Frequency of susceptibility to northern stem canker in soybean varieties from maturity groups 0 through II

A total of 377 soybean entries submitted to the South Dakota State University crop performance testing program were assessed for susceptibility to northern stem canker, caused by Diaporthe phaseolorum var. caulivora (DPC). Entries included conventional (CI, CII) and glyphosate-resistant (RR 0, RR I,...

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Bibliographic Details
Published in:Phytopathology 2005-06, Vol.95 (6)
Main Authors: Chase, TE, Geppert, R
Format: Article
Language:English
Subjects:
Diaporthe phaseolorum
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Summary:A total of 377 soybean entries submitted to the South Dakota State University crop performance testing program were assessed for susceptibility to northern stem canker, caused by Diaporthe phaseolorum var. caulivora (DPC). Entries included conventional (CI, CII) and glyphosate-resistant (RR 0, RR I, RR II) varieties and lines from 32 private companies as well as the SDSU public breeding program. The study was conducted as a field trial in 2003. Ten plants at the flowering stage were inoculated per plot with DPC infested toothpicks. Plots were rated 5-6 weeks later. Varieties with 0% killed were classified as resistant (R); 10-30% killed were classified as moderately resistant (MR); 40-100% killed were classified as susceptible (S). The percentage of classes (R/MR/S) within each group was as follows: C I, 23/31/46; CII, 15/49/36; RR 0, 11/29/59; RR I, 8/26/65; RR II, 11/58/31. A group of 45 varieties was selected for a follow-up greenhouse study. Greenhouse inoculations gave higher levels of infection overall but did not correlate well with the results from the field study.
ISSN:0031-949X