ISHS Acta Horticulturae 59: IV International Symposium on Virus Diseases of Ornamental Plants
Article 21 |
| Authors: | R.H. Lawson, S.S. Hearon, F.F. Smith |
| Abstract:
Plants of a seedling clone of Hydrangea macrophylla (florists' hydrangea) were inoculated at monthly intervals by grafting with buds from a hydrangea with virescence disease to determine the relationship between the time of inoculation and symptom development. Most of the plants inoculated early in the season showed severe foliage symptoms and some showed flower symptoms during the first season following bud inoculation. Flower symptoms varied from completely green and dwarfed cymes to mixed pink and green florets in the same cyme. Plants inoculated later in the season often developed no symptoms in the first growing season, but after a period of dormancy in cold storage, they died within 2 months after forcing the next year. These results are discussed in relation to the natural occurrence of the disease. | |
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