Investigations for destroying the seed-borne black leg fungus of sugarbeet, Phoma betae Frank (teleomorph Pleospora bjoerlingii Byford), by heat treatment.
The effectiveness of heat therapy for elimination of P. betae [Pleospora betae] is described. Sugarbeet seeds from the cv. Ponemo infected by P. betae were treated at a range of temp. between 30 and 90°C for between 10 and 60 min. A 30-min treatment at 70° reduced the incidence of the fungus, but also greatly decreased seed germination. A 10-min treatment at 75° controlled P. betae without loss of germination. It was concluded, however, that heat treatment used to control P. betae was not suitable for general application to sugarbeet seed.