Resistance Risk and Current Status

Dicarboximides were originally introduced for control of Botrytis cinerea, primarily on vines where they were welcomed due to the occurrence at the time of resistance to MBC fungicides. Resistance management strategies were poorly understood at the time and this inevitably led to overuse of the products such that resistance developed very quickly. Botrytis remains the main fungus at risk although resistance in other genera can easily be found (Table 1).

Table 1. Fungi resistant to dicarboximides (based on Pommer & Lorenz 1987)

Fungus Year first noted
Alternaria alternata 1980
Alternaria alternata pv. citri 1996
Alternaria brassicicola 2005
Alternaria kikuchiana 1979
Aspergillus nidulans 1977
Botryosphaeria dothidea 2001
Botrytis cinerea 1977
Botrytis elliptica 1992
Botrytis squamosa 1980
Botrytis tulipae 1979
Cochliobolus heterostrophus (mutation) 2003
Cochliobolus miyabeanus 1979
Magnaporthe grisea - (2005)
Microdochium nivale 1990
Monilinia fructicola 1978
Monilinia laxa 1982
Neurospora crassa 1984
Penicillium expansum 1978
Rhizoctonia solani 1979
Rhizopus nigricans 1979
Sclerotinia homoeocarpa 2003
Sclerotinia minor 1983
Sclerotinia sclerotiorum 1979
Sclerotium cepivorum 1984
Ustilago maydis 1978

References


Pommer, E-H., Lorenz, G. (1987) Dicarboximide fungicides. In: Modern Selective Fungicides. Ed H Lyr, Gustav Fischer 1987, pp99 – 118. 

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