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Netherlands Journal of Plant Pathology

, Volume 90, Issue 3, pp 95–106 | Cite as

Resistance in Rhizoctonia solani to tolclofos-methyl

  • Ariena H. C. Van Bruggen
  • P. A. Arneson
Article

Abstract

Isolates ofRhizoctonia solani were adapted in vitro to grow on a medium amended with tolclofos-methyl at a concentration 500 times that which initially almost completely inhibited growth.

Acquired resistance was retained after five transfers on a fungicide-free medium. Pathogenicity of resistant isolates was not reduced, but their growth rates on PDA were significantly lower than those of the original isolates. Recovery of the resistant isolates was not improved on a selective medium amended with tolclofos-methyl.

Samenvatting

Na overenting op een medium dat tolchlofos-methyl bevatte, raakten enkele isolaten vanRhizoctonia solani gewend aan 500 maal de dosis die oorspronkelijk bijna alle groei verhinderde.

Resistente isolaten vanR. solani bleven minder gevoelig voor tolchlofos-methyl na vijf overentingen op een medium zonder het fungicide. De pathogeniteit van resistente isolaten was niet verminderd, maar hun groeisnelheid op PDA was significant vertraagd vergeleken bij die van de oorspronkelijke isolaten. Isolatie van de resistente stammen werd niet verbeterd op een selectief medium waaraan tolchlofos-methyl was toegevoegd.

Additional keywords

fungicide resistance Rizolex stable resistance fitness pathogenicity 

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Copyright information

© Nederlandse Planteziektenkundige Vereniging 1984

Authors and Affiliations

  • Ariena H. C. Van Bruggen
    • 1
  • P. A. Arneson
    • 1
  1. 1.Department of Plant PathologyCornell UniversityIthacaUSA

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