Leading Innovator in Tree Insect Control

Ross Tree Company prides itself on being a leading innovator in tree insect control. We were the first tree company in Denver to offer tree injections, a practicable alternative to spraying trees. Trunk injections ensure that only the tree gets the product, not the surrounding environment. Please see our insect calendar to find out more information about local harmful tree insects and diseases.

Sometimes spraying is warranted because of an insect infestation that needs immediate attention. Ross Tree sits down with the residential or commercial property owner to discuss all options before treatment commences. For environmentally friendly plant health care services, click here to fill out a service request form or call 303-871-9121. We are at your service.

Licensed and Certified for Insect Control 

Ross Tree’s motto “Integrity in Action” means we are committed to minimizing our impact on the environment when delivering plant health care services. We promise to use the products necessary to treat your trees and nothing more. We deliver on this promise because our staff possesses the proper training and credentials to treat trees properly in the Denver area. Ross Tree has three Qualified Supervisors licensed by the Colorado Department of Agriculture to handle pesticide products.

What Are Systemic Tree Injections?

Trunk injections treat your trees for various tree insects found in the Denver area, including Aphids, Emerald and Lilac Ash Borers, Mountain Pine, and IPS Engraver Beetles. We also inject nutrients and antibiotics to correct deficiencies or control tree diseases. Ross Tree uses systemics products to treat the following tree insects:

Emerald Ash Borer (EAB)

The EAB is here to stay. Since the beetle is moving up and down the Front Range, it is just a matter of time before it arrives in Denver. American Ash trees have zero immunity to the EAB and will die if not treated. So, prevention is the best tactic to save high-value Ash trees against the EAB. EAB control products are also effective against the Peachtree, Lilac, Ash Borers, and the Zimmerman Pine Moth. Click here for our handbook on the Emerald Ash Borer.

Elm Leaf Pests

Elms need some extra help in Denver since they are not native trees. Wet springs support large infestations of the Elm Leaf Beetle. We use systemics products to control the Elm Leaf Beetle and the Elm Leaf Miner, European Elm Flea Weevil, and Japanese Beetles. Click here to link to our handbook on Elm Leaf Pests. 

Soft Body Tree Pests

Tree aphids and scales become serious tree pests when Denver has a wet spring. Many of these pests are tree species-specific. Applying dormant oils in the winter or systemic injections in the early spring controls many scale insects found in the Denver area. On the other hand, hot summers support the growth of the Honeylocust Spider Mite. Systemics are effective against this mite. Click here for more information on Spider Mite control. 

Thanks for being so accommodating, crew did a great job as usual.
Judy

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Pine Tree Care Handbook

How Do I Keep My Evergreen Trees Healthy In Denver? Ross Tree publishes handbooks on key tree issues common to the Denver area. The Pine Tree Care Handbook identifies pines and other conifers that grow here and the insects and diseases that inflict them. Colorado has...

Surprising Rise in Tree Aphids This Summer in Denver

Each spring is different in Denver. Last year we had a wet spring, and an Elm Leave Beetle infestation occurred. In 2022, we had a dry early spring with little snow; it rained a lot in late May and early June. Tree aphids thrive in these conditions, and these...

What To Do About Japanese Beetles?

The Control of Japanese Beetles You know it is summer in Denver when we start handpicking Japanese Beetles (Popillia japonica) off plants in our yards. The beetles favor roses, grape & Virginia Creeper vines, but the pests are generalists and attack many plants...

Standards Based Pruning Handbook

Proper Tree Pruning Proper tree pruning saves money in the long term because healthy trees need less maintenance. Tree trimming encourages good tree structure and improves the aesthetic appeal of a tree. The best way to assure proper tree service is to hire a tree...

Surprising Rise in Tree Borers this Spring in Denver

Ross Tree has noticed infestations of tree borers in the field this spring in both conifers and hardwoods. Our certified arborists believe that winter droughts in the Denver area create stress making trees easy targets for these insects. It is extremely dry in Denver...

Favorite Trees in Denver

We must love trees in Denver because almost any seen in the City are planted. Denver's unpredictable spring and fall weather and clay soils make it hard to grow trees. Some trees, like Ash, should not be planted because of the recently arrived Emerald Ash Borer....

Top 5 Spring Tree Care Tips

Early Spring Tree Care Tips To Set Up Yard Trees for a Healthy Growing Season in Denver Spring officially begins in March in Denver, but we might be surprised by polar plunges and snowstorms in April. Trees go into full pitch, sending nutrients to their leaf and...

How To Deal With Cankers On My Honeylocust Trees?

Honeylocusts Thyronectria Cankers Over the last two years, the drought and polar plunges that have hit Denver have weakened the ability of Honeylocust trees to fight off disease. Thyronectria cankers are notorious for harming and killing Honeylocusts in the Denver...

Winter Tree Care Handbook

Close of the Year Tree Services Trees are large, tall, and immovable. They have no choice but face what our weather throws at them in the winter. Trees adapt well to cold weather if given time to harden. However, abrupt, unexpected polar plunges and winter droughts in...

Winter Tree Watering

Why Water Trees in the Winter? According to 9News, Death Valley got more rain than Denver in the final six months of 2021. With these conditions, it is a good bet that all trees in the area are drought-stressed and need supplemental watering. Do not let the latest...

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