Verticillium wilt in trees. Detection, prediction and disease management

Research output: Thesisinternal PhD, WU

Abstract

Verticillium dahliae , the causal agent of verticillium wilt, is the cause of high losses in a number of crops, especially nursery trees. Existing methods for quantification of V. dahliae microsclerotia in the soil were compared. The distinction of V. dahliae and V. tricorpus was studied on two semi-selective media. The morphology was highly dependent on the medium. Discriminating morphological characteristics were successfully used to identify isolates. There were no virulence differences on trees between the two V. dahliae VCGs that occur in the Netherlands. Biological soil disinfestation reduced V. dahliae in the soil by 85% and Pratylenchus fallax nematodes by 99%, through the creation of anaerobic conditions. The relationships between soil inoculum densities and verticillium wilt in Acer platanoides and Catalpa bignonioides showed that up to 5% diseased plants occurred at 1-2 detected microsclerotia per g soil. Diseased plants often recovered, but had a higher chance of becoming diseased again.

Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • Wageningen University
Supervisors/Advisors
  • van Bruggen, Ariena, Promotor
  • Termorshuizen, Aad, Co-promotor
Award date19 Sep 2003
Place of Publication[S.I.]
Print ISBNs9789058088727
Publication statusPublished - 2003

Keywords

  • verticillium dahliae
  • wilts
  • ornamental woody plants
  • plant pathogenic fungi
  • virulence
  • soil biology
  • epidemiology
  • pathogenicity
  • netherlands

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