Ronald Herman Wilson, 49, administrator of the Asbury Methodist Home in Gaithersburg, where he worked for 22 years before retiring in 1981, died of pneumonia Oct. 1 at the Washington Hospital Center.

Mr. Wilson joined the staff at the Asbury Home in 1959 as assistant director under his father, the late Dr. Herman M. Wilson, a founder of the facility. He succeeded his father as director in 1963.

During Mr. Wilson's years as director, the population of Asbury grew from 175 to almost 1,000. Its capital funds increased from $5.5 million to more than $25 million, and an extensive building program was carried out.

Mr. Wilson was born in Takoma Park. He graduated from Gaithersburg High School and the University of Miami in Florida. He earned a master's degree in hospital administation at Northwestern University and a master's degree in English at Howard University.

He was a past president of the National Capital Area Association of Homes for the Aging. He was a trustee of the American Protestant Hospital Association and a member of the American College of Nursing Home Administrators, the civil advisory board of the Shady Grove Adventist Hospital and the Montgomery County Commission on Aging.

His marriage to the former Roberta Hudson ended in divorce.

Survivors include five children, Edward, Dianna and Rose Wilson, all of Ocala, Fla., Joanne Brisson, also of Ocala, and Carol Cruz of Miami; his mother, Mrs. Herman M. Wilson of Gaithersburg; two brothers, Dr. Robert J., of Gaithersburg, and John Randolph, of Westminster, Md.; and six grandchildren.