Ash Tree Borers:
Ash trees are one of the most common landscaping trees in Colorado. Unfortunately, they have a list of insect predators that has resulted in the loss of thousands of trees across the state.
First, a word about treatment. It’s possible for a strong, healthy tree to withstand an infestation. Trees that receive the right amount of sun, water and fertilization and that are properly pruned have fewer weak spots for wood boring insects to take advantage of. Strong bark and a robust nutrient delivery system is also a good defense against insect infestation.
Trees that are already infested aren’t a lost cause, but application of insecticide requires perfect timing and precise application. Homeowner application can be an exercise in futility if the correct chemical isn’t applied at the correct time. With ash borers becoming a real danger, professional treatment can be a smart investment.
And now, the ash tree protectors’ most wanted list:
Lilac/ash borer – The lilac/ash borer, along with the emerald ash borer, is considered a major ash borer. Because it’s native to North America, it’s the most common ash borer.
Emerald ash borer – Recently spotted in Longmont, the emerald ash borer made its way to the U.S. through exports from Asia. It has worked its way east, leaving a path of destruction behind it.
Flatheaded appletree borer – Despite its name, the flatheaded appletree borer is happy to make itself at home in an ash tree. Along with the redheaded ash borer, the pigeon tremex and ash bark beetles, the flatheaded appletree borer is considered a minor ash borer. That is, it’s less of a threat. However, if an ash is weakened enough, even a minor ash borer can cause damage.
Redheaded ash borer – This insect has a red head, legs and shoulders and because of its striped body, it’s often mistaken for a wasp. This borer is more of a cleanup insect. It’s not considered a major threat because it usually sticks to ash trees that are beyond saving. Its continued boring hastens decomposition.
Pigeon tremex – Another cleanup insect, the pigeon tremex can be found at work in a variety of decaying hardwoods.
Ash bark beetles – Ash bark beetles have a reputation for destroying already weakened limbs, but don’t often destroy entire trees.
All of the ash borers on the most wanted list tunnel into trees to lay their eggs. Weakened areas of trees are first on their list, but for an entire tree that is stressed or weakened, any area is fair game. After eggs hatch, larvae eat their way through the tree. Adults emerge in mid- to late spring to mate and start a new circle of life.
If you have healthy ash trees and want to keep them that way or you suspect an ash borer infestation, SprayTech, Colorado insect treatment specialists, can help. Contact them at 720-248-0000 to discuss preventive measures and treatment.
