Why doesn’t Tri-County Health Department spray for mosquitoes?
Tri-County Health Department’s role is education of the public and surveillance of the
presence of diseases. Traps are set in locations with the highest historical mosquito activity
and regularly monitored for the species of mosquitoes known to carry West Nile Virus
(WNV). Those mosquitoes are separated out and sent to the state lab for testing for WNV. If
there are surges in the mosquito populations or testing comes back positive for WNV, the local
municipality or county agency, which is responsible for the treatment of the area, is notified,
and they focus on larvaciding (killing the mosquito before it develops into an adult) as a
principle means of controlling the mosquito populations. Only in extreme cases, would there
be any need to spray (called adulticiding), as larvaciding has been proven to be the most
effective method at controlling mosquitoes.

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1. Why doesn’t Tri-County Health Department spray for mosquitoes?
2. How do I report a problem with mosquitoes?
3. There is standing water on my neighbor’s property and it is breeding mosquitoes. What can be done?
4. Are “mosquito magnets” beneficial?
5. Prairie dogs keep coming into my yard. What do I do?
6. Isn’t it a “health hazard” when prairie dogs, rabbits, or other small mammals come into my yard?
7. I have an old shed on my property that needs to be cleaned out. Since I live in the metro area, do I really need to be concerned about Hantavirus?
8. I have seen several dead birds on my property in the last few days. What do I do?
9. I found a dead bat outside my home. Does it need to be tested for rabies?
10. There have been several dead rabbits near my home lately. Should this be a concern?
11. There is a prairie dog village next to my home, and there haven’t been any prairie dogs lately. Is this a concern?