About ½ inch in length
Dark brown or black with numerous white bands on the body and legs
It can be stated, most confidently, that the mosquito is the bane of man’s existence when it comes to
human and animal relations. No other creature has caused mankind so much annoyance, grief and disaster than
this blood-feeding pest. The mosquito not only takes our blood in order to provide nutrients to make eggs,
which is an annoyance resulting in minor pain and itching, but it can leave behind serious health threats
such as viruses, protozoans, and other disease-causing pathogens. The mosquito is actually a type of fly
with a thin body, thin wings and long legs. The females are easily recognized by the long thin proboscis,
or mouthparts, extending from the bottom front of the head. Only the female mosquito bites; male mosquitoes
feed on the nectar in flowers. When a mosquito bites, she injects an anticoagulating agent into the skin to
prevent the blood from clotting and allowing her to feed. It is the body’s immune response to the
anticoagulant that causes the reddened welts and itching. People have varying reactions to mosquito bites,
with some individuals experiencing rather large welts and severe itching. Mosquito-borne disease is likely
the number one cause of death in developing countries, and it has many times been instrumental in changing
the course of history. Fortunately, the United States is fairly free of mosquito-borne diseases except for
various types of encephalitis, most notably West Nile Virus (WNV) in recent years. Birds serve as the
environmental reservoir for WNV. Some bird species, such as crows and blue jays, are killed by the virus,
while many other species are relatively unaffected. Mosquitoes feeding on infected birds pick up the virus
and can subsequently transmit WNV to people and to horses.
Asian tiger mosquito larvae breed in standing water that remains fairly calm and undisturbed. Larvae are
common along the edges of a pond or a ditch, but they will not be found in a quick-running stream or creek.
As a rule of thumb, any water that stands for at least seven days can breed mosquitoes. Often, mosquito
outbreaks occur within two weeks of heavy rainfall where ditches, puddles and other low-lying areas fill up
with water. Mosquitoes that attack people in their own yard are usually
breeding close by on the property or adjacent properties. Most mosquitoes found around homes are known as
“tree hole” or “container” mosquitoes. This species does not breed in a natural body of water, rather the
female seeks out accumulated water in hollows in trees; in water-capturing plants such as bromeliads; or in
manmade containers such as bird baths, barrels, cans, clogged gutters and old
tires. Smaller children’s swimming pools and regular swimming pools
that are not well maintained can also serve as a source for mosquitoes.
Complete control or elimination of Asian tiger mosquitoes around any property is not possible.
Mosquito reduction, however, is very possible and involves a number of components: Habitat Reduction –
Getting rid of any item that could contain water and hold it for more than seven days needs to be
- Empty and refill birdbaths at least once per week.
- Drill holes in the bottom of tire swings to prevent rainwater from accumulating.
- Avoid using barrels or other containers to capture rainwater unless the container is emptied every
- Empty children's "kiddie" pools regularly.
- Examine gutters regularly. Conditions, such as debris or loose guttering, should be corrected.
- Fill in accessible tree holes with a material that will not harm the tree. Check with a local
nursery for advice.
- Use soil to fill in low areas in lawns and landscaped areas that allow rainwater to collect and
stand for more than seven days.
- Install an agitator in garden ponds used in landscaping or buy fish that eat mosquito larvae. The
wave actions created by an agitator can prevent mosquito adults from successfully emerging from
Controlling Mosquito Larvae — For properties that have ditches, small ponds or decorative garden ponds,
environmentally friendly mosquito larvicides can be applied to the water by a pest professional in areas in
which mosquitoes can breed.
- The insect growth regulator (IGR), methoprene, affects only insects, interfering with a mosquito
larva’s ability to pupate into an adult. IGR products are generally applied about once every 30 days to
help reduce mosquito populations.
- Bacterial mosquito control products that affect only mosquito larvae also can be used, but such
products require specific timing in order to obtain maximum results.
Controlling Adult Mosquitoes — The best way to limit mosquitoes is to prevent adult mosquitoes from
developing by eliminating or treating breeding sources as described above. Because some adult mosquitoes
are most likely always going to be present, treatments can be applied around a home to control as many as
- A pest professional can apply residual products to shrubs and other vegetation around the home and
yard. Since mosquitoes spend most of their time during the day resting in vegetation, such treatments
can effectively reduce mosquito populations. Such treatments need to be periodically reapplied during
the warm months when mosquitoes are active.
- Some of the mosquito traps available commercially do attract and capture large numbers of
mosquitoes. Concern may exist that such traps may draw mosquitoes from adjacent properties, so locating
the trap at the perimeter of the property is preferable to placing it next to the patio, deck, etc.
where people are active.