Richard Hansen, richard.w.hansen@aphis.usda.gov, USDA-APHIS-PPQ, Natl. Weed Mgmt. Lab, 2301 Research Blvd, Suite 108, Fort Collins, CO
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Species 1: Acari Eriophyidae
Aceria anthocoptesSpecies 2: Asterales Asteraceae
Cirsium arvense (Canada thistle)
Recorded presentation