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Sunflower White Mold caused by  Sclerotinia sclerotiorum and Sclerotinia minor  is a devastating disease worldwide. To investigate the effect of low temperature (4 °C) on biological characteristics and aggressiveness of isolates of the two species, which were collected from the same field in Baiyinchagan, Inner Mongolia, their mycelial growth rate, oxalic acid secretion level and polygalacturonase activity were compared under normal culture temperature (23 °C) and low temperature (4 °C). Aggressiveness was also evaluated on detached leaves by inoculating the isolates produced in both temperatures. The results suggested that culture of isolates at 4 °C not only promoted mycelial growth, but also enhanced secretion of oxalic acid and polygalacturonase activity of both  S. sclerotiorum  and  S. minor  isolates compared to that cultured at 23 °C. Additionally, the corresponding aggressiveness of tested isolates of the two species also increased after culture at 4 °C. However,  S. sclerotiorum  always showed faster mycelial growth, higher oxalic acid levels and greater polygalacturonase activity than  S. minor  at both 23 °C and 4 °C, indicating that  S. sclerotiorum  is generally the more aggressive species than  S. minor .

Effect of low temperature culture on the biological characteristics and aggressiveness of Sclerotinia sclerotiorum and Sclerotinia minor