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Performance of Imazethapyr on Pulse Crops

Published online by Cambridge University Press:  12 June 2017

Najib Malik  and
Lawrence Townley-Smith
Najib Malik
Affiliation:
Agric. Canada Res. Stn., Melfort, Sask. SOE 1AO
Lawrence Townley-Smith
Affiliation:
Agric. Canada Res. Stn., Melfort, Sask. SOE 1AO
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Abstract

The potential of imazethapyr as a selective herbicide in four pulse crops was investigated at Melfort, Saskatchewan in 1988 and 1989. Lentil, field pea, faba bean and annual vetch were tolerant to imazethapyr applied preemergence to a silty clay loam soil at 0.05, 0.10, 0.15, and 0.20 kg ai ha-1. Postemergence treatments above 0.05 kg ha-1, however, stunted lentil and vetch in both years. Environmental factors, the dominant weed in the experimental site, as well as timing of application strongly influenced the performance of imazethapyr. Seed yield increases observed with imazethapyr treatments, compared to metribuzin or untreated check, were greater in 1989 when wild oat was the dominant weed and moisture was not a limiting factor in the early stages of crop development, than in 1988 when field pennycress was the dominant weed. Mean seed yield for all imazethapyr treatments, compared to the check, increased 0 and 930%, 24 and 89%, 21 and 600%, and 47 and 44% in 1988 and 1989, for lentil, field pea, faba bean and vetch, respectively. Significant increases in lentil seed density, seed size, and germination were also obtained though protein content decreased 2%.

Keywords

Imazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidmetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)1,2,4-triazin-5(4H)-oneannual vetch, Vicia sativa L.faba bean, Vicia faba L. ‘Orion’field pea, Pisum sativum L. ‘Century’lentil, Lens culinaris L. ‘Eston’field pennycress, Thlaspi arvense L. ♯3 THLARwild oat, Avena fatua L. ♯ AVEFACrop toleranceherbicideseed qualityseed yieldweed controllentilfield peafaba beanannual vetch
Type
Research
Information
Weed Technology , Volume 4 , Issue 4 , December 1990 , pp. 791 - 798
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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