SMOOTH PIGWEED (Amaranthus hybridus)
with GROUP B/2 resistance: (ALS INHIBITORS)
Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)
MUTATION: TRYPTOPHAN 574 to LEUCINE


Smooth Pigweed (Amaranthus hybridus) is a dicot plant in the amaranthaceae family. A single amino acid substitution from Tryptophan 574 to Leucine has led to resistance to ALS inhibitors as indicated in the table below.

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Smooth Pigweed
ChemistryExampleResistance
ImidazolinonesImazethapyrResistant > 10 fold
PyrimidinylthiobenzoatesBispyribac-NaNot Determined
SulfonylureasChlorsulfuronResistant > 10 fold
TriazolopyrimidinesChloransulam-methylResistant > 10 fold
SulfonylaminocarbonyltriazolinoneFlucarbazone-NaNot Determined
NOTES
REFERENCES
Schmenk, R. E., M. Barrett, and W. Witt E. (1997). An investigation of smooth pigweed (Amaranthus hybridus L.) resistance to acetolactate synthase inhibiting herbicides. Weed Science Society of America Abstracts , 37 () : 117.
This case was entered by Patrick Tranel

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