ISHS Acta Horticulturae 698: VI International Symposium on Chemical and non-Chemical Soil and Substrate Disinfestation - SD2004
THERMAL INACTIVATION OF FUSARIUM OXYSPORUM F. SP. DIANTHI AND ITS ERADICATION BY SOIL SOLARIZATION AT DIFFERENT DEPTHS |
| Authors: | E. Suárez-Bonnet, C.J. López-Herrera, J.M. Melero-Vara , A.M. Prados-Ligero |
| Keywords: | carnation, Fusarium wilt, inoculum viability, soil-borne fungi |
| Abstract:
The increase of daily maximum hourly temperatures at 15 and 30 cm depth in soil solarized in July-August 2002 inside a closed plastic-house was 4-6°C, and determined associated reductions in the viability of three isolates of Fusarium oxysporum f. sp. dianthi (Fod). Burial of the infested soil at 15, 30 and 45 cm depth in untreated plots also reduced viability of the fungus, the effect declining with depth. Soil solarization in the same period in 2003 showed similar temperatures but reductions in pathogen viability were less pronounced. The combination of soil solarization during a sub-optimal period (September 2003) with buried water pipe heating brought about higher daily maximum hourly temperatures but reduction in viability was less for one of the isolates of Fusarium oxysporum f. sp. dianthi, apparently more heat tolerant than the others. Pathogenicity tests conducted with a collection of Fod isolates recovered at different times and depths from treatments performed in 2002 and 2003 indicated the lack of an effect on pathogen virulence. | |
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