ISHS Acta Horticulturae 130: XII International Symposium on Fruit Tree Virus Diseases
BACK-TRANSMISSION OF APPLE STEM GROOVING VIRUS TO APPLE SEEDLINGS AND INDUCTION OF SYMPTOMS OF APPLE TOPWORKING DISEASE IN MITSUBA KAIDO (MALUS SIEBOLDII) AND KOBANO ZUMI (MALUS SIEBOLDII VAR. ARBORESCENS) ROOTSTOCKS |
| Author: | H. Yanase |
| Abstract:
Necrosis at the bud union and decline of the seedling clones of Mitsuba Kaido (Malus sieboldii) and Kobano Zumi (Malus sieboldii var. arborescens) which are common rootstock varieties, were associated with apple stem grooving virus (SGV) present in inoculum sources of apple cultivars. Six of the 11 seedling clones of Mitsuba Kaido and two of the four seedling clones of Kobano Zumi exhibited necrosis at the bud union when inoculated with the single American SGV isolate. Apple stem grooving virus isolated from an apple tree was back-transmitted to apple seedlings by rub-inoculation using purified virus preparations. The isolates thus back-transmitted induced symptoms of apple topworking disease, necrosis at the graft union and decline, in Mitsuba Kaido and Kobano Zumi. | |
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