Columbia subject headings:
Harvard subject headings:
Agricultural pests--United States.
Insect pests--Biological control--United States
Insect pests--United States.
Pests--Biological control--United States.
Princeton subject headings:
Agricultural pests--United States.
Insect pests--Control--Biological control--United States.
Insect pests--United States.
Pests--Control--Biological control--United States.