บทคัดย่องานวิจัย

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Effect of low temperature on growth and pathogenicity of Phoma betae on sugarbeet steckling in storage.

Bertolini, P.; Tian ShiPing;

Petria Year: 1996 Vol: 6 Issue: 3 Pages: 215-223 Ref: 10 ref.

1996

บทคัดย่อ

Effect of low temperature on growth and pathogenicity of Phoma betae on sugarbeet steckling in storage.

The effects of temp. on mycelial growth and spore germination of P. betae [Pleospora betae] were determined at 20, 10, 4, 2, 0, -2 and -4 deg C in culture. Pathogenicity on steckling roots of sugarbeet was investigated at 20, 10, 4, 2, 0 and -1.5 deg in storage. Colony enlargement was significantly limited and spore germination was delayed by decreasing temp. from 20 to -4 deg . P. betae was able to grow and germinate on PDA at temp. as low as -4 deg . Disease incidence and lesion development caused by P. betae on sugarbeet steckling roots were also inhibited by decreasing temp. from 20 to -1.5 deg . The infection of P. betae on wound-inoculated roots occurred earlier with a higher disease incidence compared with unwound-inoculated ones. Infection by contact with decayed roots was quite high, although it was reduced by lower temp. during storage.