The United States does not have a centralized government plant quarantine system. Instead, expert plant pathologists with proper containment facilities and approved protocols are issued permits by APHIS to manage quarantine programs for specific crops. Plants for propagation requiring quarantine, but that can not be processed elsewhere, are imported on behalf of the requestor by the USDA-APHIS Plant Germplasm Quarantine Program (PGQP) in Beltsville, MD.
Plant Quarantine Programs Regulated but not Managed by APHIS-PPQ
The programs listed below regularly import prohibited plant parts for propagation for many different requestors. Information for many of these programs is available at http://nationalcleanplantnetwork.org/
Citrus Quarantine Programs
Grapevine Quarantine Programs
Pome & Stone Fruit Quarantine Programs
Note: Pome and stone fruits released by the Canadian quarantine program in Sidney, BC or produced by the Canadian certification program can be imported into the U.S. without further federal quarantine restrictions.
Small Fruit Quarantine Programs
Corn, Millet and Sorghum Seed Quarantine Program
Wheat Seed Quarantine Program