Evolution of fungicide resistance in the cereal eyespot fungi Tapesia yallundae and Tapesia acuformis in France

✍ Scribed by Leroux, Pierre; Gredt, Michel

• Book ID: 101214537
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 213 KB
• Volume: 51
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199711)51:3<321::aid-ps639>3.0.co;2-u

✦ Synopsis

Field isolates of the cereal eyespot pathogen can be divided into two groups which are now considered as two species : T apesia yallundae and T apesia acuformis. In both species the Ðrst case of acquired resistance was observed with benzimidazole fungicides in the early 1980s. At the same time, a number of sterol C-14 demethylation inhibitors (DMIs), such as the imidazole prochloraz and several triazoles, including Ñusilazole, were introduced. Surprisingly T . acuformis appeared intrinsically resistant to the triazole derivatives in comparison to T . yallundae, but both species were sensitive to prochloraz. The intensive use of these DMIs led to the development of acquired resistance towards triazoles in T . yallundae and towards prochloraz in T . acuformis. Today all the strains in both species appear equally sensitive to the anilinopyrimidine cyprodinil.