Netherlands Journal of Plant Pathology

, Volume 90, Issue 4, pp 165–171 | Cite as

Persistence of resistance to fungicides in Sphaerotheca fuliginea

  • H. T. A. M. Schepers
Article

Abstract

Isolates ofSphaerotheca fuliginea collected in 1981–1983 in cucumber glasshouses in the Netherlands were tested for their sensitivity to benzimidazole fungicides, dimethirimol, dinocap and pyrazophos.

Resistance to dinocap was not observed, although this fungicide has been used for over 30 years. Resistance to benzimidazole fungicides and dimethirimol has been persistent since these fungicides were withdrawn for control of cucumber powdery mildew more than 10 years ago. Although pyrazophos has only been used incidentally after 1977, the level of resistance has not decreased.

Factors possibly involved in the persistence of resistance and implications for disease control in practice are discussed.

Samenvatting

De gevoeligheid voor twee benzimidazool-fungiciden en dimethirimol, dinocap en pyrazofos werd getoetst vanSphaerotheca fuliginea isolaten die in 1981–1983 verzameld waren in komkommerkassen in Nederland. Resistentie tegen dinocap werd niet waargenomen, ofschoon dit fungicide al meer dan 30 jaar wordt gebruikt.

De resistentie tegen benzimidazool-fungiciden en dimethirimol, die meer dan 10 jaar geleden werden teruggetrokken voor de bestrijding vanS. fuliginea, was persistent. Hoewel pyrazofos slechts incidenteel gebruikt is sinds 1977, is het resistentieniveau niet teruggelopen. Factoren die mogelijk betrokken zijn bij de persistentie van resistentie en de gevolgen voor de ziektebestrijding worden besproken.

Additional keywords

cucumber powdery mildew benomyl carbendazim dimethirimol dinocap pyrazophos 

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 1984

Authors and Affiliations

  • H. T. A. M. Schepers
    • 1
  1. 1.Laboratory of PhytopathologyAgricultural UniversityWageningenthe Netherlands

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