Location of Repository

Fungicide resistance among Cladobotryum spp. – causal agents of cobweb disease of the edible mushroom Agaricus bisporus

By Helen M. Grogan and R. H. Gaze


A survey of fungicide resistance among isolates of the mushroom pathogens Cladobotryum mycophilum and C. dendroides Types I and II was undertaken, with respect to the active ingredients thiabendazole, carbendazim (benzimidazoles) and prochloraz manganese following an epidemic in Britain and Ireland in 1994/95. The majority of isolates (41/57) were strongly resistant to thiabendazole (ED50 > 200 ppm) and were exclusively C. dendroides Type II. All C. mycophilum and C. dendroides Type I isolates, and four C. dendroides Type II isolates, were weakly resistant to thiabendazole (ED50 1–10 ppm). Thiabendazole-resistant C. dendroides Type II isolates were only weakly resistant to carbendazim (ED50 2–10 ppm) and isolates which were weakly resistant to thiabendazole were carbendazim-sensitive (ED50 < 1 ppm), demonstrating a lack of complete cross resistance between these two benzimidazole fungicides. The ED50 values for all isolates with respect to prochloraz manganese ranged from 0.14 to 7.8 ppm. Benzimidazole resistance was considered to have been an important factor influencing the severity of the 1994/95 cobweb epidemic but 25% of isolates collected were benzimidazole sensitive

Topics: SB
Publisher: Cambridge University Press
Year: 2000
OAI identifier: oai:wrap.warwick.ac.uk:831

Suggested articles



  1. (1994). Agaricicolous species of Hypomyces. doi
  2. (1986). Benzimidazole fungicides: mechanism of action and biological impact. doi
  3. (1992). Cladobotryum verticillatum ± a new pathogen of Agaricus bitorquis (Que!l.) Sacc.
  4. (1971). Conidium ontogeny in hyphomycetes. Development and morphology of Cladobotryum. doi
  5. (1983). Differential sensitivity to benzimidazole fungicides in strains of Hypomyces rosellus.
  6. (1971). Ecological control of pathogens and weed moulds in mushroom culture. doi
  7. (1997). Fungicide resistance and population variation in Verticillium fungicola, a pathogen of the button mushroom, Agaricus bisporus. doi
  8. (1999). Genetic andmorphologicalcharacterizationofCladobotryumspeciescausingcobweb diseaseofmushrooms.AppliedandEnvironmentalMicrobiology65,606±610.
  9. (1998). Identi®cation of benzimidazole resistance in Cladobotryum dendroides using a PCR-based method. doi
  10. (1990). Mechanism of action of N-phenylcarbamates in benzimidazole-resistant Neurospora strains. doi
  11. (1978). Notes on some fungicolus hyphomycetes and their relatives.
  12. (1993). Polyporicolous species of Hypomyces. doi
  13. (1990). The Biochemistry and Uses of Pesticides. 2nd edn. VCH doi
  14. (1983). The control of bubble diseases and cobweb disease of mushrooms with prochloraz. Plant Pathology 32, 123±131.Fungicide resistance among Cladobotryum spp. doi
  15. (1997). The problem page: Dactylium ± prudence or heroics.
  16. (1995). The problem page: Dactylium or Cobweb.

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.