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

Details zur Publikation
Abkürzung der Fachzeitschrift: nzpp
Autorenliste: Walter M., Roy S., Fisher B.M., Mackle L., Amponsah N.T., Curnow T., Campbell R.E., Braun P., Reineke A., Scheper R.W.A.
Jahr der Veröffentlichung: 2016
Quelle: New Zealand Plant Protection
Bandnummer: 69
Erste Seite: 238
Letzte Seite: 245
Verlag: New Zealand Plant Protection Society
ISSN: 1172-0719
eISSN: 1179-352X
Sprachen: Englisch
Peer reviewed


A series of experiments, using potted plants in a glasshouse, detached
laterals in the laboratory and trees in the field, 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 field.