Abstract
SummaryThe inoculation of 40 varieties of ornamental crab apple with viruses commonly carried latently in commercial apple varieties and rootstocks killed 10 of the varieties and impaired the growth of 27 others ; only 3 were unaffected. The ornamental crabs showed varying sensitivity to chlorotic leaf spot, and platycarpa dwarf viruses. The main symptoms were line and spot patterns and distortion of the leaves, tip die-back, bark necrosis and stunting.Viruses latent in some commercial apple rootstocks appear to be the main reason for the incompatibility between these stocks and the ornamental crabs. It is assumed that the same viruses also affect the compatibility of commercial apple varieties worked on ornamental crab seedlings.
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