This map only represents pest survey data submitted to the NAPIS database by participating states for the year selected. This is not a distribution map; the map only displays one year of survey data at a time. CERIS and USDA-APHIS-PPQ do not certify the accuracy or completeness of this map.
If you wish to cite this map, please use the following format:
View Pest Information
- Center for Environmental and Research Information Systems (CERIS). Purdue University. "Survey Status of Horse thistle - Onopordum acaulon (2021).” Retrieved from https://pesttracker.org/map?code=PBFCNDA