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Comparison of infection structures formed on susceptible Brassica carinata SMP3-82 by two isolates of Sclerotinia sclerotiorum with different levels of aggressiveness. (A) Isolate MBRS-1 (highly aggressive) infection cushions at 24 hpi (arrowhead), (B) isolate WW-3 (weakly aggressive) infection structure at 24 hpi (arrowhead), (C) isolate MBRS-1 dense infection cushion at 72 hpi (arrowhead), (D) isolate WW-3 diffuse infection cushion at 72 hpi (arrowhead). Scale bars (A–D) = 100 µm.
