Sensitivity of <i>Neonectria ditissima</i> to carbendazim fungicide in New Zealand


  • M. Walter
  • O.D. Stevenson
  • N.T. Amponsah
  • R.W.A. Scheper
  • A.R.G. McLachlan



Carbendazim can be used by New Zealand pipfruit growers for control of European canker caused by Neonectria ditissima A total of 162 N ditissima isolates were tested for carbendazim sensitivity using a mycelial growth assay on amended malt extract agar plates at concentrations from 02 mg/litre Generally isolates ceased growth at 2 mg/ litre carbendazim with 65 isolates ceasing growth at 1 mg/litre The EC50 values calculated for 19 isolates ranged from 051 to 138 mg/litre The data suggested that isolates ranged from sensitive (EC50<1 mg/litre) to having intermediate resistance (EC50110 mg/litre carbendazim) based on comparison with other agarbased studies Resistance in other fungi has been reported at carbendazim concentrations of >100 mg/litre The isolates tested were mostly sensitive to carbendazim but some showed a shift towards intermediate resistance Mycelial growth tests at 2 mg/litre may be a useful tool to screen single spore isolates quickly for potential carbendazim resistance




How to Cite

Walter, M., Stevenson, O., Amponsah, N., Scheper, R. and McLachlan, A. 2014. Sensitivity of &lt;i&gt;Neonectria ditissima&lt;/i&gt; to carbendazim fungicide in New Zealand. New Zealand Plant Protection. 67, (Jan. 2014), 133–138. DOI:




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