Effect of rust phakopsora pachyrhizi on soybean yield and quality in southeastern queensland australia
Ogle, H.J.; Byth, D.E.; Mclean, R.
Australian Journal of Agricultural Research 30(5): 883-894
ISSN/ISBN: 0004-9409 Accession: 005267511
Plots of soybeans [Glycine max] were protected from rust, P. pachyrhizi, with mancozeb sprays for varying periods after sowing. Seed yield losses were 60-70% in the most severely rusted plots. In a glasshouse trial, rust inoculations were commenced at regular intervals during growth, and yield was reduced by 95% in plants inoculated immediately prior to flowering. In both trials, reduced yield was associated with reductions in the number of filled pods per plant, the number of filled seeds per plant and seed weight. The oil but not the protein content of the seed was also reduced in the more severely rusted treatments in the field trial.