University of Hertfordshire

Factors affecting the pathogenicity of Verticillium dahliae to spring linseed

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Original languageEnglish
Title of host publicationIOBC-WPRS Bulletin
Subtitle of host publicationIntegrated Control in Oilseed Crops
Place of PublicationUK
ISBN (Print)92-9067-139-0
Publication statusPublished - 2002
EventIOBC-WPRS Working Group: Integrated Control in Oilseed Crops - Soest, Germany
Duration: 23 Apr 200124 Apr 2001


ConferenceIOBC-WPRS Working Group


Experiments were done to examine the pathogenicity of V. dahliae isolates from
linseed and other hosts to linseed cultivars. No evidence of host adaptation was found as linseed isolates were not more pathogenic to linseed than isolates from other hosts. The molecular variation of V. dahliae isolates from different hosts was tested using RFLP analysis of ribosomal DNA; the isolates could be divided into two groups by this method; isolates from linseed were all in the same
group. The effects of air temperature and soil temperature on the progress of the disease caused by V. dahliae were tested in controlled environment conditions. An increase in soil temperature from 16oC to 24oC increased the severity of the disease symptoms but the effect of the soil temperature
also seemed to be influenced by the pathogenicity of the V. dahliae isolate. An increase in air temperature from 16oC to 24oC increased the severity of the disease symptoms for all isolates of V. dahliae used. Disease progress in a spring linseed crop was not related to the initial inoculum density or to the previous cropping sequence. At the end of flowering the plants appeared
symptomless even though the fungus had already spread within them, whereas symptoms had developed by the time capsules were senescing.

ID: 2030933