ISHS Acta Horticulturae 94: XI International Symposium on Fruit Tree Virus Diseases
HAZEL MOSAIC |
| Author: | A. RAGOZZINO |
| Abstract:
Hazel mosaic is a widespread disease in southern Italy with extremely variable symptoms. Numerous attempts to transmit virus from different parts of infected trees to herbaceous hosts gave negative results. Periwinkle showed chlorosis and cupping of mature leaves and reduction of flower size after tissue implantation or dodder transmission from young shoots of hazel. Hazel seedlings inoculated by dodder from periwinkle showed diffuse yellowing, flushes of new leaves throughout the year, phyllody and dieback. Mycoplasma-like bodies were found both in the phloem of naturally infected hazel and in phloem of artificially inoculated periwinkle and hazel seedlings. Mycoplasmas appear to play a role in symptoms which are not considered to be typical of the true mosaic wich is probably of viral origin. ELISA tests have shown the presence of apple mosaic virus in hazeltrees with ring and line pattern. On the basis of symptoms shown by several hazel seedlings inoculated by bark grafting, it seems that more than one strain of the same virus is involved in foliar symptom expression. | |
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