Pest Library

Human Head Lice

CHARACTERISTICS

Size:

About 1/8 inch in length.

Color:

Grayish

Behaviour

The occurence of head lice is somewhat common among school-age children, particularly those in primary schools. Younger children are more likely to wrestle, hug and sleep close together, or share hats, clothing, brushes and combs-- all methods by which head lice might be transferred from person to person. For this reason, head lice are a concern to most parents.

Head lice begin their lives as eggs ir "nits." The term "nitpicking" originated from the painstaking effeorts required to go through a person's hair to remove head lice and thier eggs. The female louse attaches each egg to the base of hair near the scalp. One female can deposit 80 to 100 eggs during her lifetime. Nits are somewhat oval and have a cap on the top through which the nymph will emerge. They are often confused with globules of hair spray on hairs, but an experience eye can easily distinguish the difference. If the nit is founfd one inch or further from the scalp, it is likely already hatched or is dead.

The eggs hatch in approximately seven to nine days and the nymphs begin feeding on blood through scalp. The nymph will molt three times before maturing ainto and adult-- a process completed in eight to nin days. Adults may live about three weeks or a bit longer.

Because lice generally feed at night, infected persons will experience the most discomfort and itching while trying to sleep.

Habitat

the human head louse is almost exclusively found living within the hairs of the human head. Lice can survive short periods on hats, brushes, combs, pillows or towels. They will, however, die within 24 to 48 hours of the host.

Tips for Control

The present of head lice is a medical issue and should be diagnosed and treated by a physician. Typically, a physician will prescribe a louse control shampoo or similar product. Also, a fine-toothed comb may be used to help remove lice and some nits from hairs. It is important to note that the label directions of any louse control product should be strictly followed. Reports of concerned or panicked parents applying such products daily or at higher than label-directed dosages have occured. Such misuse of these products is potentially unsafe for the lice-infested person; much like taking a higer dose of medication than recommend by a physician is unsafe.

A pest management professional can do nothing to help in dealing with this insect. The premises do not require treatment. Noninfested family members should share combs, brushes,hats, towels or bedding with infested person until that person's louse infestation has been eliminated. Use hot water and detergent to wash bedding, clothing, towels, etc, that have been in contact with an infested person. Combs and brushes can be boiled for a minute or so in water and then washed thoroughly with sopan and water.

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