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A Seedling Bioassay for Assessing the Response of Wild Oat (Avena fatua) Populations to Triallate

Published online by Cambridge University Press:  12 June 2017

John T. O'Donovan ,
Abdur Rashid ,
Hai Van Nguyen ,
Jeff C. Newman ,
Aziz Khan ,
C. Ian Johnson ,
Robert E. Blackshaw  and
K. Neil Harker
John T. O'Donovan
Affiliation:
Alberta Environ. Cent., Vegreville, AB, Canada T9C 1T4
Abdur Rashid
Affiliation:
Alberta Environ. Cent., Vegreville, AB, Canada T9C 1T4
Hai Van Nguyen
Affiliation:
Alberta Environ. Cent., Vegreville, AB, Canada T9C 1T4
Jeff C. Newman
Affiliation:
Alberta Environ. Cent., Vegreville, AB, Canada T9C 1T4
Aziz Khan
Affiliation:
Alberta Environ. Cent., Vegreville, AB, Canada T9C 1T4
C. Ian Johnson
Affiliation:
Alberta Environ. Cent., Vegreville, AB, Canada T9C 1T4
Robert E. Blackshaw
Affiliation:
Agric. and Agri-Food Canada, Lethbridge, and Lacombe, AB
K. Neil Harker
Affiliation:
Agric. and Agri-Food Canada, Lethbridge, and Lacombe, AB
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Abstract

Germinated seeds of wild oat populations that were susceptible (S) or resistant (R) to triallate at the recommended soil-applied rate (1.7 kg/ha) were treated with six triallate concentrations on filter paper in petri dishes. Measurement of shoot length 8 d after treatment provided an accurate indication of differences among populations, and was more reliable than determining shoot fresh weight. ED50 values (herbicide concentrations that reduced shoot length by 50% relative to untreated controls), derived from nonlinear regression analysis, indicated four and five levels of response to triallate among eight S and seven R populations, respectively. The ED50 values varied from 0.11 to 11 ppm a.i. triallate for the most susceptible to the most resistant populations, respectively. Routine testing of wild oat samples suspected of resistance, at triallate concentrations of 0.5 or 1 ppm in the petri dish bioassay, effectively identified populations that had become resistant to the recommended soil-applied rate.

Keywords

Triallate, S-(2,3,3-trichloro-2-propenyl) bis(1-methylethyl)carbamothioatewild oats, Avena fatua L. # AVEFAHerbicide resistancetriallatepetri dish bioassayAVEFA
Type
Research
Information
Weed Technology , Volume 10 , Issue 4 , December 1996 , pp. 931 - 935
Copyright
Copyright © 1996 by the Weed Science Society of America 

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