Brown Spot Development and Yield Response of Soybean Inoculated with Septoria glycines at Various Growth Stages

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Abstract
Brown spot (which is incited by S. glycines) caused 17.1% yield loss on ''Essex'' soybeans [Glycine max] in field tests in 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 wk later in 1977 than in 1976; disease levels were lower and loss was nil. The periods for maximum symptom development of ''Essex'' plants inoculated with S. glycines at the 2nd trifoliolate stage, at flowering and at full-pod stage were approximately 21, 40 and 21 days, respectively. The longer incubation period of infections initiated near flowering accounted for the marked reduction in brown spot of soybean during midsummer.

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