Hawaii has mosquitoes as well as the smaller no-see-um biting gnats. They are more prevalent in rainy areas and also wherever there’s less concrete.
Mosquitoes are responsible for diseases including Malaria, West Nile Virus, Yellow Fever and Japanese Encephalitis.
Luckily, Hawaii hasn’t been effected by West Nile Virus, although all of the 48 mainland states have.
The Hawaii State Department of Health is at heightened awareness for mosquito borne diseases, especially inasmuch as two of the species which carry dangerous viruses live here in the islands.
In 2002, there was an outbreak of dengue fever in Hawai’i, with the majority of cases on Maui. More than 100 people contracted the disease. We have had no further outbreaks since then.