Tussock Moth and ISP Treatment in Colorado

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Tussock Moth and ISP Treatment Services

Tussock moth outbreaks in Colorado can be devastating if left untreated. Act early with professional ISP treatment to safeguard your trees and maintain a healthy, beautiful landscape.

What is the Tussock Moth?

Tussock moths are a group of moth species known for their hairy caterpillar stage, which can become a significant pest to trees and shrubs. The caterpillars feed on the foliage, sometimes causing severe defoliation that stresses trees, weakens growth, and makes them susceptible to disease and other pests.

Common tussock moth species that affect trees include:

  • White-marked tussock moth
  • Douglas-fir tussock moth
  • Hickory tussock moth

These caterpillars are typically active during spring and early summer.

What is ISP Treatment?

ISP treatment stands for Insecticidal Spray Program (ISP), a targeted approach for managing and controlling various foliar pests such as tussock moth caterpillars. ISP treatments use carefully selected insecticides that are effective against larvae and caterpillars but minimize harm to beneficial insects and the surrounding environment.

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Tussock Moths Help in Denver CO

Why Treat for Tussock Moths?


  • Protect Tree Health: Heavy feeding by tussock moth caterpillars can defoliate trees, reducing photosynthesis and vital energy reserves.
  • Prevent Long-Term Damage: Repeated defoliation weakens trees, making them more susceptible to other pests, disease, and environmental stress.
  • Control Population Growth: Timely ISP treatment helps reduce caterpillar numbers before they can cause significant damage or reproduce.
  • Preserve Landscape Value: Defoliated trees lose aesthetic appeal and can diminish property value.

How Does ISP Treatment Work?

  • Assessment: Root Tree Service's certified arborists inspect your trees to identify the presence and severity of tussock moth infestations.
  • Targeted Application: We apply insecticides specifically formulated to control tussock moth caterpillars while preserving beneficial insects like pollinators.
  • Timing: Treatments are scheduled to target the larval stage when the caterpillars are most vulnerable, typically in early to mid-spring.
  • Follow-Up: We monitor the effectiveness of the treatment and provide additional applications if necessary to fully protect your trees.