Tobacco Streak Virus Infection of Tomato and Some Natural Weed Hosts in California

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Abstract
Tobacco streak virus (TSV) was isolated from tomato (L. esculentum), common yellow mustard (Brassica campestris), milk thistle (Silybum marianum), and wild radish (Raphanus raphanistrum) collected from 3 tomato fields near Sacramento. All TSV isolates from these hosts were infectious to tomato cv. Peto 81, causing necrotic symptoms on stems and leaves and ring spotting of fruit similar to symptoms observed in the field. The virus was seed borne in experimentally infected Chenopodium quinoa and naturally infected wild radish plants. Identification of the virus was based on symptomatology, host range, in vitro properties, morphology and serology.