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U.S. Department of Agriculture
National Invasive Species Information Center
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Invasive Species Resources

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Animal Disease Information - Disease Images: Avian Influenza
Iowa State University. Center for Food Security and Public Health.
ARS Image Gallery
USDA. Agricultural Research Service.
Image Gallery is provided as a complimentary source of high-quality digital photographs available from the USDA's Agricultural Research Service, Office of Communications.
Asian Carp Photos

Asian Carp Regional Coordinating Committee; Flickr.
Asian Carp Photos and Videos

Asian Carp Regional Coordinating Committee.
CalPhotos - Centaurea calcitrapa
University of California - Berkeley. Digital Library Project.
CalPhotos - Lepidium appelianum
University of California - Berkeley. Digital Library Project.
CalPhotos - Linaria genistifolia ssp. dalmatica
University of California - Berkeley. Digital Library Project.
CalPhotos - Linaria vulgaris
University of California - Berkeley. Digital Library Project.
Citrus Canker Photos

Florida Department of Agriculture and Consumer Services. Plant Industry.
Citrus Health Response Program - Symptoms of Citrus Greening Infection
USDA. APHIS. Plant Protection and Quarantine.

Includes images for citrus greening, insect vectors of citrus greening, and foliar symptoms of feeding by African Citrus psyllid
EPPO Global Database - Phyllosticta citricarpa - Photos

European and Mediterranean Plant Protection Organization.
Google Images - Africanized Honey Bee
Google.
Google Images - Air Potato
Google.
Google Images - Alder Dieback
Google.
Google Images - Alewife
Google.
Google Images - Alligatorweed
Google.
Google Images - Asian Citrus Psyllid
Google.
Google Images - Asian Clam
Google.
Google Images - Asian Gypsy Moth
Google.
Google Images - Asian Longhorned Beetle
Google.