Journal of Plant Diseases and Protection (2010) 117, 185-191

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R.W.S. Weber and G. Palm (2010)
Resistance of storage rot fungi Neofabraea perennans , N. alba, Glomerella acutata and Neonectria galligena against thiophanate-methyl in Northern German apple production
Journal of Plant Diseases and Protection 117 (4), 185-191
Abstract: Fungi causing apple storage rots in the Lower Elbe region were examined for resistance against the methyl benzimidazole carbamate (MBC) fungicide thiophanate-methyl. In Neofabraea perennans , the most important post-harvest pathogen, strains with sensitivity (EC50 = 0.07 ppm), intermediate resistance (EC50 = 1.0-3.4 ppm) or high resistance (EC50 > 400 ppm) were found. A similar pattern was observed for N. alba in the Lower Elbe region, and for additional isolates of both species collected from the East German state of Brandenburg. In contrast, Neonectria galligena showed a uniform response of intermediate resistance to thiophanate-methyl (EC50 = 1.0-1.7 ppm). Glomerella acutata isolates were partially inhibited by low fungicide concentrations (EC50 = 0.2-0.6 ppm) but showed residual (20-40%) mycelial growth even at 400 ppm. Since Neofabraea strains with intermediate and high resistance were distributed throughoutthe Lower Elbe region, pre-harvest applications of thiophanate-methyl against storage rots cannot be recommended at present for this important centre of German apple production.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Roland W.S. Weber

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Neonectria ditissima Apple (Malus) Germany
Neonectria ditissima Stored fruits/vegetables Germany
Colletotrichum acutatum Apple (Malus) Germany
Colletotrichum acutatum Stored fruits/vegetables Germany
Phlyctema vagabunda Apple (Malus) Germany
Phlyctema vagabunda Stored fruits/vegetables Germany
Neofabraea perennans Apple (Malus) Germany
Neofabraea perennans Stored fruits/vegetables Germany