A more thorough explanation:

The Animal and Plant Health Inspection Service (APHIS) is an agency within the United States Department of Agriculture. Its main responsibility is to control or eliminate pests and plant diseases by regulating the shipment of agricultural products within the United States.

APHIS was established in 1977, and some of its functions were transferred to the U.S. Department of Homeland Security in 2003. The agency plays a crucial role in protecting the nation's food supply and agricultural resources from pests and diseases that could harm crops, livestock, and the environment.

• APHIS inspects imported plants and animals to ensure they are free from pests and diseases that could harm U.S. agriculture.
• The agency regulates the movement of fruits and vegetables across state lines to prevent the spread of plant diseases.
• APHIS works with farmers and ranchers to develop and implement pest management strategies that are safe and effective.

These examples illustrate how APHIS works to protect the nation's agriculture from pests and diseases. By regulating the movement of plants and animals, and working with farmers to develop pest management strategies, the agency helps to ensure a safe and secure food supply for all Americans.