Types of Tree Diseases that Affect the Denver, Colorado Area

The next time you are out enjoying that breathtaking landscape beauty or basking under a shade on a hot summer afternoon, remember exactly what trees provide for you and the entire planet. Not only do they purify the air, but they also boost property value, offer shade-blocking UV sun rays, cool the environment and better yet provide food.

Their importance and benefit stretches far and wide covering our environment, economical and emotional aspects which is why it is crucial to remember that they constantly need attention.

It is essential that all trees receive sufficient protection from the looming menace of tree diseases. They are especially devastating and if by chance they are left untreated, they can spread throughout an entire plantation.

In the region of Colorado, there are several common tree diseases that affect the trees in the area. They include:

Bacteria Wetwood

Among the most prominent diseases is the Bacteria Wetwood which unfortunately comprises several strains. It attacks multiple shades of trees and leaf types. Wood-colour trees that have been affected by this disease often change and assume a brownish yellow rotten state that forms around the tree’s center.

The wood produces gas and toxic ooze which inhibits healing and growth. Extra care should particularly be adhered to on spotting “alcohol flux” a characteristic white froth that comes with advanced cases.

Cytospora Cankers

This disease attacks tree barks where it creates rings around the trunks and branches. When Canker progresses, its girdles kill all tree-parts above the typical ring created. For most trees, their likelihood of contracting this fungus is particularly high where they are having pre-existing damage to the roots and or where they get stressed. Take particular caution especially with trees having recent wounds more so, birch, and apple, maple, elm, willow and spruce trees.

Marssonina Blight

This is a disease predominant with aspen trees. It manifests by forming brown spots characterized by yellow rings on tree leaves. After this early signs, the resulting effects are leaves decaying and dropping prematurely during summer as opposed to typical fall. This infection weakens trees resulting to further problems.  If you spot this problem, be sure to contact a Colorado-area tree surgeon to have it taken care of before it spreads to more problems.

Powdery Mildew

A fungus which grows as a typical white mildew on any tree surface, it affects numerous shrubs and trees. This mildew affects normal photosynthesis and inspires a host of other further problems.

Shoot Blight

Shoot Blight is a disease caused by a characteristic fungus which is surprisingly absorbed by trees through their leaves. It mainly chokes the tree branches. It mainly manifests through dark spots that appear on the tree leaves which is followed by prompt death. When it advances it can result in branches curling into a distinct �shepherds crook’. With respect to Aspen trees, it mostly spreads during heavy rains and warm temperatures.

The list of tree diseases is wide ranging and also includes Needlecast, Fire Blights, and Anthracnose.

Final Word

For anyone that has witnessed a dying or already dead tree falling especially on their premises has a firsthand experience with the dire repercussions tree diseases can inflict. When you spot any unusual manifestations or signs, a qualified arbotist is the best individual to examine and determine the most appropriate solutions.



Guidelines for Street Tree maintenance, Regulations and Laws in Denver, CO


Everyone loves trees, not only because of the shade it gives us, but also the beauty it brings to the environment and nature at large. Street tree play a major role in the community and requires maintenance every now and then. In Denver, Colorado, property owners are mainly the people responsible for taking care of the street trees. But in real sense they(the trees) are owned by the Denver residents.

To enable proper maintenance of the trees the government has place rules and regulations to be followed while pruning,planting or removal to meet the required ISA standards. On the other hand, if you have private trees such as those in your backyard, you will have fewer regulations to adhere to. In this article we will look at Guidelines for street tree maintenance, regulations and laws in Denver, Colorado.

Here are the top 5 guidelines you need to know for tree maintenance in Denver

  • Permit is Key
Tree Service cutting down a street tree in Denver, CO

Tree Service pruning a street tree in Denver, CO

Always get a permit if you are planning to plant/remove a tree near your home or to trim it. This is to avoid trees being cut off with no reason leading to destruction of trees. The permit is usually free of charge hence you not incur extra cost while getting it. The guidelines for pruning a right of way tree are usually the same as that of the licensed tree service, who can also be hired to maintain the trees if need be.

  • Trees as a Structural Hazard

Some of the trees may be harmful to you and the surrounding hence it is your responsibility to identify them and have them brought down. If you encounter a dispute with your neighbor about any street tree, the matter can be settled in a civil manner or through an intervention from the city arborist. In most cases this happens if the tree is an imminent structural hazard.

  • The Legal Pruning Cut

Legally the pruning cut must be on the outside branch-collar in the following order: first there is an undercut which is about two feet apart, the second cut at the top is a bit further out from the branch collar, while the final cut is done at the front of the branch collar removing the other two foot stub. It is crucial to note that the saws used for pruning are often sharp hence no one should sit under it during the process.

