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FRVCD Board of Trustees meeting Wednesday, June, 14th.
5:30 pm

Contact the district office for more info

Four Rivers Vector Control District

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About Four Rivers Vector Control District

Four Rivers Vector Control District is a Special Service Taxing District formed in 1985.  We serve the public in a 25 square mile area in Southern Deschutes County.  Four Rivers Vector Control District provides a professional program of Integrated Mosquito Management that allows citizens to enjoy outdoor activities while also reducing the threat to public health.

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Mosquito Surveillance

Surveillance of Adult mosquitoes is a very important part of the FRVCD. It is used to measure mosquito populations, which may trigger a control method, determine the efficacy of the control method and to gather them for West Nile virus testing.  We use physical "landing counts" and traps. The traps will be set with bait and dry ice. When the mosquitoes are drawn in by the C02, they are sucked into a sample net and held in by the fan.  The next day we will pick them up, identify, sort by species and count them.  After the mosquitoes are sorted the Vector species are tested for the presence of disease.  They are sent to Oregon State University for testing at their lab.

Larval Mosquito Control

The Four Rivers Vector Control District has a very aggressive Larvicide program. Mosquitoes spend their first 3 stages of its life as an egg, larva and pupa, it is our goal to control as many as we can in the aquatic stage.  FRVCD is divided up into 20 zones and within these zones there are over 1300 larval sites. Licensed applicators routinely inspect these sites and treat the infected sources.  We primarily use a Biological Larvicide called B.T.I.  The district uses a helicopter, boat and a hand crew.


For more information on mosquitoes click here

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Adult Mosquito Control

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When Mosquitoes reach the threshold of 3 or more mosquitoes in 10 minutes Four Rivers may adulticide. This must be done between last light and dawn at a temperature of 55 degrees or higher.  Adulticiding is used when mosquitoes reach the threshold or in the presence of disease. Each Ultra Low Volume fog truck is equipped with a GPS tracking unit. This allows us to keep detailed visual records of each Application.  We use Permethrin mixed with mineral oil at a rate of 1.2 oz. per acre.  To report a mosquito infestation scroll down, look at our treatment area map then fill out a report.

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Four Rivers Vector Control District Treatment Area Map

We do not control mosquitoes outside this boundary

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If you live in the Four Rivers Vector Control District Treatment area and have a mosquito complaint report it here.  All complaints are checked frequently and we will get your area taken care of as soon as possible.  It is not necessary to fill out this report and call us.  

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