ISHS Acta Horticulturae 234: VII International Symposium on Virus Diseases of Ornamental Plants
EFECTS OF PRUNUS NECROTIC RINGSPOT VIRUS ON GRAFT UNION AND FLOWER QUALITY OF GLASSHOUSE GROWN ROSES IN ISRAEL |
| Authors: | A. Stein, S. Levy, G. Loebenstein |
| Abstract:
Prunus necrotic ring spot virus (PNRSV) was found to be associated with a range of rose mosaic disease symptoms in glasshouse-grown roses in Israel. Mature diseased plants appear normal except for seemingly insignificant leaf symptoms which may differ from one cultivar to another. The symptoms are transient during the plant lifetime with no apparent correlation to the titer of PNRSV as measured by ELISA. Performance of PNRSV infected roses plants was evaluated during 1984–1988 in comparison to healthy ones. The trials were conducted in four locations under intensive production conditions during the winter months, similar to the commercial routine. In all trials healthy plants yielded over 30% more quality-grade flowers, "Super" and "Extra", than PNRSV infected plants. The difference in the total yields of flowers was less significant. The inferior yielding capacity of infected plants could not be attributed to a single parameter of growth or development. Severe effects of grafting infected Mercedes scions to healthy Rosa indica stocks was observed. When unrooted sticks of R. indica were used, only 20% of the graft unions with infected scions were successful, as compared to 90% success with healthy scions. This method of preparing planting material might thus eliminate most of the infected propagation material. | |
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