Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 23:680-682 (1983)
© 1983 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Simultaneous Selection for Yield and Resistance to Brown Stem Rot of Soybean in Hill Plots1

D. S. Ertl and W. R. Fehr2

The yield of soybean [Glycine max (L.) Merr.] grown in row plots can be reduced by brown stem rot [caused by Phialophora gregata (Allington and Chamberlain) W. Gams]. Our objective was to evaluate the effectiveness of simultaneous selection among soybean lines for yield and resistance to brown stem rot in hill plots planted on soil infested with the causal organism. Ninety-six random F4-derived lines from an intermated population were grown in three replications of single, unbordered hill plots on four fields infested with P. gregata and on four uninfested fields. Selection for yield alone was not effective in identifying lines with a low percentage of stem browning. The correlation between yield and percentage of stem browning (r = –0.19) was not significant. Twenty-three of the 48 lines with the highest average yield had below-average resistance to brown stem rot. There was a high correlation for yield of the 96 lines on infested and uninfested soil (r = 0.80, P <0.01). When hill plots are used to determine the yield potential of soybean lines, resistance to brown stem rot should be evaluated independently by growing the lines on infested soil and splitting stems to determine the extent of infection. Evaluation of yield potential in hill plots can be done equally well on infested and uninfested soil.

Key Words: Glycine max (L.) Merr. • Phialophora gregata (Allington and Chamberlain) W. Gams • Seed yield

1 Journal Paper no. J-10782 of the Iowa Agric. Home Econ. Exp. Stn., Project 2475, Ames, Iowa. The research was supported in part by a grant from the Iowa Soybean Promotion Board.

2 Graduate research assistant and professor, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.

Received for publication September 15, 1982.




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Environmental Quality		 The Plant Genome
Copyright © 1983 by the Crop Science Society of America.