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Corn Cockle (Agrostemma githago) Competition in Winter Wheat (Triticum aestivum)

  • D. J. Rydrych (a1)

Abstract

The experiment was conducted during 3 yr to measure the effect of corn cockle (Agrostemma githago L.) competition on winter wheat (Triticum aestivum L. ‘McDermid’) grain yield. In all years corn cockle was removed monthly in separate treatments from emergence (October) to harvest (July). Hand-weeded and weedy controls were compared to herbicidal control using treatments of bromoxynil (3,5-dibromo-4-hydroxybenzonitrile). Reductions in yield of wheat as affected by competition from corn cockle were not significant if weeds were removed before February of each year in winter wheat that had been seeded the previous October. Bromoxynil controlled more weed plants when applied on corn cockle that had less than four leaves (fall treatment). Corn cockle densities of 170 to 340 plants/m2 at the Pendleton, Oregon site lowered wheat yields an average of 18% when competition was eliminated by March. Competition that continued until wheat harvest (July) reduced yields 60%.

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References

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1. Appleby, A. P. and Rydrych, D. J. 1976. Selective control of weeds in field crops. Pages 3538 in Hepworth, H., ed. Oregon Weed Control Handbook, Oregon State Univ. Ext. Serv., Corvallis.
2. Gilkey, H. M. 1957. Weeds of the Pacific Northwest. Oregon State College Press. Corvallis. 441 pp.
3. Hitchcock, C. L., Cronquist, A., Ownbey, M., and Thompson, J. W. 1964. Vascular plants of the Pacific Northwest. Univ. of Wash. Press. Seattle. 2:251252.
4. Rydrych, D. J. 1974. Competition between winter wheat and downy brome. Weed Sci. 22:211214.
5. Rydrych, D. J. and Burr, R. J. 1974. Herbicides for annual weed control in wheat in eastern Oregon. Oregon Agric. Ext. Serv. Circ. 811. 2 pp.
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7. Swan, D. G. 1971. Competition of blue mustard with winter wheat. Weed Sci. 19:340342.

Keywords

Corn Cockle (Agrostemma githago) Competition in Winter Wheat (Triticum aestivum)

  • D. J. Rydrych (a1)

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