CHARACTERISTICS:

  • Adult no-see-ums are less than 1/8 inch long
  • Gray in color
  • Two wings have dense hairs and give rise to pigmentation patterns
  • Large, compound eyes
  • Have a 15-segmented antennae
  • Mouthparts with cutting teeth on elongated mandibles in the proboscis
  • Females are blood suckers, males are not
  • Thorax extends slightly over the head
  • Abdomen is 9-segmented and tapered at the end

WHAT ATTRACTS NO-SEE-UMS?

  • Carbon Dioxide from the breaths of animals and humans
  • Nightlights
  • Slow-moving or still water
  • Damp areas, including decaying vegetation, mud, and the water that collects in tree holes, old tires, and various containers
  • Warm areas
  • Highest part of the body

EFFECTS OF NO-SEE-UM ACTIVITY ON HUMANS AND ANIMALS:

  • Primarily, they are a nuisance to humans
  • Can cause allergic reactions in humans from the bites
  • No-See-Ums transmit viruses in animals such as Epidemic Hemorrhagic Disease (EHD) to deer and the bluetongue virus in sheep
  • No recorded cases of transmitting pathogens to humans in California
  • Individuals bitten from No-See-Ums may experience intense itching, swelling, and in sensitive individuals, seeping ulcerations that may last for several weeks

PREVENTION OF NO-SEE-UM BITES:

  • Install proper screening for windows and patios to prevent them from entering residences and outdoor areas used for leisure
  • Ceiling and window fans can be used at high speeds to keep them out of small areas due to them being weak fliers
  • Wear light-colored clothes when you are outside
  • Wear protective clothing covering exposed skin
  • Do not wear perfumes or sweet-smelling lotions
  • Use insect repellent sprays, creams, roll-on sticks, and lotions containing Diethyl-meta-toluamide (DEET).

TREATMENT OF NO-SEE-UM BITES:

  • Ice packs, cleaning bite site with soap and water recommended.
  • Seek Physician advice for itching