Tag emerald ash borer

To keep your trees healthy it is recommended to have your tree assessed by an ISA Certified Arborist every year. They are able to spot issues that a homeowner may miss. Below are some common issues to intercept before they become costly problems for your trees.

Structural

Trees may have natural structural issues or may develop them in response to stress or other factors. Aside from breaking and falling limbs, trees can also develop instabilities in the root system.

Physical damage

Everything from nearby landscape maintenance to reckless driving can be a source of physical damage to a tree. Generally, the more damage is done to the bark and the layers just underneath it, the more impact damage will have on a tree’s health.

While trees cannot “heal” in the same way that animals can, there are ways that trees respond to wounds and can minimize the internal damage. A tree’s wound response does not usually need human intervention, and applying wraps or compounds is not usually necessary or advised.

Weather/Environment

North Texas is known for unpredictable, and often severe, weather. Storms, droughts, freezes, and high winds are just a few of the weather events we are used to. Properly preparing trees for the weather, and dealing with the effects of severe events is an important part of caring for trees.

Insects/Pests

Depending on the species, age, and location of a tree, it may be a target for many different insects, arachnids, and other pests. Some that are comon in North Texas are:

•  Aphids
• Bagworm
• Pecan phylloxera
• Emerald ash borer – a recent arrival to North Texas, but a serious threat to ash trees
• Cankerworm
• Twig girdler

Diseases/fungi

As with pests, a tree’s susceptibility to disease depends on several factors. Some of the common North Texas tree diesases are:

• Oak wilt
• Chlorosis
• Fungal activity
• Oak leaf blister
• Oak decline
• Leaf spot
• Chinese pistache fungal affliction

Cycle of decline

No matter the particular type, all trees suffer from stress, pest activity, and potential for diseases. The factors contributing to a tree’s ability to recover from stress, damage, or infection range from the weather at a given moment to the genetic makeup of the particular tree.

Trees with certain underlying predispositions may react very differently to stress when compared to trees without those underlying factors.

Trees that have suffered recent damage may be less able to fight off an infection.

When considering the health of a tree, it is important to keep in mind the “cycle of decline,” the recurrent effect of internal and external factors have on a tree’s ability to maintain vigor and health.

Physical damage or poor soil conditions do not only have an immediate effect on a tree’s health, but factor in whenever a new stressor presents itself.

Failure to address these factors can hasten tree decline and death.

Additional Resources

The International Society of Arboriculture has guide of Tree Hazards

At Texas Tree Surgeons, we love trees and we love our community! We hope this blog on common tree issues will help prevent tree failure. We have additional resources on our North Texas Tree Owner’s Guide. If you would like immediate assistance with your trees please contact us today.

North Texas Tree Owner’s Guide

• Tree Selection
• Tree Planting
• Tree Care
• Common Tree Issues
• Getting Help with Your Trees

As previously reported, the emerald ash borer beetle (EAB) has been making its way into North Texas in recent years. In 2016, specimens were found in Harrison County, Texas, near the Louisiana border. By 2018, the beetle had spread to Tarrant County. By 2022, EAB had been confirmed to be present in eight Texas counties: Bowie, Cass, Dallas, Denton, Harrison, Marion, and Tarrant. These areas are now under a Texas Department of Agriculture quarantine that restricts the movement of ash trees and tree materials, as well as firewood from all hardwood species, unless properly handled or treated.

While not the most common tree in our North Texas urban forest, ash species do make up 5-13% of the trees in the DFW area. While EAB poses a serious threat to the health of ash trees, there are preventative measures that can help slow the spread of the beetle and protect unaffected trees.

How Do I Tell If I Have Ash Trees?

Ash tree identification can be a little tricky if you are not used to it. Many North Texas can easily spot the distinctive leaf shapes of many oaks or maples, but the leaves of ash trees may cause them to be identified as pecans or other trees with similar leaf structures. One distinctive feature of ash trees is the seed pods that appear in the fall, and can be seen spiraling down as they drop to the ground.

• There are several types of ash tree seen in North Texas; most commonly:

  • Arizona ash (Fraxinus velutina or Fraxinus berlandieria)

  • Green/red ash (Fraxinus pennsylvanica)

  • Texas ash (Fraxinus albicans Buckley or Fraxinus texensis)

• All ash varieties have similar characteristics:

• Compound leaves

• Tan to gray fissured bark

• Unique seed pods

If you are unsure about what kind of trees you have, contact a local certified arborist who can help with identification.

What Should I Do about EAB If I Have Ash Trees?

With the spread of the emerald ash borer beetle, ash tree owners need to be particularly mindful of the state of their trees.

• Preventative insecticide treatment can be effective

  • Must be administered before EAB is present

• Diseased or damaged ash trees should be removed

  • EAB is attracted to the dead/dying wood and points of decay

• Watch for signs of EAB

  • Dieback in upper canopy

  • Shoots/suckers along branches

  • Splitting/shedding bark with insect trails (“galleries”) underneath

  • Increased woodpecker activity

  • D-shaped holes in or under bark

• EAB-infested trees

  • Once EAB is present, little can be done

    • Insecticide can slow decline in some cases

    • If more than 50% of canopy is dead, treatments are not effective

  • EAB kills trees in 2-5 years

EAB and Freeze-Damaged Trees

Trees in North Texas have been stressed by the freezing weather in recent years and are therefore more susceptible to pests of all kinds, including EAB. Dead branches in the crown of a tree may be a holdover from freeze damage or may be a sign of an infestation. Proper after-freeze care can help a tree regain its health and vigor, but any stressed ash trees should be assessed by an ISA Certified Arborist to ensure that EAB is not present. Preventive systemic insecticides are strongly recommended for stressed ash trees.

The tree on the right was treated with preventative EAB pesticide. The tree on the left was not treated due to frost damage. Both were exposed to EAB.

At Texas Tree Surgeons, we love trees and we love our community! The continuing spread of emerald ash borer in North Texas is a serious threat to our urban forest. Our arborists are staying up-to-date with guidance from the Texas A&M Forest Service and the Texas Department of Agriculture to provide the highest level of care to our customers. If you have ash trees, even if they look healthy, give us a call to discuss whether preventative treatment is recommended for your area. If you have sick or stressed trees of any species, we offer full-service plant health care programs and can give your trees the best chance to survive and thrive. Get in touch today!