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The susceptibility of apple and pear rootstocks to European canker (Neonectria ditissima), and the effect of rootstocks on scion susceptibility are largely unknown. Bioassays were conducted to determine the susceptibility to European canker of selected apple and pear rootstocks, and ‘Royal Gala’ scions bench-grafted onto four apple rootstocks. Trials were conducted using potted trees in a glasshouse in Havelock North and eld-planted trees in Motueka. Significant differences in susceptibility were observed among rootstocks, but the ‘Royal Gala’ scions were significantly more susceptible than the rootstocks. Accessions were exposed to a harsher test in the glasshouse, so fewer rootstocks were classified as “resistant”. Nevertheless, rootstocks ‘M116’, ‘MM106’ and ‘Quince C’ showed high rates of resistance in both locations. Rootstock effects on the susceptibility of ‘Royal Gala’ were observed in the field but not in potted trees. In further testing using ‘Royal Gala’ and ‘Golden Delicious’ grafted onto four rootstocks, the rootstock choice affected ‘Royal Gala’ susceptibility but not ‘Golden Delicious’.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Resistance of apple and pear rootstocks to Neonectria ditissima and their effect on scion susceptibility