ISHS Acta Horticulturae 44: IX International Symposium on Fruit Tree Virus Diseases
SYMPTOMS OF STAR CRACK VIRUS ON THE FRUIT AND SHOOT GROWTH OF APPLE CULTIVARS |
| Authors: | A.I. Campbell, L.F. Hughes |
| Abstract:
The sensitivity of seventy-two heat-treated dessert, culinary and cider cultivars to star crack virus has been examined. The symptoms of the virus were seen one year after inoculation, usually as bark lesions and shoot die-back. Flower and fruit symptoms were common two years after inoculation. The same source of inoculum caused different symptoms on the cultivars. Some were severely reduced in growth and showed typical die-back and bud cankers in the winter while others showed only mild blister-like symptoms and a few were apparently tolerant to the virus. Infected trees of some cultivars came into leaf and flowered one or two weeks later than uninfected trees, whereas in other cultivars the infected trees came into leaf and flowered earlier. Fruit symptoms showed on most of the cultivars and these varied from severe distortion, cracking and reduction in size to mild pitting or simple russeting. Some cultivars showed fruit symptoms but no bark or shoot symptoms while in others the reverse occurred. | |
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