Irregular Distribution of Tomato Ringspot Virus in Apple Trees

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Abstract
Leaf, bark and root samples of ''Malling-Merton 106'' (MM 106) and cultivar/MM 106 trees were assayed for tomato ringspot virus (TmRSV) by enzyme-linked immunosorbent assay (ELISA) at various times during the growing season. TmRSV was not regularly distributed within trees. In MM 106 trees, TmRSV was detected most consistently in leaves, slightly less so in bark and only erratically in roots. The average absorbance values at 405 nm declined toward the end of the growing season, and were always highest in leaves and lowest in roots. TmRSV was also detected in ''Golden Delicious'' bark tissue just above the graft union. The location and/or mode of inoculation seemed to influence the virus distribution within the trees.