Search the Herbicide-Resistance Reference Database

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Sajedeh Golmohammadzadeh, Javid Gherekhloo, Antonia María Rojano-Delgado, M. Dolores Osuna-Ruíz,, Behnam Kamkar, Farshid Ghaderi-Far, Rafael De Prado. 2020. The First Case of Short-Spiked Canarygrass(Phalaris brachystachys) with Cross-Resistanceto ACCase-Inhibiting Herbicides in Iran. Agronomy 9 : 377 - .

The weedPhalaris brachystachysLink. severely affects winter cereal production. Acetyle-CoACarboxylase (ACCase)-inhibiting herbicides are commonly used to control this weed in wheat fields.Thirty-six populations with suspected resistance to ACCase-inhibiting herbicides were collectedfrom wheat fields in the Golestan Province in Iran. A rapid test performed in Petri dishes andwhole-plant dose–response experiments were conducted to confirm and investigate the resistancelevel ofP. brachystachysto ACCase-inhibiting herbicides. The seed bioassay results showed that0.02 mg ai L−1clodinafop-propargyl (CP) and 1.36 mg ai L−1of the diclofop-methyl (DM) solution werethe optimal amounts for reliably screening resistant and susceptibleP. brachystachyspopulations. In thewhole plant bioassay, all populations were found to be resistant to CP, resistance ratios ranging from2.7 to 11.6, and all of the CP-resistant populations exhibited resistance to DM. Fourteen populationsshowed low resistance to cycloxydim, and thirteen of these populations were also 2-fold resistantto pinoxaden. The results showed that DM resistance in someP. brachystachyspopulations is likelydue to their enhanced herbicide metabolism, which involves Cytochrome P450 monooxygenases,as demonstrated by the indirect assay. This is the first report confirming the cross-resistance ofACCase-inhibiting herbicides inP. brachystachysin Iran.

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, October 9, 2024 .  Available  www.weedscience.org
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