trees

Did you know that USDA has declared August as Tree Check Month? That’s because August is the peak time of year to spot the Asian longhorned beetle (ALB)—an invasive wood-boring beetle that attacks 12 types of hardwood trees in North America, such as maples, elms, horse chestnuts, birches and willows. Checking trees for the beetle and the damage it causes is one way residents can protect their own trees and help USDA’s efforts to eliminate this pest from the United States.

Humans adores trees. But humans also migrate and trade, habits that led to the accidental introduction of insects and diseases that harm trees and alter the landscape. Examples are easy to find and may be outside your front door: American elms that once dotted streets across America succumbed to Dutch elm disease. Now all colors of ash species – black, green, white, pumpkin, and blue – are threatened by emerald ash borer. The already uncommon butternut tree, also known as white walnut, faces the possibility of extinction from a mysterious attacker.

When it comes to ridding the earth of pollution leaking from dumps, closed landfills, and other waste sites, specific types of trees are quietly and efficiently absorbing the toxins.

Why are Rocky Mountain Research Station scientists sampling tree rings in the Pinaleño Mountains of southeast Arizona? Because tree ring samples reveal the history of fire. When fire scorches a tree, the tree floods its wound with sap, which protects the wound from wood rot decay for hundreds of years, as long as fires keep burning at a low intensity.

2018 was another record year of hurricanes and fires, which have inflicted huge economic losses to timber landowners as well as homeowners with landscape trees.

Immobile and long-lived, trees endure extreme weather, fires, and pests for tens, hundreds, and even thousands of years. In Fishlake National Forest, Utah, there is a quaking aspen colony spanning 106 acres that is roughly 80,000 years old. To give you a sense of scale, if the average human lives 79 years, this aspen colony has already lived over a thousand times longer!

April may be Invasive Plant Pest and Disease Awareness Month, but I live it year-round. I spend my days with a team of fellow tree climbers, looking for signs of Asian Longhorned Beetle (ALB) damage in the treetops of Bethel, Ohio. This is where ALB damage is most evident – oftentimes not visible from the ground level. ALB damages and kills maple and other hardwood trees.

After timber harvest or a forest fire, reforestation is essential for a productive working landscape and healthy ecosystem. When replanting you need to decide where you will get tree seeds or seedlings. To help you and other forest land managers, reforestation scientists at the USDA Forest Service Pacific Northwest Research Station, Oregon State University, and the Conservation Biology Institute developed a web-based mapping application, the Seedlot Selection Tool.

In the cramped environs of U.S. cities every inch counts, especially if attempting to make space for nature. But now city planners and urban foresters have a resource to more precisely select tree species whose growth will be a landscaping dream instead of a maintenance nightmare.

The U.S. Forest Service’s Pacific Southwest Research Station recently published a technical manual and launched the most extensive database available cataloging urban trees with their projected growth tailored to specific geographic regions.

The old proverb: “You can’t see the forest for the trees” should have continued with a line saying that it’s even harder to see below the trees. Because seeing under trees, their root system to be exact, is how scientists understand and appreciate the things that will determine what we all see in our future forests. A new publication just released by the US Forest Service seeks to help forest managers recognize important root diseases and provide the best management strategies.

Ordinarily, we depend on decay organisms to break down wood to recycle enormous amounts of above ground materials such as leaves, limbs, and tree trunks. Without these subterranean decomposers, we would find ourselves buried in forest debris. But what makes beneficial decay organisms go bad and attack the root systems of living trees?  In a word, disease.