Don’t Judge A Tree By Its Cover: Winter Tree & EAB Treatment Guide

Don’t judge a tree by its cover: Winter tree & EAB treatment guide

  • February 6, 2018

DENVER — Although winter is the time when trees go dormant, it is a good time to start planning for tree care. It might be hard to tell in the winter, but not all ash trees are healthy and thriving. They may look okay on the outside, but the inside might be another story, and no matter the time of year a tree professional can help assess your tree.

For example, a large ash tree in Louisville was recently removed causing a bit of stir in the neighborhood. The tree provided valuable shade to neighboring houses close to the downtown area. But, despite the healthy exterior, what couldn’t be seen on the outside was that the center of the tree was hollow. A hollow tree can be a major safety issue.

“A cavity in a living tree can contribute to a tree being unsafe,” said Sara Davis, Urban Forestry Manager, Office of the City Forester, City and County of Denver. “When a tree develops problems, it is frequently difficult to decide when to replace or remove it. The one option you shouldn’t consider, however, is treating or replacing your ash tree yourself if you’re not a licensed tree professional.”

Davis did share a few tips for how residents can protect their ash trees and help trees survive the winter season.

  • Mulch – Add a thin layer (no more than 2 inches) of mulch around the base of the tree
  • Water – Keep trees, especially smaller or newly planted trees, well watered until the ground freezes
  • Prune – Pruning trees during dormancy can help prevent the spread of disease. You can also easily see the tree’s structure and identify problem branches.
  • Treat – Residents who want to keep their ash trees should work with a licensed and insured arborist or tree service company on an Emerald Ash Borer treatment plan. Treatment, which is 90 percent effective, must be repeated every 2-3 years. Choose from this list of approved tree services and get information about state licensing.
Emerald Ash Borer Drone Research Ongoing In Colorado

Emerald ash borer drone research ongoing in Colorado

  • October 27, 2017

BOULDER, Colo. — An aerial assault has been launched on emerald ash borer (EAB), beginning where the invasive pest was first found in Colorado.

Arbor Drone, Spectrabotics, and researchers from Colorado College began collecting data this summer using drone flights over southwest Boulder to study trees affected by EAB. Arbor Drone’s Dan Staley told The Denver Channel that the main purpose of the Boulder drone flights was to use a multispectral sensor to study the light reflectance of ash trees attacked by EAB.

The City and County of Denver funded this early drone study to better manage EAB when it arrives in the Mile High City, as part of its Be A Smart Ash campaign.

While Enjoying Denver’s Fall Color, Take Time To Appreciate Our Ashes

While enjoying Denver’s fall color, take time to appreciate our ashes

  • October 6, 2017

DENVER — As a natural prairie, Denver wasn’t blessed with a host of native trees. That, in the humble estimation of Denver City Forester Rob Davis, is what makes ash trees worth savoring every fall.

“Colorado in general doesn’t have a lot of big shade trees that end up with a nice red or purple fall color,” Davis said. “So for me, fall is the time that I realize just how many ash trees we have in Denver.”

And that’s important for Davis, because he knows what’s coming: the emerald ash borer (EAB). The tiny green invader feasts on ash trees, and it’s now the most destructive forest pest in U.S. history, having caused billions of dollars in damage to ash tree populations in more than 25 states.

EAB was discovered in Boulder in 2013 and in Lafayette earlier this year, meaning it’s just a matter of time before it arrives in Denver and poses an immediate threat to the 1.45 million ash trees in Denver. That’s right, folks: 1 in 6 Denver trees is an ash. And the first step when it comes developing our EAB defense plan as a city is learning how to identify ash trees.

As far as fall color goes, green ashes turn a vibrant yellow. That’s great and all, however it somewhat pales in comparison to the white ash, which can change a whole host of colors from deep purple to a lighter red.

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Emerald Ash Borer Discovered In Lafayette, Colorado

Emerald ash borer discovered in Lafayette, Colorado

  • August 9, 2017

LAFAYETTE, Colo. — Emerald ash borer (EAB) has been discovered in Lafayette, the Colorado State Forest Service (CSFS) confirmed on Wednesday. Lafayette is now the third city in Colorado facing an EAB infestation.

Not entirely unlike the mountain pine beetle, which decimated pine trees across hundreds of thousands of acres in Colorado’s high country beginning in 2008, EAB has decimated ash tree populations in more than 25 states and parts of Canada, causing billions of dollars in damage over the last 15 years.

CSFS community forestry program manager Keith Wood also confirmed Wednesday the newly found infestation in Lafayette remains within Colorado’s EAB quarantine zone. That zone includes Boulder, where EAB was discovered in 2013, and Longmont, where EAB was discovered in 2016. Lafayette is less than 13 miles from each city.

“Having a new detection in this area was not unexpected,” Wood said. “But it certainly highlights the need for Front Range communities to be planning now, before EAB arrives.”

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Make Your Emerald Ash Borer Plan At The Colorado Garden & Home Show

Make your emerald ash borer plan at the Colorado Garden & Home Show

  • February 4, 2017

DENVER — Looking to find out if you have an ash tree vulnerable to emerald ash borer? Want to learn how to protect your ash tree from the most destructive forest pest in U.S. history? Would you like to discover a way to cost-effectively turn any urban tree you may need to remove into a functional and beautiful wood product?

Then you need to stop by the Be A Smart Ash booth at the 2017 Colorado Garden & Home Show at the Colorado Convention Center in Denver from Feb. 4-12!

Emerald ash borer (EAB) has already destroyed hundreds of millions of ash trees, causing billions of dollars in damage in more than 25 states. And while it may not have arrived in Denver yet, EAB was discovered in Boulder in 2013 and in Longmont just last year. So in reality, it’s only a matter of time before EAB arrives in the Mile High City and poses a direct threat to the Metro area’s 1.45 million ash trees.

That’s right folks: 1 in 6 Denver trees is an ash, and you may not even realize that you have one in your front yard or a nearby right-of-way.

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