Plant quarantine is a technique for insuring disease- and pest-free plants by isolating them during a period while performing tests for the presence of these problems.

In the United States, the Animal and Plant Health Inspection Service

Animal and Plant Health Inspection Service

Animal and Plant Health Inspection Service is an agency of the United States Department of Agriculture responsible for protecting animal health, animal welfare, and plant health. APHIS is the lead agency for collaboration with other agencies to protect U.S. agriculture from invasive pests and...

 (APHIS) retains this function although the agency’s closely allied border inspection function was transferred to the Department of Homeland Security (DHS) by P.L. 107-296.