NZPPS   ·  Journal home   ·   Past issues  ·  This volume   ·   Previous abstract   ·   Next abstract



New Zealand Plant Protection 69 (2016): 238-245

How many conidia are required for wound infection of apple plants by Neonectria ditissima?

M. Walter, S. Roy, B.M. Fisher, L. Mackle, N.T. Amponsah, T. Curnow, R.E. Campbell, P. Braun, A. Reineke and R.W.A. Scheper

ABSTRACT

A series of experiments, using potted plants in a glasshouse, detached laterals in the laboratory and trees in the fi eld, were undertaken to study wound size and number of Neonectria ditissima conidia required to produce European canker infections on freshly-made branch wounds in the apple cultivars 'Royal Gala' and 'Scilate'. Th e wound types were needle and pin injuries, rasp wounds and pruning cuts. Spore concentrations from 102 to 106 conidia/ml, and two inoculation methods (droplet and mist), were used. Disease expression varied for the different assay types, probably due to the conduciveness for infection of the diff erent incubation conditions. Overall, there was little eff ect on pathogen colonisation and lesion development based on injury type, inoculation method or spore concentration >103 conidia/ml. For freshly-made wounds, such as pruning cuts or rasp wounds, only three conidia were required for infection initiation in the glasshouse under highly conducive conditions, 12 conidia in the laboratory on detached shoots, and 10 to 30 conidia in the fi eld.

Keywords: Neonectria galligena, Nectria galligena, European canker, apple, spore concentration, pruning wounds.

Related articles
pdfProtection of budding wounds in apple nursery trees from European canker
R.W.A. Scheper, O.D. Stevenson and D.I. Hedderley (2016)
New Zealand Plant Protection 69: 207-212
pdfSeasonal wound presence and susceptibility to Neonectria ditissima infection in New Zealand apple trees
N.T. Amponsah, M. Walter R.M. Beresford and R.W.A. Scheper (2015)
New Zealand Plant Protection 68: 250-256
pdfAgar media for isolation of Neonectria ditissima from symptomatic and asymptomatic apple tissues and production of infective conidia
N.T. Amponsah, M. Walter and R.W.A. Scheper (2014)
New Zealand Plant Protection 67: 116-122
pdfComparing methods to determine European canker resistance in apple tree accessions
R.W.A. Scheper and B.M. Fisher (2010)
New Zealand Plant Protection 63: 280

Copyright © 2016 New Zealand Plant Protection Society (Inc.).

Please refer to the terms of use.