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Wild Oat (Avena fatua) Populations Resistant to Triallate Are Also Resistant to Difenzoquat

Published online by Cambridge University Press:  12 June 2017

John T. O'Donovan ,
M. Paul Sharma ,
K. Neil Harker ,
Denise Maurice ,
Mirza N. Baig  and
Robert E. Blackshaw
John T. O'Donovan
Affiliation:
Pest Management Program, respectively, Alberta Environmental Centre, Vegreville, Canada T9C 1E2
M. Paul Sharma
Affiliation:
Pest Management Program, respectively, Alberta Environmental Centre, Vegreville, Canada T9C 1E2
K. Neil Harker
Affiliation:
Agric. Canada Res. Stn., Lacombe, Alberta
Denise Maurice
Affiliation:
Weed Res., Alberta Agric. and Rural Dev., Edmonton, Alberta
Mirza N. Baig
Affiliation:
Monsanto Canada, Inc., Edmonton, Alberta
Robert E. Blackshaw
Affiliation:
Agric. Canada Res. Stn., Lethbridge, Alberta
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Abstract

In response to farmer complaints of poor triallate performance, wild oat seed was collected from 34 fields in Alberta in the fall of 1990. Screening trials in the greenhouse indicated that 15 of the populations were highly resistant to triallate applied at the equivalent of the recommended field rate (1.7 kg ha-1), whereas the other 19 populations were adequately controlled. All triallate-resistant populations were also highly resistant to difenzoquat applied at 1.7 kg ha-1 (equivalent to twice the recommended field rate). The effect of increasing rates of both herbicides on dry weight of five of the resistant and two of the susceptible populations was determined in greenhouse experiments. Triallate applied up to 3.4 kg ha-1 had little or no effect on the resistant populations, whereas the susceptible populations were controlled at 1.7 kg ha-1. At rates of 6.8 kg ha-1 or higher, there were differences among the resistant populations and among individuals within the populations in the response to triallate. Response of the resistant populations to increasing difenzoquat rates was variable between experiments, but in all cases the effect of difenzoquat on wild oat dry weight was considerably less in triallate-resistant than triallate-susceptible populations. Effects of increasing rates of triallate and difenzoquat on resistant and susceptible wild oat populations growing with barley in field experiments were generally similar to the responses in the greenhouse.

Keywords

Triallate, S-(2,3,3-trichloro-2-propenyl)bis(methylethyl)carbamothioatedifenzoquat, 1,2-dimethyl-3,5-diphenyl-1H-pyrazoliumwild oats, Avena fatua L. # AVEFAbarley, Hordeum vulgare L. ‘ Winchester’ (Vegreville), ‘ Leduc’ (Lacombe)Herbicide resistancecross-resistanceED50field historiesAVEFA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 42 , Issue 2 , June 1994 , pp. 195 - 199
Copyright
Copyright © 1994 by the Weed Science Society of America 

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