Fungicides at risk from fungal resistance

Fungicide group Fungicides Resistance type
anilinopyrimidine cyprodonil

pyrimethanil

 reduced sensitivity
benzimidazole thiophanate-methyl resistant/sensitive
DMI (triazole) e.g. myclobutanil

penconazole

 reduced sensitivity
guanidine dodine resistant/sensitive
dicarboximide iprodione resistant/sensitive
strobilurines (QoI) kresoxim-methyl
pyraclostrobin		 resistant/sensitive
phenylamide metalaxyl-M resistant/sensitive
hydroxypyrimidine bupirimate reduced sensitivity
  • Where fungi develop reduced sensitivity to fungicides they may still be partially effective.
  • Where fungi such as Botrytis become resistant to a fungicide such as thiophanate-methyl the fungus isolate is totally resistant and the fungicide completely ineffective.