Ring spot disease of brassica crops : resistance and epidemiology

Research output: Thesisinternal PhD, WU

Abstract

<p>Ring spot disease of brassica crops is caused by the fungus <em>Mycosphaerella brassicicola</em> . The disease can cause severe qualitative and quantitative losses, depending on the initial inoculum, the environmental conditions during the growing season and the susceptibility of the cultivar.</p><p>A greenhouse screening method for resistance to ring spot in <em>Brassica oleracea</em> was developed. Young plants were screened by using mycelial inoculum enriched with 3% sucrose. Resistance was expressed both in cotyledons and true leaves by a lower number of lesions than the susceptible control and/or by hypersensitive reactions, and reflected adult plant resistance known from field studies.</p><p>Studies with isolates of <em>M. brassicicola</em> , originating from various locations in Europe, indicated a differential host-pathogen interaction. Several aspects of the epidemiology of the disease were studied.</p><p>Infection of cabbage plants under controlled conditions showed that ascospores of <em>M. brassicicola</em> are able to infect cabbage plants within shorter wetness periods (&lt; 1 day) than generally assumed. The pathogen is well adapted to exploit leaf wetness interrupted by dry periods, which makes the definition of an infection period for <em>M. brassicicola</em> in terms of continous leaf wetness or high humidity unwarranted.</p><p>From field studies it is concluded that the fungus has long incubation and latent periods, which should be taken into consideration when applying fungicides to control the disease.</p>
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • Zadoks, J.C., Promotor
  • Frinking, H.D., Promotor, External person
Award date11 Nov 1998
Place of PublicationS.l.
Publisher
Print ISBNs9789054859468
Publication statusPublished - 1998

Keywords

  • mycosphaerella brassicicola
  • plant pathogenic fungi
  • plant pathogens
  • plant diseases
  • brassicaceae
  • brassica
  • disease resistance
  • epidemiology

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