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Oregon Coast National Wildlife Refuge Complex
Pacific Region


May 21, 2014
Coos County treats Bandon Marsh with mosquito larvicide
Bandon, Ore. – The Ni-les’tun Unit of the Bandon Marsh National Wildlife Refuge was treated with Bacillus thuringiensis israelensis, or Bti, from May 17-20, 2014. The granular formulation of Bti was applied by hand and backpack spreaders. All tidal marsh areas where mosquito larvae exceeded set threshold levels were treated. Monitoring will be ongoing to determine when Bti treatment is necessary.

“Coos County and the Service are continuing to work cooperatively on mosquito monitoring and treatment. Bti will be applied as needed based on the presence of larvae in the Ni-les’tun Unit.” said acting refuge manager Madeleine Vander-Heyden.

Funding, provided by the Service, was previously released to Coos County Public Health for monitoring and application of larvicide. The County hired a field technician to monitor for mosquitoes on the Refuge and nearby areas throughout the spring and summer. The County has also contracted with Vector Disease Control International to apply the larvicide Bti as needed. Bti is a naturally derived larvicide that kills mosquitoes in their aquatic immature life stages. Bti targets mosquito larvae and is not toxic to bees, moths, butterflies, fish, mammals, or birds.

The Service purchased 16 mosquito traps for loan to Coos County. Four were delivered to the City of Bandon on May 19 and the other 12 will be arriving by the end of the month. The city and the Coos County Vector Control Advisory Committee are expected to determine trap placement. Additionally, the Service will provide a grant of three thousand dollars to a local nonprofit who will work with the Coos County Vector Control Committee to build and deploy bat boxes around the community.

Treatment of mosquitoes with larvicide is part of the Integrated Marsh Management Approach to control mosquitoes at the refuge through long-term habitat modification and mosquito control. Tidal channel creation to eliminate mosquito breeding habitat is scheduled to begin in early summer 2014.

For updates on the Integrated Marsh Management Approach at Bandon Marsh Refuge:
Coos County Public Health:
Posted by the Oregon Coast National Wildlife Refuge Complex Staff at 3:16 PM in Category: Bandon Marsh NWR
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