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Description
Two grapevineviroids, GYSVd-1 and GYSVd-2, have been implicated as the causal agents of yellow speckle (YS) disease. Eighty-five percent of the 137 varieties analyzed from California and Europe carry the causal agent of YS or a viroid of similar molecular weight. A synergistic reaction between YS and grapevine fanleaf virus (GFLV) has been proposed to cause veinbanding (VB). YS and VB symptomatic tissues were analyzed for viroid content. The vines analyzed contained one of the causal agents of yellow speckle disease, GYSVd-1. A higher viroid titer in both the YS and VB symptomatic tissues in comparison to symptomless tissues was observed. Attempts to induce YS symptoms under control conditions of high temperature and continuous light were tested and will be discussed. To test the incidence of transmission under field conditions, viroid-free grapevines wereinterplanted with vines containingGYSVd-1 and HSVD-2 in a commercial vineyard. Dormant wood from the interplanted grapevines was collected yearly and tissue from each vine analyzed forviroid content. To determine the occurrence of viroid transmission through the roots, a viroid-free and a viroid-infected vine were grown in a one-gallon container. A sequential inoculation was completed to test the quantitative differences in viroid content observed in clonal selections of Cabernet Sauvignon. The incidence of occurrence and relative viroid transmission will be presented.
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