New Zealand Journal of Crop and Horticultural Science abstracts
Sensitivity of apple (Malus domestica) indicator cultivars to russet
ring disease, and the results of graft-transmission trials of other
fruit-affecting disorders of apple
G. A. WOOD
The Horticulture and Food Research
Institute of New Zealand Ltd
Mt Albert Research Centre
Private Bag 92 169
Auckland, New Zealand
Abstract In an evaluation in New Zealand of four Canadian
apple (
Malus domestica Borkh.) cultivars used as indicators for the
russet ring and leaf pucker group of diseases, `Jubilee' and `Yellow Newtown'
proved to be the most sensitive to the diseases present in New Zealand, with
`Blaxstayman' being almost as sensitive. A leaf chlorosis, and fruit russet and
distortion condition of `Fuji' apple was shown to be graft-transmissible and
probably caused by a virus. The conditions causing leaf malformation and a
streaked fruit russet of `Braeburn', and a bumpy russet of `Royal Gala' appear
to be caused by genetic mutations. Of three red-skinned sports of `Braeburn',
bud-inoculated with type B russet ring, only `Braestar' produced fruit
symptoms, several seasons after bud inoculation. A test of some selected apple
rootstocks from commercial nurseries indicated that they were free from type B
russet ring.
Keywords Malus; apple cultivars; apple indicator
cultivars; russet ring disease; leaf chlorosis symptom; genetic mutation
H01030
Received 11 June 2001; accepted 11 October 2001
New Zealand Journal of Crop and Horticultural Science, 2001, Vol. 29:
255-265
0014-0671/01/2904-0255 $7.00 (c) The Royal Society of New Zealand 2001
PDF file of entire paper: medium quality (1471K); (scanned from paper original: notes about this process)
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