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Description
An epidemic of latent virus disease is suspected in new vineyards planted to alternative rootstocks. The working hypothesis which explains this observation is that California growers have been propagating scion materials selected empirically for virus strains which cause mild symptoms on AXR#l. This hypothesis is supported by widespread observations of severe latent virus symptoms in vineyards where field scion selections which appear healthy on AXR#l have been grafted to certified alternative rootstocks. The symptoms which have been observed include severe stunting, internode shortening, leaf discoloration, leaf rolling, and disorders of the graft union. The common element in the history of these vineyards is that the rootstock selection was one of the new alternative rootstocks, that the rootstock source was certified, and that the scions were field-budded from non-certified selections which looked virus free on AXR#l.
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