New Zealand Plant Protection 68 (2015): 250-256
Leaf scar wounds are important sites for Neonectria ditissima infection of apple trees. Monitoring leaf fall in 'Scilate'/Envy™ and 'Braeburn' trees to estimate leaf scar wound presence showed maximum leaf scar incidence occurred in June (early winter). Wounds detected in New Zealand apple orchards were bud scale scars, fruit thinning and picking wounds, leaf scars and pruning cuts. Picking wounds are caused during harvest where the pedicel is detached from the shoot. Susceptibility of these different types of wounds was determined using artificial inoculation of N. ditissima conidia during the season. Pruning cut wounds were the most susceptible, followed by fruit picking and thinning wounds and the least susceptible were leaf scar wounds. No infections were observed when bud scale wounds were inoculated. There was no difference in wound susceptibility between cultivars, but overall 'Scilate'/Envy™ wounds developed more lesions than 'Braeburn' wounds.
Keywords: Neonectria ditissima, Nectria galligena, conidia, ascospores, European canker, 'Scilate'/Envy™, 'Braeburn'.
|Monitoring methods and spatial patterns of European canker disease in commercial orchards|
R.E. Campbell, S. Roy, T. Curnow and M. Walter (2016)
New Zealand Plant Protection 69: 213-220
|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 (2016)
New Zealand Plant Protection 69: 238-245
|Agar 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
|Comparing 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 © 2015 New Zealand Plant Protection Society (Inc.).