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Partner Post: August is Tree Check Month

Imagine what the summer heat would feel like without the cooling shade of the trees in your backyard.

August is Tree Check month, according to the Invasive Species Council. This month, take a few minutes to check trees for invasive pests and the damage their larvae leave behind.

An invasive species is one that is non-native and likely to do harm, often displacing and destroying plants or animals. They are the largest threat to native wildlife, ecosystems and, according to Tom Beshoar, a certified arborist at Davey Tree’s St. Louis office, “a considerable threat to urban forests.”

Due to the lack of natural competitors and predators, non-native species often increase in numbers and spread swiftly. Beshoar says the best approaches for dealing with invasive species are early detection and rapid response.

“Detecting invaders quickly, and responding rapidly to eliminate them, is essential to limiting the impact and cost when prevention fails,” Beshoar said. “Plant diverse, native plants and remove invasive plants in your garden.”

It is important to learn which invasive species are in your area, and what actions are being done to manage them. Here are some invasives to look out for in your area:

Spotted Lanternfly

The spotted lanternfly is the newest invasive on the scene. While it may not yet have been spotted in your state, this invasive plant hopper travels quickly. First discovered in 2014 in Pennsylvania, the bug has also been detected in Delaware, New York and Virginia. Early detection is vital for the protection of several agricultural industries and your trees. Ongoing infestations will need the right management strategies in order to keep populations to a minimum.

Emerald Ash Borer

By now, you’ve probably heard of the emerald ash borer, often called EAB. It’s an incredibly destructive invasive insect that was first detected in Michigan in 2002. EAB has been detected in 35 states, many of which are part of a national quarantine zone, limiting the movement of all hardwood, firewood, and green wood products, nursery stock, and any plant materials from any ash species in an effort to stop the spread of this beetle.

Gypsy Moths

The gypsy moth is an invasive forest pest from Europe that is one of the most damaging tree defoliators currently in the U.S. They were first introduced in the 1860s by an amateur entomologist in Medford, Massachusetts, and are now well established throughout the United States. They hatch from late April to early May, and the young caterpillars begin feeding on new tree leaves at the same time.

Many cities have implemented control measures to help combat invasive infestations. As a homeowner, however, you are responsible for protecting your own trees from any invasive species.

5 Things to Know About Invasives

  1. They threaten native wildlife and ecosystems by destroying or replacing native food sources.
  2. They push many native plants and animals to the brink of extinction.
  3. Invasives put 70 million acres of public and private lands at serious risk from 26 different insects and diseases, most of which are non-native invasives—according to the U.S. Forest Service (USFS).
  4. Cause ecological havoc: Some invasives are capable of changing ecosystems, such as changing soil chemistry or intensifying wildfires.
  5. They cost the U.S. billions of dollars in the effort to control or eradicate these invaders and restore habitats such as inedible lands, clogged waterways, and decimated commercial fisheries. Estimates are that the United States spends $138 billion per year in damage and associated control costs in the fight against invasives—according to the USFS .

Unfortunately, Beshoar says that invasives are here to stay. “Our challenge is to recognize which invasives need to be managed and how to effectively manage them.”

Consult your local tree expert for an invasives check on your property at

About the Author

The Davey Tree Expert Company provides research-driven tree services, grounds maintenance and environmental solutions for residential, utility, commercial and environmental partners across North America. As one of the largest employee-owned companies in the U.S., Davey has been dedicated to creating and delivering sustainable solutions for 140 years. Become part of the Davey legacy and apply today.

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