Spring brings new growth across the Bay Area, but it can also signal the return of seasonal pests that impact both tree health and outdoor comfort. In the Peninsula and South Bay, one recurring issue property owners may encounter is increased activity from the Western tussock moth.
To help explain what to watch for and how to respond, we’re highlighting guidance from one of our partner companies serving the region.
Featured Insight from West Coast Tree Care
Western Tussock Moth: A Seasonal Pest to Watch in the Bay Area
In their recent article, the team at West Coast Tree Care outlines how Western tussock moth activity can affect both landscapes and day-to-day comfort during peak season. While this native pest is a regular presence in the region, population surges can lead to noticeable defoliation and unexpected skin irritation from the caterpillars’ fine hairs.
These caterpillars are most active in early spring, often appearing in large numbers on trees, shrubs, and even nearby structures. Their hairs can linger on surfaces and continue causing irritation even after the insects are gone.
The article further explores:
- How to identify Western tussock moth at each life stage
- Common host plants, including Coast Live Oak and understory species
- Why peak activity typically occurs between March and April
- The risks of skin irritation for people and pets
- How infestations can stress already vulnerable landscapes
- Treatment options, including foliar applications and trunk injections
- Why early intervention is key to effective control
👉 Read the full article from West Coast Tree Care
Seasonal pest activity is a predictable part of maintaining healthy landscapes, but proactive monitoring and timely treatment can prevent minor issues from escalating. Addressing infestations early helps protect both plant health and the usability of outdoor spaces.
At Canopy Service Partners, we are proud to support partner companies like West Coast Tree Care, whose science-based approach to plant health care helps property owners manage regional pest pressures effectively.
For homeowners and property managers across the Bay Area, early-season inspections can provide clarity, reduce exposure risks, and support long-term landscape resilience.
