The effect of wood age on infection by Neonectria ditissima through artificial wounds on different apple cultivars

The age of apple wood may affect its susceptibility to European canker (Neonectria ditissima). Therefore, a glasshouse experiment was conducted with potted trees of six apple cultivars (‘Braeburn’, ‘Scilate’, ‘Fuji’, ‘Golden Delicious’, ‘Jonathan’ and ‘Royal Gala’) grafted onto two rootstocks (‘M793’ and ‘M9’) to study the effect of 3-, 2- or 1-year-old wood on incidence and disease progression following inoculation with conidia of N. ditissima. Initial analyses of cultivars on ‘M793’ showed a significant wood age effect on disease incidence and lesion length, which was similar to cultivars grafted on ‘M9’. Three-year-old wood developed more and longer lesions than either the 2- or the 1-year-old wood. A significant cultivar effect was observed with ‘Royal Gala’ developing more lesions than the other cultivars tested. More than half of asymptomatic wounds placed onto apple sap-amended water agar for pathogen isolation yielded N. ditissima.

[1]  V. Bus,et al.  Progress in pipfruit resistance breeding and research at Plant & Food Research , 2017 .

[2]  M. Walter,et al.  Resistance of apple and pear rootstocks to Neonectria ditissima and their effect on scion susceptibility , 2017 .

[3]  B. Thomma,et al.  Development of a method for detection of latent European fruit tree canker (Neonectria ditissima) infections in apple and pear nurseries , 2017, European Journal of Plant Pathology.

[4]  J. K. Bowen,et al.  Variation in Host and Pathogen in the Neonectria/Malus Interaction; toward an Understanding of the Genetic Basis of Resistance to European Canker , 2016, Front. Plant Sci..

[5]  M. Walter,et al.  How many conidia are required for wound infection of apple plants by Neonectria ditissima , 2016 .

[6]  E. Liljeroth,et al.  Cut-off shoots method for estimation of partial resistance in apple cultivars to fruit tree canker caused by Neonectria ditissima , 2015 .

[7]  S. Zydenbos,et al.  Seasonal wound presence and susceptibility to Neonectria ditissima infection in New Zealand apple trees. , 2015 .

[8]  D. Hedderley,et al.  Effect of freezing of Neonectria ditissima inoculum on its pathogenicity. , 2015 .

[9]  D. Bates,et al.  Fitting Linear Mixed-Effects Models Using lme4 , 2014, 1406.5823.

[10]  M. Walter,et al.  Agar media for isolation of Neonectria ditissima from symptomatic and asymptomatic apple tissues and production of infective conidia , 2014 .

[11]  R. Beresford,et al.  Identification of regional climatic conditions favorable for development of European canker of apple. , 2011, Phytopathology.

[12]  L. Cooke.  The Influence of Fungicide Sprays on Infection Of Apple cv. Bramley's Seedling By Nectria galligena , 1999, European Journal of Plant Pathology.

[13]  M. Ridout,et al.  The effects of inoculum dose, duration of wet period, temperature and wound age on infection by Nectria galligena of pruning wounds on apple , 1998, European Journal of Plant Pathology.

[14]  W. Weg.  Note on an inoculation method to infect young apple seedlings with Nectria galligena Bres. , 2004, Euphytica.

[15]  K. Phelps,et al.  Relative significance of nursery infections and orchard inoculum in the development and spread of apple canker (Nectria galligena) in young orchards , 2003 .

[16]  C. Glerum.  FOOD SINKS AND FOOD RESERVES OF TREES IN TEMPERATE CLIMATES , 1980 .

[17]  T. Swinburne.  European canker of apple (Nectria galligena) , 1975 .

[18]  H. Dubin,et al.  Factors affecting apple leaf scar infection by Nectria galligena conidia. , 1974 .

[19]  F. Alston.  Response of apple cultivars to canker, Nectria galligena. , 1970 .