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Hairy beggerticks photo 1
Hairy Beggarticks is a common source of Bidens mottle virus in the southern US.

Hairy beggerticks photo 2
Hairy Beggarticks leaves, left infected with Bidens mottle virus, right leaf is healthy.

Photos courtesy of T.A. Zitter, Cornell University, Ithaca, NY

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Link to the Checklist of Major Weeds and Crops as Natural Hosts for Plant Viruses in the Northeast

Link to Photo Gallery of Major Weeds as Natural Hosts for Plant Viruses in the Northeast