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Diclofop Resistance in Wild Oat (Avena fatua)

Published online by Cambridge University Press:  12 June 2017

Olufunmilayo O. Joseph ,
Shaun L.A. Hobbs  and
Sakti Jana
Olufunmilayo O. Joseph
Affiliation:
Dep. Crop Sci. and Plant Ecol., Univ. Saskatchewan, Saskatoon, Canada S7N 0W0
Shaun L.A. Hobbs
Affiliation:
Dep. Crop Sci. and Plant Ecol., Univ. Saskatchewan, Saskatoon, Canada S7N 0W0
Sakti Jana
Affiliation:
Plant Biotechnol. Inst., Nat. Res. Counc., Saskatoon, Canada S7N 0W9
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Abstract

The differences in tolerance, morphology, and physiological response of diclofop-resistant and -susceptible wild oat biotypes collected from fields in Saskatchewan, Canada, were investigated under growth room and field conditions. Under herbicide-free conditions the resistant biotype had more upright leaves with about 12% less leaf area and 50% less leaf width than the susceptible biotype. A marked difference in the level of tolerance to diclofop was observed. Photosynthesis was initially significantly reduced in both biotypes after treatment with diclofop at the rate of 0.70 kg ai ha−1, but the resistant biotype was able to recover. Injury to the susceptible biotype was reduced by coating the seeds with 1,8-naphthalic anhydride. Differential foliar retention was not an important factor in selectivity of diclofop among the two biotypes.

Keywords

Diclofop (±)-2-[4-(2,4-dichlorophenoxy)phenoxy]propanoic acidwild oat, Avena fatua L. # AVEFAPhysiological responseretentionselectivitynaphthalic anhydrideAvena fatuaAVEFA
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 38 , Issue 6 , November 1990 , pp. 475 - 479
Copyright
Copyright © 1990 by the Weed Science Society of America 

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