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Volunteer Potato Density Influences Critical Time of Weed Removal in Bulb Onion

  • Martin M. Williams (a1), Corey V. Ransom (a2) and W. Mack Thompson (a3)

Volunteer potato is highly competitive with onion and few control tactics are effective for removing this weed from an onion crop. Both volunteer potato density and duration of interference reduce onion yield, but the interaction of these factors is unknown. Field trials were conducted in 2003 in Idaho, Oregon, and Washington to determine the influence of volunteer potato density on the critical time of weed removal (CTWR) in onion. Yield losses of 2.5, 5.0, and 10% were estimated to occur at 534, 654, and 830 growing degree days (GDD) after onion emergence, respectively, with a volunteer potato density of 0.5 plants/m2. At 2.0 volunteer potato plants/m2, yield losses of 2.5, 5.0, and 10% were estimated to occur at 388, 481, and 598 GDD after onion emergence, respectively. Volunteer potato at 2.0 plants/m2 had to be removed at least one onion leaf stage sooner, compared to a weed density of 0.5 plants/m2, to avoid yield loss. Yield loss due to volunteer potato density or duration of interference was greatest among jumbo, colossal, and supercolossal market grades (P ≤ 0.1). Lowering potato tuber density in crops preceding onion will extend the critical time for weed removal and reduce the risk of crop loss.

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J. K. A. Bleasdale 1959. The yield of onions and red beet as affected by weeds. J. Hortic. Sci. 34:713.

R. A. Boydston and M. D. Seymour 2002. Volunteer potato (Solanum tuberosum) control with herbicides and cultivation in onion (Allium cepa). Weed Technol. 16:620626.

C. M. Dunan , P. Westra , F. Moore , and P. Chapman 1996. Modelling the effect of duration of weed competition, weed density and weed competitiveness on seeded, irrigated onion. Weed Res. 36:259269.

P. J. Ellis 1992. Weed hosts of beet western yellow virus and potato leafroll virus. Plant Dis. 76:11371139.

R. T. Hewson and H. A. Roberts 1971. The effect of weed removal at different times on the yield of bulb onions. J. Hortic. Sci. 46:471483.

R. T. Hewson and H. A. Roberts 1973. Some effects of weed competition on the growth of onions. J. Hortic. Sci. 48:5157.

S. Z. Knezevic , S. P. Evans , E. E. Blankenship , R. C. Van Acker , and J. L. Lindquist 2002. Critical period for weed control: the concept and data analysis. Weed Sci. 50:773786.

P. J. W. Lutman 1977. Investigations into some aspects of the biology of potatoes as weeds. Weed Res. 17:123132.

M. C. M. Perombelon 1975. Observations on the survival of potato ground-keepers in Scotland. Potato Res. 18:205215.

C. A. Shadbolt and L. G. Holm 1956. Some quantitative aspects of weed competition in vegetable crops. Weeds 4:111123.

P. E. Thomas 1983. Sources and dissemination of potato viruses in the Columbia basin of Northwestern United States. Plant Dis. 67:744747.

H. D. J. Van Heemst 1985. The influence of weed competition on crop yield. Agric. Syst. 18:8193.

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Weed Technology
  • ISSN: 0890-037X
  • EISSN: 1550-2740
  • URL: /core/journals/weed-technology
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