International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
PROSTRATE PIGWEED (Amaranthus blitoides)

with GROUP B/2 resistance: (ALS INHIBITORS)
Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)
MUTATION: PROLINE 197 to SERINE







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

NOTE
With the exception of SU-resistance determination, cross resistance to the other classes was either not determined or determined from a single selective herbicide dose for a representative chemical of that class (and thus the level of resistance was not precisely determined).

REFERENCES

This case was entered by Terry Wright Email: trwright@dow.com
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, September 23, 2017 .  Available  www.weedscience.org
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