Newsletter-Sunriver HOA Spring 2026
Four Rivers Vector Control District (FRVCD) Update for Sunriver Owners Association Residents
Working together for a more comfortable, bite-free season
As we move into another beautiful Central Oregon spring and summer, the Sunriver Owners Association (SROA) has once again partnered with Four Rivers Vector Control District (FRVCD) to provide comprehensive mosquito control services from April through Labor Day. We’re excited to continue this collaboration and to share some updates about what’s new this season—and what you can expect.
A New Season, A Renewed Approach
FRVCD is operating under a new Board of Trustees and updated management, with a strong focus on improving service quality while increasing efficiency. We are also working in coordination with TRMVC (Three Rivers Mosquito & Vector Control) through contracted services to enhance operational capacity and coverage across the district.
Our approach remains grounded in science and best practices:
- Primary focus: Larval control (stopping mosquitoes before they fly)
- Secondary response: Adult control (fogging) when populations reach nuisance or health thresholds
Why focus on larvae? Because every mosquito we stop before it becomes an adult is one less mosquito looking for a blood meal—yours.
Early Season Activity: A Warm Start
Due to an unusually mild winter and early warm temperatures (70–80°F days), we observed a noticeable increase in mosquito activity as early as March. These were not newly hatched mosquitoes, but rather overwintering adults emerging from diapause (a type of hibernation).
The good news: a return to freezing temperatures and snow helped reduce those early populations naturally.
Meanwhile, our field teams got to work:
- Inspections and larval treatments began in March
- Swamping areas, wetlands, and river edges were surveyed and treated
- Catch basins were identified as active breeding sites and treated accordingly
The “Little Things” Matter (A Lot)
During neighborhood inspections, staff identified several small but highly productive mosquito sources:
- Ornamental ponds
- Unattended water features
- Even 5-gallon buckets
Each of these seemingly minor water sources can produce thousands of mosquitoes.
👉 What you can do:
- Walk around your property—and nearby homes if neighbors are away
- Dump or drain any standing water
- If you find something that cannot be emptied, submit a service request and we’ll take care of it
Stopping mosquitoes at the source is the most effective (and environmentally friendly) control method.
Tools of the Trade: From Boats to Drones
Our teams are actively working throughout the SROA and surrounding areas:
- Boats are now in the water (since the 3rd week of April) to access river-edge breeding sites
- ATVs and side-by-sides are used to treat ditches, pathways, and golf course areas
-
Drones (yes, drones!) are now part of our toolkit
- These 55-pound units can treat multiple acres per flight
- They offer greater precision than helicopters and improved efficiency over ground crews
If you see a drone in operation, please give it space—for safety, we avoid flying near spectators.
What We’re Using (and Why)
All products currently being applied are naturally occurring or biologically derived, with a strong emphasis on:
-
Bti (Bacillus thuringiensis israelensis)
- A naturally occurring soil bacterium
- Targets mosquito larvae specifically
- Harmless to people, pets, fish, and beneficial insects
You’ll most often see us applying these treatments during the daytime.
When You See Fogging
Starting in May, you may occasionally see trucks or ATVs conducting adult mosquito control (fogging):
- Typically done late in the evening
- Timed to minimize impact on beneficial insects like pollinators
- Conducted when mosquito populations reach higher levels
Important note:
While the products used are considered relatively safe, we pause applications when pedestrians are present. To ensure full coverage (and avoid untreated gaps), please consider stepping indoors briefly if you see fogging in your area.
Stay Connected & Report Issues
We’ve launched a new service request system to make it easier for residents to report:
- High mosquito activity
- Standing water concerns
- Potential breeding sites
👉 If you notice an issue, please report it using the provided link.
We appreciate your patience as we work on updating our website, which—full transparency—is currently under construction. The new site will offer:
- Real-time updates
- Educational resources
- Service tracking and more
Final Thoughts (and a Light Reminder)
Mosquito control is a community effort. Our teams can treat large areas, but the smallest water source in a backyard can undo a lot of that work.
So remember:
- If it holds water, it can hold mosquitoes
- If it can’t be dumped, we can help
- And if you hear a faint buzz… it’s probably not just your imagination
If you have any questions, concerns, or just want to learn more about what we do, please don’t hesitate to reach out. We’re here to help make your summer in Sunriver as enjoyable—and bite-free—as possible.
– Four Rivers Vector Control District (FRVCD)