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Temperature as a determining factor in the storage rot of sugarbeet caused by Aspergillus fumigatus.

Halloin, J. M.; Roberts, D. L.;

Journal of Sugar Beet Research Year: 1995 Vol: 32 Issue: 1 Pages: 59-67 Ref: 11 ref.

1995

บทคัดย่อ

Temperature as a determining factor in the storage rot of sugarbeet caused by Aspergillus fumigatus.

 

Aspergillus fumigatus was a pathogen in sugarbeet roots held at more than or equal to 35 deg C. The fungus occurred as a surface contaminant on freshly harvested roots; its incidence increased during storage of roots at 6 deg , apparently infecting wounds, but caused no rot at this lower temperature. At 35 deg , tolerance to A. fumigatus was greater for a cultivar resistant to crown and root rot caused by Rhizoctonia solani (AG-2-2) than for a cultivar susceptible to R. solani, but this tolerance diminished with increase in temperature to 40 deg . Roots killed by freezing were rotted rapidly at 22 deg , suggesting that tolerance to the rot is probably due to inducible rather than to constitutive inhibition of the fungus. Development of rot coincided with maximum growth of the fungus at approx equal to 40 deg . Rot caused by A. fumigatus is opportunistic and produces no mycotoxin; it is likely to be a problem only in stored roots that have undergone composting or metabolic heating. Subsequent coo

ling of such roots is unlikely to control further rot development.