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Oregon Coast National Wildlife Refuge Complex
Pacific Region


May 2, 2014
Coos County to begin treating Refuge with mosquito larvicide
Bandon, Ore. - Coos County Public Health will begin ground application of Bacillus thuringiensis israelensis, or Bti, on Bandon Marsh National Wildlife Refuge starting this weekend, May 3-4, 2014. Bti is a naturally derived larvicide that kills mosquitoes in their aquatic immature life stages as they hatch in breeding pools. Bti targets mosquito larvae and is not toxic to bees, moths, butterflies, fish, mammals, or birds. The granular formulation will be applied by hand and backpack spreaders and restricted to areas within the Ni-les’tun Unit of the Refuge.

“Bti will effectively control mosquitoes on the Ni-les'tun Unit of the Refuge while posing a low risk to wildlife, their habitats, and the human environment. Coos County Public Health will be treating the refuge as needed throughout the summer, as determined by ongoing monitoring, to prevent larvae from developing into adults.” stated Refuge Project Leader Roy Lowe.

Funding, provided by the Service, was previously released to Coos County Public Health for monitoring and application of larvicide. The County has hired a field technician to monitor for mosquitoes on the Refuge throughout the spring and summer in concert with Refuge employees. The County has also contracted with Vector Disease Control International to apply the larvicide Bti, as needed.

Treatment of mosquito larvae could not move forward until the appropriate permitting and legal planning documents, like the two recently finalized environmental assessments, were completed. The two EAs comprise the Integrated Marsh Management Approach to control mosquitoes at the refuge through long-term habitat modification and mosquito control treatments. The channel creation work in the tidal marsh to eliminate mosquito breeding habitat is scheduled to begin in early summer 2014.

The Service evaluated and responded to comments received on the EAs. This information, the environmental assessments and more are available for review on the refuge’s mosquito web page

Coos County Public Health:
Posted by the Oregon Coast National Wildlife Refuge Complex Staff at 3:57 PM in Category: Bandon Marsh NWR
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