International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
SMOOTH PIGWEED (Amaranthus hybridus (syn: quitensis))

with GROUP B/2 resistance: (ALS INHIBITORS)
Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

Chemical FamilyExample HerbicideResistance Level
ImidazolinonesImazethapyr Resistant > 10 fold
PyrimidinylthiobenzoatesBispyribac-Na Resistant > 10 fold
SulfonylureasChlorsulfuron Intermediate Resistance < 10 fold
TriazolopyrimidinesChloransulam-methyl Intermediate Resistance < 10 fold
SulfonylaminocarbonyltriazolinoneFlucarbazone-Na Not Determined

Different biotypes harboring the Ser653Asn mutation varied substantially in response to some herbicides. In particular, resistance ratios for chloransulam-methyl ranged from 0.08 (sensitive) to 10. See Whaley et al. (2006) for details.


This case was entered by Patrick Tranel Email:
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, September 23, 2019 .  Available
Copyright © 1993- 2019 All rights reserved. Fair use of this material is encouraged. Proper citation is requested.