Nearly all of them are ... That's followed by death of smaller twigs and then larger branches. If your tree does have cytospora, you're eventually going ...

the aspen trees should be casting a shadow. But something is wrong in this stand: the treetops are nearly bare, their branches twisting starkly into the blue sky. Sarah Tharp, a wiry biologist for ...

The insects construct their silken tents on aspen tree branches and feed on the leaves. The eating frenzy leaves large swaths of aspen trees bare of foliage. If the caterpillars don’t show up ...