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Assessment of brown spot septoria glycines alone and in combination with bacterial blight pseudomonas syringae pathovar glycinea on soybeans in a short season area



Assessment of brown spot septoria glycines alone and in combination with bacterial blight pseudomonas syringae pathovar glycinea on soybeans in a short season area



Canadian Journal of Plant Pathology 10(1): 78-82



Brown spot (Septoria glycines) alone and in combination with bacterial blight (Pseudomonas syringae pv. glycinea) was assessed in terms of percent leaf-area infected (PCAR), percent leaves infected (PCIF), percent defoliation (PCDF), and seed yield of several soybean (Glycine max) cultivars during 1980-85 at the Central Experimental Farm, Ottawa. The amount of leaf-area infected was greater for S. glycines than for P. s. pv. glycinea. Evidence that the two pathogens together were additive in the amount of foliage infection produced was obtained only when disease levels were relatively low; otherwise the combined effect was not significantly greater than that of the brown spot pathogen alone. Brown spot caused yield losses up t 13% in some years indicating its economic importance. Among the variables PCAR, PCIF, PCDF and yield, only log (PCAR + 0.01) and PCIF were consistently correlated over 5 years suggesting that PCIF can be used for a rapid foliage infection assessement.

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Accession: 004786788

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