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Response of Triallate-Resistant and -Susceptible Wild Oat (Avena fatua) Populations to Difenzoquat and EPTC in a Seedling Bioassay

Published online by Cambridge University Press:  12 June 2017

Abdur Rashid ,
John T. O'Donovan ,
A. Aziz Khan ,
M. Paul Sharma  and
Hai Van Nguyen
Abdur Rashid
Affiliation:
Alberta Research Council, Vegreville, AB, Canada T9C 1T4
John T. O'Donovan
Affiliation:
Alberta Research Council, Vegreville, AB, Canada T9C 1T4
A. Aziz Khan
Affiliation:
Alberta Research Council, Vegreville, AB, Canada T9C 1T4
M. Paul Sharma
Affiliation:
Alberta Research Council, Vegreville, AB, Canada T9C 1T4
Hai Van Nguyen
Affiliation:
Alberta Research Council, Vegreville, AB, Canada T9C 1T4
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Abstract

A seedling bioassay was used to determine the response of triallate-resistant (R) and -susceptible (S) wild oat populations to difenzoquat and EPTC. The bioassay, based on seedling shoot length at 10 d after treatment, provided a reliable and rapid means of determining if wild oat populations were resistant to difenzoquat. Using a bioassay concentration of 15 ppm difenzoquat, it was possible to identify populations that were resistant to the recommended foliar-applied rate (0.85 kg ai/ha). Expected herbicide dosages that reduced shoot length by 50% (ED50) derived from nonlinear regression analysis indicated three and two levels of response to difenzoquat among eight S and seven R populations, respectively, indicating within population variability in their response to difenzoquat. Of the populations tested, none was resistant to EPTC. On the contrary, some R populations had lower ED50 values than did S populations, suggesting an increased sensitivity to EPTC.

Keywords

Difenzoquat, 1,2-dimethyl-3,5-diphenyl-1H-pyrazoliumEPTC, S-ethyl dipropyl carbamothioatetriallate, S-(2,3,3-trichloro-2-propenyl) bis(1-methylethyl)carbamothioatewild oat, Avena fatua L. # AVEFAHerbicide resistancedifenzoquatEPTCtriallateAVEFABN, BentleyBH, BruderheimED50, dose required for 50% inhibitionFS, Fort SaskatchewanIH, Indian HeadLC-R, Lacombe-resistantLCS, Lacombe-SouthLC-S, Lacombe-susceptibleLCW, Lacombe-WestLB, LethbridgeLM, LloydminsterPO, PonokaR, resistantS, susceptibleSF, ScortfordSV, Spruce ViewSP, Stony PlainSC, Straight CreekTF, TofieldVV, Vegreville
Type
Research
Information
Weed Technology , Volume 11 , Issue 3 , September 1997 , pp. 527 - 531
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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