Marin/Sonoma Mosquito & Vector Control District
800-231-3236 (toll free)
707-285-2200 (office)
595 Helman Lane, Cotati, CA 94931-9736

PHONE
800-231-3236 (toll free)
707-285-2200 (office)
707-285-2210 (fax)

ADDRESS
595 Helman Lane
Cotati, California
94931-9736

HOURS
Monday through Friday
7:00AM to 3:30PM

Yellowjackets become increasingly common in the late summer and fall. They can be especially agressive if disturbed or when defending their nest.

Every spring yellowjackets build new nests, beginning with a first generation of between 20 and 50 workers. By fall, the colony may total 2,000 to 5,000 or more. They all die during the winter except for the young queen females. The females overwinter in safe places and in the spring each one starts a new nest.

Most yellowjackets build their nests underground in abandoned gopher or squirrel burrows or other cavities. Sometimes they occupy spaces inside the walls of buildings, or hidden from sight in thick bushes or tree branches.

HOW TO AVOID YELLOWJACKET PROBLEMS

Pest yellowjackets are scavengers. They collect food from any available source.

• Place all food wastes in garbage cans with tight-fitting lids.
• Keep garbage cans away from picnic areas.
• Do not leave food uncovered.
• Eliminate water sources like dripping outdoor faucets or standing pools of water.

WHAT IF YOU FIND A NEST?

Nests can contain thousands of yellowjackets. If they are disturbed, they become extremely aggressive and can cause severe bodily injury. If you find a nest on your property and it becomes a nuisance contact the Marin / Sonoma Mosquito and Vector Control District to evaluate the situation.

HOW TO KEEP FROM GETTING STUNG

• Don't go barefoot.
• Don't swat a wasp with your hands.
• Keep lids on soft drinks.
• Check food before you put it in your mouth.
• Avoid using things that yellowjackets are attracted to, like:
  1. Perfumes
  2. Colognes
  3. Hairsprays
  4. Suntan lotion
  5. Brightly colored clothes

WHAT IF YOU DO GET STUNG?

Yellowjackets rarely sting if they are left alone. If you are stung, apply ice to the area to lessen the pain. Unlike honeybees, yellowjackets rarely leave a stinger imbedded in the skin.

If you show signs of an allergic reaction to the sting, like difficulty breathing or dizziness, contact your physician immediately.