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Posted on: May 16, 2017

City begins mosquito control efforts


The City of Portland is set to begin preventative measures to help control the mosquito population during mosquito season. We encourage residents to implement mosquito control efforts at their own homes as well.

Trained City Staff will be using chemical fogging to help control the mosquito population. Truck-mounted spraying will be conducted on an ongoing basis, depending on the insect population and weather conditions.  Spraying cannot be conducted in rain or mist and can only be accomplished when winds are less than 10 miles per hour. To the extent possible, City staff typically will schedule spraying between 8:30 p.m. and midnight, and 4:00 to 6:30 a.m., when fewer people and pets are outdoors.  Currently, the City of Portland utilizes two adulticides—Mosquitomist ONE ULV (access Safety Data Sheet
here) and Biomist 4 4 ULV (access Safety Data Sheet here).

Mosquito spraying cannot eliminate mosquitoes completely. The City asks that residents take action to help prevent mosquito infestation as well. Residents should empty and replace outside water sources for pets daily to prevent ingestion of sprayed chemicals. Other outdoor areas of standing water should be eliminated, when possible, to decrease favorable mosquito breeding conditions. These include planters, buckets, tires, children’s swimming pools, gutters, etc. Environmental Protection Agency-approved larvicide briquettes to place in detention basins and abandoned pools are available for residents to purchase at hardware and home improvement stores .  

Mosquitos are most active at dusk and dawn. Residents can protect themselves from mosquito bites by applying an insect repellant containing DEET and by wearing protective clothing.
Visit to read the mosquito spraying FAQs, view the Portland mosquito control route map, and learn more about mosquito bite prevention and techniques to control the mosquito population at your home.  For more information about City of Portland mosquito control efforts, please call the Public Works office at (361) 777-4601.


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