SPRAYING WITH MALATHION

Aerial spraying of 22 square miles of Los Angeles with the pesticide malathion begins at 9 tonight in an effort to stop the spread of the Mediterranean fruit fly. Later plans call for release of sterile flies. Here is what county officials are telling residents about the pesticide:

Safety. Malathion is a commonly used home, garden and orchard pesticide. Doctors in England use it in the treatment of body and head lice. Evacuation is not recommended, although people should stay indoors during the spraying.

Past Use. Malathion has been used in higher concentrations than will be used here for mosquito and pest control. In 1980-81, it was used to control the Medfly, drawing protests about safety.

Pregnancy/Respiratory Ailments. No harm is expected. A medical hot line has been set up for special consultation at (818) 350-1929.

Skin Contact. Wash with soap and water.

Pets. Malathion should not affect pets that normally stay outdoors, but it is toxic to fish, and fish ponds should be covered.

Cars. Malathion can damage certain types of car paint. Drivers may want to cover cars left out of garages or wash the cars.

Boundaries. Between Washington and Firestone boulevards south of downtown Los Angeles, from Santa Fe Avenue on the west to Garfield Avenue on the east.