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  • Why are mosquitoes in my grass, shrubs, and garden?
    Mosquitoes go to these cooler, humid shady areas during the daytime to rest and escape the hot dry air that can quickly kill them. Maintaining your yard by cutting down tall grass and weeds will reduce the harborage areas and the number of mosquitoes in your yard.
  • Why are the mosquitoes so bad this year?
    Mosquitoes thrive in warm and wet conditions. When we have warmer conditions this means that the mosquitoes can emerge earlier and reproduce faster. In the right conditions, it takes a mosquito approximately two weeks to transform from an egg to an adult mosquito. Mosquitoes lay their eggs in water. Primarily we think of large bodies of water such as lakes, rivers, and ponds. However, mosquitoes can lay their eggs in any water receptacle. You can help reduce the mosquito breeding real estate by making sure you don't have any buckets, cans/bottles, frisbees, or even a shovel left out in your yard that would be capable of holding even a small amount of water as these provide the ideal location for mosquitoes to breed.
  • What attracts mosquitos to me?
    Carbon dioxide is the most universally recognized mosquito attractant and can draw mosquitos in from up to 35 meters away. Once a female mosquito is in the general vicinity of a host other cues can predominate such as body odors (sweat, lactic acid) and even heat. Visual stimuli, such as movement, can also factor into host-seeking.
  • What is a vector?
    A vector is a carrier of a disease or infection. Four Rivers Vector Control only deals with mosquitoes.
  • What can homeowners do to reduce mosquito bites?
    If possible, schedule your activities to avoid the peak mosquito times - usually dawn and dusk. You should also try to dress in light, loose-fitting clothing. If you must be out during the dawn and dusk hours make sure to wear a DEET or picaridin-based repellent.
  • Which repellent works best?
    DEET-based repellents work best at repelling mosquitoes. They also offer other DEET alternatives that work well such as picaridin which offers a close second to the effectiveness of DEET. DEET concentrations start out at 5% (provides approx. 90 minutes of protection) and go all the way up to 100% DEET (approx. 10 hrs. of protection). Pick a concentration level that will meet your outdoor activity. The American Academy of Pediatrics says that all family members over the age of two months can use DEET-based repellents with up to 30% concentration with confidence. Mosquito coils and Therma-Cell brand devices can also help provide some protection.
  • Can we eliminate mosquitoes?
    No, mosquitoes live in many different areas and habitats which makes it impossible to find and treat all the areas that they breed. Mosquito control is not intended to eliminate all mosquitoes but to reduce the amount of adult mosquitoes to minimize the possibility of people and animals getting sick from mosquito-associated diseases.
  • How long do mosquitoes live?
    Mosquitoes have an average adult life span that typically lasts 3-6 weeks.
  • How do I place a request for service?
    You can fill out the service request form found on the website or call us at the office. Our office phone is (541) 593-1689.
  • What is the Four Rivers Vector Control District?
    The Four Rivers Vector Control District was formed in 1985 by petition initiative and public hearing procedure in accordance with Oregon Revised Statutes 452.020. The district has the obligation to eradicate health vectors, (organisms capable of transferring diseases) wherever they may exist within the area. At present, the principal concern is to control the mosquito population which are found in large numbers throughout the district. Mosquito vector control districts are established to monitor and control mosquito populations in order to reduce the risk of mosquito-borne diseases, such as malaria, dengue fever, Zika virus, and West Nile Virus. Four Rivers Vector Control District conducts surveillance to monitor mosquito populations, identify potential breeding sites, and implement control measures such as larviciding, adulticiding, and source reduction to help reduce the number of mosquitos and prevent the spread of diseases.
  • When will you spray my neighborhood/street?
    We are actively working on the river and other waterways throughout the Four Rivers Vector Control District spraying for the mosquitoes. There are requirements set forth by the government that we must follow in order to spray for mosquitoes. We also perform landing counts (how many mosquitoes land/bite during a set period of time) to determine if we need to spray/fog for the mosquitoes. Once the threshold has been met we will spray/fog for the mosquitoes in specific areas.
  • Do all mosquitoes bite?
    Only adult female mosquitoes bite. Female mosquitoes need the protein found in the blood to produce eggs. During their aquatic stages, the mosquito larvae feed on algae and other small organic matter found in the water.
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