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Constriction and Decline of ‘Stanley’ Prune Associated with Tomato Ringspot Virus


Tomato ringspot virus (TmRSV) was consistently detected in myrobalan (Prunus cerasifera) and in 8 other plum rootstocks that exhibited prune brownline (PBL) symptoms at the graft unions. The infected rootstocks included Prunus domestica cvs. St. Julien A, Brompton, Ackermanpflaume, and Pershore and 6 seedling lines of P. cerasifera. Own-rooted ‘Stanley’ prune trees remained free of natural infection by TmRSV for 14 years on a site where 36% of the ‘Stanley’ trees on other rootstocks became infected. Mortality among TmRSV-infected trees on myrobalan stocks was higher than among infected trees on P. domestica roots. Own-rooted ‘Stanley’ trees are suggested for extensive commercial trial in areas infected with TmRSV.