  • Planting Trees in the Right of Way

The evergreen types of trees are not allowed when planting trees in the right of way, as they cover or block the site lines. However, there are other types of trees allowed for shade such as the Kentucky Coffee tree, English Oak, Hack-berry, Texas Red Oak, Bur Oak, Catalpa, Chinkapin Oak, Japanese Pagoda tree, Sycamore and the Yellow-wood tree.

  • Tree Spacing While Planting

If you are planting a street trees you are required to space the as follows; the ornamental-trees should be about twenty five feet apart and the shade-tree to be approximately thirty five feet apart. All other trees should be about twenty feet from the street light, ten feet from the drive-ways, alleys or seven feet from sidewalks.


Trees play an important role in our environment and should not be overlooked. The rules and regulations place protecting the street trees during planting, pruning, remodeling your home, or landscaping should be followed. Above all do not attempt to take down or remove large trees on your own, it is a very dangerous job that needs to be handled by an insured tree company.

Damages to these trees may lead to you receiving an administration citation or a fine by the City Forester’s office. All this can be avoided if you follow the above pointers. For more information about the regulations and guidelines contact Denver Forestry or visit their website.

Types Of Trees Found In Denver, CO and the Rocky Mountains

Denver is the capital city of Colorado State in the United States of America. It is an old metropolis dating back to the old west era. The city is a tourist destination, it has a vast array of parks and museums that speak a lot about American history.  However its most attractive feature has to be its nature.  Among the attractions is the Rocky Mountains National Park. Often people go up there for hiking and the mountains offer some beautiful views that are made beautiful by not only the moutains but the trees as well.

There are a great number of tree species found up in those mountains. Both deciduous and coniferous trees are found and we will talk about a few of them today:

Types of trees found in Denver

The types of trees can be divided into deciduous and coniferous trees, here’s a breakdown below:

(A). Deciduous Trees

These are trees that shed their leaves annually with the oncoming of winter. The types of deciduous trees found in Denver, Colorado include the following:

  • Boxelder (Acer Negundo) Tree in Denver, CO

    A Boxelder on a sunny day in Denver.

    Boxelder (Acer negundo)

It is an indigenous species. The bark of the tree appears a color between a light grey and a light brown and has fissures when it is a seedling which later on develop into furrows as it enlarges to become a tree. It has compound leaves is a cluster of between 3 to 5 pinnate leaflets. The leaflets are 2 to 4 inches long and are green with the top side being paler than the lower side.

They have seeds that are dispersed by wind and hence are winged in adaptation. Their fruits are green when developing but turn tan once mature. The tree can grow up to 35 feet. They are adaptable trees due to the fact that their seeds are dispersed by wind.

  • Chokecherry (Prunus virginiana)
Chokecherry (Prunus virginiana)

A Chokecherry in downtown Denver.

The bark is of a copper color. It is dotted with numerous lenticels for aeration. These lenticels later develop into groves as the tree ages. The leaves are a dark green and glossy with the underside being paler than the top. The leaves are single with a length of 1 to 4 inches and having serrated margins. The fruits are cherry-like in appearance and vary in color from dark red to dark purple.

Other deciduous trees in Denver include: Gambel oak, Narrowleaf Cottonwood, Peachleaf Willow. Plains Cottonwood and Rocky Mountain Maple.

(B). Coniferous Trees

These are trees belonging to the class Coniferales. They are tree species that are evergreen as they do not shed their leaves. They have leaves shaped like pines and they develop cones as their fruits. They usually fertilize asexually. Among the coniferous trees of Denver, Colorado are:

  • Blue Spruce (Picea pungens)
Blue Spruce (Picea pungens)

A Blue Spruce in Boulder, CO

They are characterized by their needle-shaped leaves that are blue in color hence the name. They have brown barks that usually are encrusted by a thick layer of scales for trees that are mature. Their cones are shiny and light brown in color. The seeds are winged as they are dispersed by wind. The trees ca attain a height of 115 feet.

  • Bristlecone Pine. (Pinus aristata)

The color of the bark of this tree usually changes. It is light brown when the tree is an infant but alters to a copper color when the tree matures. The leaves are dark green and are usually densely clustered around a twig. The cones are cylindrical and dark purple in color. Seeds are winged but the wings are detachable.  See image below:

Bristlecone Pine. (Pinus aristata)

Bristlecone Pine, one of the more uniquely shaped trees of the Rocky region.

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Tree Removal Denver
276 S Emerson St
Denver, CO 80209
Phone: 855-335-1596