ISHS Acta Horticulturae 234: VII International Symposium on Virus Diseases of Ornamental Plants
SYMPTOMATOLOGY AND OCCURRENCE OF APPLE MOSAIC AND PRUNUS NECROTIC RINGSPOT VIRUSES ON ROSE IN NEW YORK |
| Authors: | S.-M. Wong, R.K. Horst, R.W. Langhans |
| Abstract:
Field grown roses in New York were surveyed from 1983–1986 by visual symptoms and by enzyme linked immunosorbent assay (ELISA) to determine the incidence and the expression of virus infections. Viral symptom expression varied from year to year among the 19 surveyed cultivars. Apple mosaic virus (ApMV) infected rose foliage had more chlorotic patches, puckering and distortion than prunus necrotic ringspot virus (PNRSV) infected foliage; whereas, PNRSV infected foliage exhibited more mosaic and mottling symptoms. Line pattern, ringspot, and line pattern plus ringspot symptoms were associated with both ApMV and PNRSV. High ELISA readings were obtained from petals and from young leaves sampled when infected plants were in full bloom. ApMV and PNRSV were detected by ELISA but arabis mosaic virus and strawberry latent ringspot virus were not. PNRSV was more prevalent than ApMV. Of the 19 surveyed cultivars, only Nearly Wild appeared to be resistant to both viruses because symptoms were never observed nor was virus isolated or detected with ELISA. The effect of infection with ApMV and PNRSV on flower production and quality was evaluated on 6 rose cultivars grown in a glasshouse. Preliminary results 20 weeks after inoculation revealed no effect on mean grade or on total number of flower cuts associated with infection by PNRSV and ApMV; however, viral symptoms were apparent on foliage. Differences in mean grade and total number of flower cuts among cultivars was associated with their expected genetic variability. | |
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