Virtuss®

Dual-Species Biological Control for Tussock Moth Management

Virtuss is a unique baculovirus-based biological insecticide developed for the management of both Douglas-Fir Tussock Moth (Orgyia pseudotsugata) and White-Marked Tussock Moth (Orgyia leucostigma). Manufactured by Andermatt Canada, Virtuss provides effective control of two important defoliating pests using a single biological solution, helping forestry professionals and land managers protect forests, woodlands, and ornamental plantings.

When feeding larvae ingest treated foliage, the virus infects and replicates within the insect, causing disease and mortality. Its dual-species activity makes Virtuss a valuable tool for sustainable forestry and integrated pest management programs.

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Product Facts

Target Pests
Douglas-Fir Tussock Moth (Orgyia pseudotsugata)
White-Marked Tussock Moth (Orgyia leucostigma)

Crops/Use Sites
Forests, woodlands, and ornamental plantings

Application Timing
Target early instar larvae for optimal control.

Mode of Action
Larvae ingest foliage treated with Virtuss. Following ingestion, the virus infects and replicates within the insect. Infected larvae typically become sick within 5 – 7 days and mortality occurs approximately 9 days after ingestion.

Active Ingredient
Baculovirus complex targeting Orgyia pseudotsugata and Orgyia leucostigma

Application Method
Ground or aerial application

Storage and Shelf Life
Store below 5°C and use within 5 months of the date of manufacture.

Country of Manufacture
Canada

SDS
Label

Tech
Sheet

Product
Label

Key Product Benefits

Early Larval Control

Designed for application against young feeding larvae, when control is most effective.

Ground and Aerial Application

Suitable for a range of forestry and landscape management programs.

Supports Resistance Management

Offers a unique biological mode of action that complements integrated pest management strategies.

Population-Level Impact

Natural transmission within pest populations can contribute to broader suppression beyond directly treated larvae.

Low Environmental Impact

Non-hazardous biological formulation with minimal impact on non-target organisms.

Made in Canada

Developed and manufactured in Canada for North American forestry applications.

Target Pest Information

White-Marked Tussock Moth

(Orgyia leucostigma)

White-Marked Tussock Moth is a widespread defoliator found across North America. Larvae feed on a broad range of deciduous and ornamental trees, including maple, birch, oak, willow, and fruit trees. Heavy infestations can cause noticeable defoliation and stress to host plants. Monitoring populations and targeting young larvae can help reduce feeding damage and support long-term forest and landscape health.

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Protect Forests and Ornamentals from Tussock Moth Damage

Contact our team to learn more about integrating Virtuss into your forestry, woodland, or ornamental pest management program.

Disclaimer

Performance information for Virtuss® is based on internal trials, field observations and/or publicly available data. Results may vary depending on pest pressure, application timing, environmental conditions, and local management practices.

Always read and follow label directions and applicable regulatory requirements. This website does not replace product labels, technical documentation, or application recommendations.