Invasive Tree-Damaging Insects in Colorado

Maintaining the health and vitality of trees is a critical aspect of preserving the natural beauty and ecological balance in Colorado Springs and Castle Rock. Unfortunately, these regions are not immune to the threat of invasive insect species that can wreak havoc on the local tree populations. In this blog post, we will delve into some of the most invasive and damaging bug species that pose a significant threat to trees in these areas.

1. Mountain Pine Beetle

(Dendroctonus ponderosae): Colorado's iconic pine trees, such as lodgepole and ponderosa pines, are under constant threat from the mountain pine beetle. These insects burrow beneath the bark, introducing a fungus that blocks the tree's water-conducting vessels. Infested trees exhibit reddish-brown needles, a telltale sign of their struggle, and stand vulnerable to wildfires due to the dry conditions they create.

2. Douglas-Fir Tussock Moth

(Orgyia pseudotsugata): The Douglas-fir tussock moth targets Douglas-fir trees, common in Colorado landscapes. The caterpillars of this moth defoliate trees by consuming their needles, leaving them weakened and susceptible to diseases and other stressors. Outbreaks of these moths can result in significant deforestation and a visible impact on the local ecosystem.

3. Bronze Birch Borer

(Agrilus anxius): Birch trees, valued for their distinctive bark and graceful appearance, are at risk from the bronze birch borer. These beetles lay eggs on the bark, and their larvae bore into the tree's vascular tissues, disrupting nutrient flow. Infected birches exhibit dieback in the crown, yellowing leaves, and eventually, the entire tree may succumb to the damage.

4. Spruce Budworm

(Choristoneura spp.): Spruce budworms are notorious defoliators of spruce and fir trees in Colorado. These caterpillars feed on new growth, causing significant defoliation and weakening the trees. Repeated infestations can lead to reduced growth and susceptibility to other stressors like drought and disease.

5. Lilac Ash Borer

(Podosesia syringae): The Lilac Ash Borer is a lesser-known but equally concerning threat to ash trees, which are widespread in Colorado Springs and Castle Rock. These borers target weakened or stressed ash trees, especially those that have been compromised by other factors like drought or disease. The adult borers lay eggs on the bark, and the resulting larvae tunnel beneath the bark, disrupting the tree's nutrient and water transport system. Infested ash trees display canopy dieback, thinning leaves, and other signs of decline.

6. Emerald Ash Borer

(Agrilus planipennis): Although this beetle has yet to be discovered in Colorado Springs or Castle Rock it has been discovered in Denver and could be on its way south at anytime. The emerald ash borer is a notorious invader that targets ash trees, which are prevalent in Colorado Springs and Castle Rock. Originally from Asia, these metallic green beetles lay their eggs on ash trees, and their larvae bore into the inner bark, disrupting the tree's ability to transport nutrients and water. This leads to the decline and eventual death of infected trees if left unchecked.

Protecting the rich tree diversity in Colorado Springs and Castle Rock requires vigilance and proactive measures to combat the threats posed by invasive insect species. Regular tree inspections, proper care practices, and early intervention are essential in mitigating the damage caused by these tree-damaging bugs. If you ever suspect or notice any abnormalities please do not hesitate to contact Tall Timbers Tree and Shrub Service and we will happily pair you with with one of our Certified Arborists and provide you with a complimentary inspection of your trees and shrubs.