International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Status of Herbicide Resistance in India - Samunder Singh : January, 2014

Phalaris minor resistance is getting serious with full circle of multiple resistances to herbicides of different MOA starting from isoproturon to diclofop-methyl, fenoxaprop, clodinafop, sulfosulfuron, pinoxaden and premix of mesosulfuron+iodosulfuron (Atlantis). Both target site and enhanced metabolism are recorded in different populations of Phalaris minor from Haryana. There is no recommended herbicide which can provide effective control of all resistant populations. PRE (pendimethalin) followed by POE (ACCase/ALS) and tank or premix using metribuzin is providing some relief, but again there is regeneration in plants treated with metribuzin. Pyroxasulfone has been found effective against multiple herbicide resistant populations of P. minor; its field efficacy will depend on its large scale field use after recommendation/availability to the farmers.

Status of Herbicide Resistance in India - Rajender Chhokar : January, 2014

Littleseed canaqgrass (Phalaris minor Retz.), a troublesome weed of wheat in India, has evolved multiple herbicide resistance (MHR) across three modes of action: photoynthssis at photosystem II site A, acetyl-coA-carboxylase (ACCase) and ALS inhibition. The MHR (MHR) populations had a low level of sulfosulfuron resistance but high level of resistance to clodinafop and fenoxaprop. Some of the resistant populations have GR50 values for clodinafop 12 times higher than susceptible population. The multiple herbicide resistant populations (resistant to sulfosulfuron, clodinafop, pinoxaden and isoproturon) are susceptible to the triazine (metribuzin and terbutryn) and dinitroaniline (pendimethalin and trifluralin) herbicides. Triazine herbicides have selectivity problem in wheat and due to lack of knowledge and non availability of effective herbicides many farmers are facing severe yield losses due to multiple herbicide resistance.

Herbicide Resistant Weeds in India
Herbicide Resistant Weeds in India
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Herbicide Resistant Weeds in India
#SpeciesCommon NameFirst YearSite of Action
1 Phalaris minorLittle seed Canary grassIndia 199121 PSII inhibitor (Ureas and amides) (C2/7)
222
2 Phalaris minorLittle seed Canary grassIndia 199421 ACCase inhibitors (A/1)
7815
3 Phalaris minorLittle seed Canary grassIndia 200621 Multiple Resistance: 3 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
PSII inhibitor (Ureas and amides) (C2/7)
5324
4 Phalaris minorLittle seed Canary grassIndia 201321 ALS inhibitors (B/2)
7816
5 Rumex dentatusToothed DockIndia 201421 ALS inhibitors (B/2)
10949
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, October 18, 2017 .  Available  www.weedscience.org
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