Potato Research

, Volume 34, Issue 1, pp 71–78

Effect of a continuous hot water treatment of potato tubers on seed-borne fungal pathogens

  • E. P. Dashwood
  • E. M. Burnett
  • M. C. M. Perombelon
Article

DOI: 10.1007/BF02358097

Cite this article as:
Dashwood, E.P., Burnett, E.M. & Perombelon, M.C.M. Potato Res (1991) 34: 71. doi:10.1007/BF02358097

Summary

The viability of five pathogens was decreased by treatment with hot water when tested in vitro.Polyscytalum pustulans was most sensitive andRhizoctonia solani least sensitive.

Potato tubers were exposed to 55°C for 5 min in a commercial continuous hot water treatment plant using naturally contaminated seed tubers and tubers which had been inoculated by dipping in comminuted cultures. The frequency of eyes colonised byP. pustulans, Helminthosporium solani, andR. solani was reduced to virtually zero and the effect persisted on tubers subsequently stored at 4°C and at 15°C for up to 16 wk. Results withColletotrichum coccodes were inconclusive. Treatment suppressedPenicillium spp. which, however, rapidly recolonised the eyes during storage, leading to higher contamination levels in the treated than in the untreated tubers. With tubers inoculated withPhoma foveata, good control was achieved when the incubation period before treatment was 10 d but not when the period was 42 d.

Additional key words

Polyscytalum pustulansHelminthosporium solaniRhizoctonia solaniColletotrichum coccodesPhoma foveataantagonists

Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • E. P. Dashwood
    • 1
  • E. M. Burnett
    • 1
  • M. C. M. Perombelon
    • 1
  1. 1.Scottish Crop Research InstituteDundeeScotland