ISHS Acta Horticulturae 112: Symposium on Breeding and Machine Harvesting of Rubus
GRAFT TRANSMISSION OF CALICO FROM THREE BLACKBERRY CULTIVARS |
| Authors: | R.H. Converse, K.L. Kowalczyk |
| Abstract:
Three calico diseases of blackberry cultivars grown in Oregon were shown to be experimentally graft-transmissible. Four blackberry hybrids, and one red raspberry cultivar were used as test plants in the grafting tests. The calico disease of 'Chehalem' blackberry gave rise to a different pattern of symptoms in grafted test hosts than the calico diseases of 'Marion' and 'Thornless Logan.' 'Marion' blackberry is a suitable greenhouse indicator host for all 3 of these calico diseases. However, allowing grafted indicator plants to go through dormancy out-of-doors increased symptom production in many cases. A heat-treated, shoot-tip-propagated clone of 'Thornless Logan' from the Canada Department of Agriculture, designated AC-2, was found to be free of Loganberry calico disease. | |
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