Vector Control

Pathways to control invasive diseases in island birds

Vector Control

The U.S. Fish and Wildlife Service’s Pacific Islands office and the Hawai’i Department of Land and Natural Resource’s (DLNR) Division of Forestry and Wildlife have been working with other conservation partners to understand and apply novel mosquito control techniques in Hawai’i to help maintain and expand dwindling populations of Hawai’i’s native forest birds. These forest birds are severely threatened by avian malaria, a disease primarily vectored by the non-native mosquito Culex quinquefasciatus. Working with various partners, the Hawai’i Team has reviewed emerging vector control techniques/technologies that can be applied at a landscape scale. The Hawai’i Team’s current focus is the development of a mass rearing pipeline for C. quinquefasciatus infected with Wolbachia, a bacterium known to cause cytoplasmic incompatibility (i.e. sterility after mating). Releases of these mass reared mosquitoes will then be used to reduce populations of wild C. quinquefasciatus in forest bird refugia using an integrated pest management approach with emphasis on the Insect Incompatibility Technique (ITT Wolbachia). Although capacity will be developed for the mass rearing and release of Wolbachia infected C. quinquefasciatus, management can be modified easily to incorporate more efficient technologies for mass rearing and release as they are developed and approved to address other non-native mosquito species known to be vectors of public health diseases in Hawai’i.

In 2016, the management approach was further refined and reviewed at multiple workshops, including one co-organized by the Hawai’i Team and the Hawai’i Exemplary State Foundation. This workshop was convened in order to represent and review the technologies as well as develop collaborations with governmental and non-governmental organizations within and outside of Hawai’i. The outcome of the workshop further reinforced the necessity and feasibility of C. quinquefaciatus control in Hawai’i, as well as the control of other mosquito species (workshop report). Following this workshop in early 2017, the Hawai’i Invasive Species Council, an inter-departmental collaboration of all of Hawai’i’s government state agencies passed resolution 17-2 “Supporting Evaluation and Implementation of Technologies for Landscape-Scale Control of Mosquitoes, With a Focus On Mitigating Both Human and Wildlife Health Risks).

The Hawai’i Team continues to partner and collaborate with various government and non-governmental institutions, which include: Hawai’i Department of Land and Natural Resources, Hawai’i Department of Health, Hawai’i Exemplary State Foundation, American Bird Conservancy, Revive and Restore, Verily, The Nature Conservancy, Hawai’i Conservation Alliance, Hawai’i Invasive Species Council, Defense Advanced Research Projects Agency, Department of Defense, U.S. National Park Service, and U.S. Geological Service.

This group is currently seeking funding to assess Cytoplasmic Incompatibility in Hawai’i strains of C. quinquefasciatus, A. aegypti, and A. albopictus by the research teams.  The Hawai’i strains of these species will then be introgressed with the various lab strains to develop Hawai’i specific Wolbachia infected strains of the species. Additionally, funding will be used for a DLNR planner position that will help to expedite work in Hawai’i. View video and press release about this technique here.

State of Hawai’i Department of Health has some great resources about limiting mosquito habitat in your backyard.

See Avian Disease and Fall 2016 Newsletter.

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