Emerald Ash Borer Treatment in Lawrence and Topeka

Emerald ash borer was first found in Kansas in 2012 and is now confirmed in thirteen northeast Kansas counties according to K-State Research and Extension. If you own an ash in Douglas or Shawnee County, the question is not whether the insect reaches your tree. It is whether you are treating the tree or budgeting to remove it.

The adult beetle does almost nothing. The larvae are the problem. They hatch under the bark and tunnel S-shaped galleries through the phloem, the layer that carries sugars from the leaves down to the roots. Enough galleries and the tree is girdled from the inside while the bark still looks intact from the outside.

Green ash was planted heavily across Topeka and Lawrence through the second half of the last century, often as the replacement for the elms lost to Dutch elm disease. White ash shows up in older yards. Both are susceptible, and both are worth identifying before you decide anything, because the ash nobody knew was an ash is the one that surprises the owner in year four.

Work this list from the top of the tree down. Emerald ash borer kills from the top because the larvae start in the upper trunk and branches where the bark is thinner, and the canopy dies back in that same order.

By the time you can see exit holes from the ground, the tree has usually been infested for several years. That does not automatically mean it is too late, but it does mean the clock has been running longer than you thought.

Treatment is a systemic insecticide injected directly into the trunk at the base, where the tree's own vascular system carries it up into the canopy. Larvae feeding under the bark take it in with the tissue they are eating. Injection puts the product inside the tree rather than into the air or the soil, which matters on a property with a vegetable garden, a well, or pollinator plantings.

A trunk injection lasts about two years. Then it needs doing again, and it needs doing again for as long as you want the tree. This is not a one time cure, and anyone presenting it that way is either misinformed or selling. An ash on treatment is an ash on a maintenance schedule, the same way a roof is on a replacement schedule.

Dose scales with trunk diameter, because a twenty inch ash holds roughly twice the wood of a ten inch ash and needs roughly twice the product. HomeGuide puts trunk injection at $10 to $15 per inch of trunk diameter, or $75 to $250 per tree, with a single treatment lasting one to two years. That is a national planning figure, not a quote on your tree.

The rough industry threshold is straightforward. Under about thirty percent canopy loss, treatment is usually worth it and the tree generally holds. Between thirty and fifty percent it is a judgment call that depends on the tree's value, its position, and how vigorous the remaining canopy looks. Above about fifty percent, treatment is money spent on a tree that is not coming back, and the conversation should turn to removal timing.

The reason to be blunt about that line is that the tree does not pause while you think it over. An ash that crosses fifty percent this July will be considerably worse next July, and the cost of dealing with it climbs as it goes.

Value is a real part of the calculation and it is yours to weigh. A thirty inch green ash shading the west side of your house is worth treating indefinitely. A twelve inch ash in the back corner of the lot with nothing under it is usually worth removing now and replanting with something that does not need an injection every other year.

Dead ash does not behave like other dead hardwood. It goes brittle fast, and the wood loses the ability to hold a climber or take the shock loading of a rigged limb. A green ash that could have been climbed and dismantled in a day two years ago becomes a tree that has to come out from a bucket or a crane, with a bigger crew and a longer day.

That difference lands directly on the invoice. Angi puts a crane requirement at roughly $500 and up in added cost, and difficult access adds another 25 to 50 percent on top of that. A removal that was routine while the tree was alive can become one of the more expensive jobs on a residential property once it is dead and brittle.

Decide before the tree decides for you. If you are removing it, remove it while it can still be climbed. If you are treating it, start while the canopy is still mostly there.

Budget by diameter. HomeGuide's $10 to $15 per inch of trunk diameter is the most honest way to project a treatment cycle, because it is how the work is actually quoted and it scales with the tree. Run a tape around the trunk at chest height, divide the circumference by 3.14, and you have your diameter.

Treating several ash on the same visit costs less per tree than treating them one at a time, since most of the cost of a visit is the visit. Streets in Lawrence and Topeka planted with a row of ash sometimes coordinate treatment across several properties for exactly that reason.

We will tell you when a tree has crossed the line and stopped being worth treating. Selling a two year injection cycle on an ash that is sixty percent gone is easy money and we do not take it.