The following were among actions taken by the Fairfax County Board of Supervisors at its Feb. 22 meeting. For more information, call 246-3151.

GYPSY MOTHS -- County staff members denied charges by an environmental group that county plans to spray 51.7 square miles of the county with Dimlin and two other chemicals to kill gypsy moths this spring could endanger other animals and residents.

In 1987, gypsy moths defoliated 10 acres in the county, but officials said there has been a ten-fold increase in moth eggs since then.

The Washington-based Environmental Task Force has charged that there are too few moth eggs in the area to justify using Dimilin, which they say could kill other animals and possibly cause cancer in human beings.

In a report to the Board of Supervisors, however, county officials wrote that the U.S. Department of Agriculture found that human beings in areas sprayed with Dimilin suffered a cancer risk 100 to 1,000 times less than the risk of smoking two cigarettes in a lifetime or eating six pounds of peanut butter in a lifetime. They denied that Dimilin would render vegetables unfit to eat, noting that it easily washes off vegetables, quickly passes through the body if eaten and does not enter plants through their roots.

The spraying, to begin in April or May, will cover more than 100,000 lots. Residents will be notified in March by letter if their property is to be sprayed. Residents who do not wish their property sprayed may write to the Fairfax County Department of Extension and Continuing Education, at 11242 Whaples Mill Rd., Fairfax, Va. 22030.

CHILD ABUSE -- The board voted unanimously to create a citizens' committee on child abuse, after a task force concluded the county needs to do more to treat victims.

The task force, led by School Board Chairman Mary Collier, praised the county for hiring new employees for child abuse programs, hiring a child abuse program coordinator and seeing victims quickly during a crisis. It also praised the increasing the number of after-school day care slots at county schools. But it found that there is a waiting list for some programs, and the county has no residential or hospital programs for sex offenders.

WEST SPRINGFIELD PARKING -- The board voted to restrict daytime parking on streets near West Springfield High School to residents only, after the school's neighbors complained students parked in front of their houses block driveways and litter the area.

The board noted that the county school driver education program will soon stop using the school parking lot during the day, freeing 50 spaces for students. The school system is considering acquiring more land for parking near the school.

LORTON INCINERATOR -- The board voted 7-to-1 to approve the sale of $252 million in bonds to build an incinerator near Lorton, despite objections from neighbors and Mount Vernon Supervisor Gerald Hyland (D-Mt. Vernon).

Deputy County Executive Denton Kent said the plant's controls for removing toxic chemicals from smoke will be superior to almost any other in the country.