horseweed

Common Name: horseweed
Scientific Name: Conyza canadensis
Life Cycle: annual
Family: Asteraceae
Chromosome Number: Not Reported
Polidy level: 2X
Genome Size (1C Mbp): 440
Center of Origin as reported by Mabberley (1998) or Randall (2002): North America
Number of Sites of Action to which species is currently reported as resistance: 5
Sites of action to which herbicide resistance has been reported: PSII inhibitor (C1/5), PSI Electron Diverter (D/22), EPSP synthase (G/9), ALS inhibitor (B/2), PSII (Ureas and amides (C2/7)
Images source: Scott McElroy
lastUpdated: 02/11/2018