Ernest Neal Cory, 92, a faculty member of the University of Maryland for 47 years and a former chairman of its department of entomology, died of arteriosclerotic heart disease Wednesday at his home at Corn Island, Md.

Dr. Cory, who was born in Takoma Park, became interested in insects and agriculture while he worked on a ranch in Arizona to recover from an eye injury he incurred in high school. He later enrolled at the Maryland Agricultural College, now the University of Maryland, and graduated in 1909. He became an instructor and remained on the faculty until his retirement in 1956.

Entomology is the study of insects and Dr. Cory was particularly interested in the economic impact insects can have on agriculture. He helped develop the insecticide DDT and also developed the milky disease spore dust, which helps control the Japanese beetle.

Dr. Cory served as Maryland state entomologist and as entomologist for the Maryland agricultural experimental station, which he helped establish. He also was entomologist of the state agricultural extension service.

A member of the American Association of Economic Entomologists, he served as its president in 1947. From 1936 to 1953, he was secretary-treasurer and business manager of the Journal of Economic Entomology. He was made an honorary member of the Entomological Society of America a year after its founding in 1953.

In 1926, Dr. Cory helped found the Marine Biology Institute at Solomons Island, Md. In the same year, he earned a doctorate in entomology from American University.

Following his retirement from the University of Maryland, Dr. Cory spent a year working in British Guiana, now Guyana. Since then he has devoted much of his time to gardening at his home at Corn Island. He also was a watercolorist and his work was exhibited in 1958 at the Cosmos Club, of which he was a lifetime member.

Dr. Cory's wife, the former Elizabeth Colton Elder, died in 1965.

Survivors include a daughter, Mrs. Richard T. Blackwell, of Delevan, Wis.; two sons, Ernest Jr., of Corn Island, and William Robert, of Louisville, Ky.; eight grandchildren, and eight great-grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the Dr. Ernest Neal Cory Scholarship Fund, College of Agriculture, University of Maryland.