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  1. Vol. 10 No. 4, p. 400-402
     
    Received: Jan 27, 1970
    Published: July, 1970


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doi:10.2135/cropsci1970.0011183X001000040026x

Visual Selection for Yielding Ability of F3 Lines in a Hard Red Spring Wheat Breeding Program1

  1. K. G. Briggs and
  2. L. H. Shebeski2

Abstract

Abstract

The ability of fourteen plant breeders to visually select the highest yielding plots from a spring wheat (Triticum aestivum L. era. Thell.) nursery containing 828 F3 lines was compared with results obtained by random selection. When a positive selection pressure of 10% was applied a significant improvement in yield over random selection was obtained. Conditions for effective visual selection were optimal in this study with the use of triple row, rod length plots with controls adjacent to each one. Despite these aids, and despite the general effectiveness of visual selection to improve yields, individual selectors demonstrated a rather limited ability to identify the actual highest yielding plots in the nursery. These results support the view that when visual selection is used as a means of screening lines in a plant breeding program the intensity of selection should be relatively low.

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