Denver Lawn Care and Tree Service Company Swingle Provides Pest Predictions for Colorado Landscapes

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Denver, Colorado’s Swingle Lawn, Tree and Landscape Care provides 2015 pest predictions for Colorado landscapes.


Swingle Plant Pathologist inspects Colorado Tree Samples for Emerald Ash Borer

“Knowing predictions going into the spring can help homeowners prevent losing their trees or plants by taking proactive measures,” says Steve Geist Swingle Senior Consulting Arborist.

Pest can have a major impact on Colorado landscapes every year. With spring approaching, the damage created by these issues will start to become more apparent, if they have not already.

“As Colorado’s lawn care and tree service experts, we are committed to keeping the community informed on possible threats to Colorado landscapes, so they have the opportunity to make informed decisions about what is best for their landscapes,” said Swingle President John Gibson.

Emerald Ash Borer:
Emerald ash borer was discovered in Colorado in 2013. EAB is the most destructive urban forest pest - killing any ash tree in its way. The wood-boring pest has infested ash trees in Boulder, resulting in many trees over several city blocks showing symptoms of infestation and eventually dying. The pest has not been found outside of the city. It is suspected EAB has been feeding on ash trees for six years in the affected area. It is believed that over the next 18 months, the borer will be found outside of the City of Boulder and will call for immediate action to be taken in order to save Colorado ash trees. It is best to work with a professional to determine ash trees at risk and hire a licensed applicator to protect trees.

“Knowing predictions going into the spring can help homeowners prevent losing their trees or plants by taking proactive measures,” says Steve Geist Swingle Senior Consulting Arborist.

Pine Wilt Nematode:
States sitting to the east of Colorado have lost thousands of Scots and Austrian pines due to the pine wilt pest. A wood-boring insect (pine sawyer) spreads a tiny worm-like animal called a nematode to healthy pine trees. The nematode will multiply, clogging up water conducting tissues in the tree. Damage of the pine wilt is found in the late summer and fall when trees die rapidly from the pest. Swingle diagnosed a few trees in 2014 with pine wilt, meaning the nematode is still out there. A hot spring could lead to pines dying in the fall of 2015. Any high value tree should be protected. It is recommended to work with a certified professional to discuss treatment options.

Japanese Beetle:
Japanese beetles tend to be present during the beginning of July. Japanese beetles need consistent soil moisture to mature – especially in the winter. Abundant moisture results in seeing more beetle activity. Japanese beetles feed on plants such as roses, Virginia creeper (vine), linden trees and many other ornamentals. Adult Japanese beetles chew and defoliate plants in the middle of the summer. If the 2015 winter continues with consistent moisture, it is expected the beetles will be present. Spray treatment options are available, yet the treatment will not eradiate the insect but help control them. A licensed applicator can make recommendations on treatment options.
As information develops and discoveries are made, the company will provide information about pests in our area and the best treatment options available for protecting Colorado landscapes.

About Swingle Lawn, Tree & Landscape Care
Founded in Denver in 1947, Swingle Lawn, Tree and Landscape Care has grown to be the one of the largest residential and commercial lawn service and tree care companies in Colorado, employing more certified arborists than any other Colorado company. For information please contact Kellie Houghtaling (303) 337-6200 or visit

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Kellie Houghtaling
Swingle Lawn, Tree and Landscape Care
since: 11/2010
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