Netherlands Journal of Plant Pathology

, Volume 88, Issue 6, pp 231–236 | Cite as

Toxicity of fenpropimorph to fenarimol-resistant isolates of Penicillium italicum

  • M. A. De Waard
  • J. G. M. Van Nistelrooy
Article

Abstract

Fenarimol-resistant isolates ofPenicillium italicum with cross-resistance to imidazole and triazole fungicides which inhibit ergosterol biosynthesis were tested for their sensitivity to fenpropimorph. Radial growth tests on PDA showed that the isolates (n=6) lacked cross-resistance to fenpropimorph or displayed enhanced sensitivity to the fungicide (negatively correlated cross-resistance). Control of blue mold decay of oranges incited by the wild-type isolate could be achieved by dipping fruits in suspensions of fenpropimorph at a concentration of 100 mg ml−1. Decay of oranges incited by the fenarimol-resistant isolates was controlled at the same or at a lower concentration (30 mg ml−1), thus showing that the normal or increased sensitivity to fenpropimorph is also expressed under in vivo conditions.

Samenvatting

Fenarimol-resistente isolaten vanPenicillium italicum met kruisresistentie tegen imidazool-en triazoolfungiciden die de ergosterolbiosynthese remmen, werden getoetst op hun gevoeligheid voor fenpropimorf. Radiale groeiproeven op PDA toonden aan dat de isolaten (n=6) geen kruisresistentie bezaten met fenpropimorf of een verhoogde gevoeligheid voor het middel vertoonden (negatief gecorreleerde kruisresistentie). Op sinaasappels konPenicillium-rot, veroorzaakt door het wild-type bestreden worden door middel van een dompelbehandeling met fenpropimorf bij een dosering van 100 μg ml−1). Bestrijding van rot veroorzaakt door fenarimil-resistente isolaten werd verkregen bij dezelfde of een lagere dosering (30 μg ml−1); aldus werd aangetoond dat de normale of verhoogde gevoeligheid voor fenpropimorf ook in vivo tot uiting komt.

Additional keywords

fungicide resistance negatively correlated cross-resistance Corbel ergosterol-biosynthesis inhibitors 

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 1982

Authors and Affiliations

  • M. A. De Waard
    • 1
  • J. G. M. Van Nistelrooy
    • 1
  1. 1.Laboratory of PhytopathologyAgricultural UniversityWageningenThe Netherlands

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