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Reference Report for IND79017073
Title:Brown spot development and yield response of soybean inoculated with Septoria glycines at various growth stages
Authors:Young, L.D., Ross, J.P.
Source:Phytopath. 1979, 69(1):8-11
Abstract:S. glycines caused 17.1% loss in yield on the soybean cv. Essex in field tests during 1976; yield and seed size were negatively correlated with percent leaf area diseased. Yield loss was due to reduction in seed size. Symptoms appeared 2 weeks later in 1977 than in 1976; disease levels were lower and loss was nil. The periods for max. symptoms development for Essex plants inoculated with S. glycines at the 2nd trifoliolate stage, at flowering and at full-pod stage were approx. 21, 40 and 21 days, respectively. The longer incubation period of infections initiated near flowering accounted for the marked reduction in the disease during midsummer.ADDITIONAL ABSTRACT:In field experiments in 1977, no significant reduction in yield due to S. glycines was found in the varieties Centennial, Forrest or Essex. However, inoculation was followed by a significant increase in percentage defoliation and diseased leaf area in Essex and, to a lesser extent, in Centennial. Disease severity was least on the latter variety.






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