Vectors and Pathways

A winding road Transportation Related Pathways Diagram (PDF | 178 KB)

Diagram of transportation related pathways including all the various pathways related to the transportation of people and goods, such as miltary travel and transportation of military vehichles. Created by Don MacLean USFWS


Citrus Greening Information

USDA. Animal and Plant Health Inspection Service

Citrus greening is one of the more serious diseases of citrus. The bacterial disease is spread by the Asian citrus pysllid. This site provides links to news, national program and state partner information.


Fruit fly Living Industry Pathways (PDF | 186 KB)

Diagram of living industry pathways for the spread of invasive species; including all pathways associated with living organisms or their by-products. Created by Don MacLean, USFWS


A moose standing in water Diagram of Miscellaneous Pathways (PDF | 175 KB)

Pathways not covered under transportation or living industries, including biocontrol; other aquatic pathways; natural spread; and ecosystem disturbance. Created by Don MacLean USFWS


Worker unpacking screwworm films Vectors and Pathways Resource Lists

USDA, National Invasive Species Information Center
Resources related to pathways and risk assessment


Animal and Plant Health Inspection Service agency logo Risk and Pathway Analysis Program (PDF | 171 KB)

USDA. APHIS. Plant Protection and Quarantine. Center for Plant Health Science and Technology.

The Program focuses on collecting and interpreting scientific evidence and technical information regarding plant pest risks. This information is used to design risk-based policies and regulation for import, export, and domestic programs.