New Zealand Plant Protection 67 (2014): 133-138
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 0-2 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 0.51 to 1.38 mg/litre. The data suggested that isolates ranged from sensitive (EC50<1 mg/litre) to having intermediate resistance (EC50=1-10 mg/litre carbendazim), based on comparison with other agar-based 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.
Keywords: European canker, Neonectria galligena, Nectria galligena, benzimidazole.
|Are shelter belts potential inoculum sources for Neonectria ditissima apple tree infections?|
M.Walter, M.K. Glaister, N.R. Clarke, H. von Lutz, Z. Eld, N.T. Amponsah and N.F. Shaw (2015)
New Zealand Plant Protection 68: 227-240
|Resistance of Venturia inaequalis to demethylation inhibitor and dodine fungicides in four New Zealand apple-growing regions|
R.M. Beresford, P.J. Wright, P.N. Wood, N.M. Park, N.J. Larsen and B.M. Fisher (2013)
New Zealand Plant Protection 66: 274-283
Copyright © 2014 New Zealand Plant Protection Society (Inc.).