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To detect the presence of TS\VV in Tehran province, tomato plant samples suspected of TSWV infection were collected from various regions in the province.
Tomato leaf sap was extracted and mechanically transmitted through several plant spesies including: Petunia hybrida. Nicotiana glutinosa, N. rabacllm cv. Samsun UN,
N. clevelandii, and N.bentamiana. These plants showed characteristic symptons such as lesions, concentric zones, stem necrosis, wilting and collapse at different times
after inoculation. Spherical particles of TSWV were observed with serologically specific electron microscopy (SSE_I) method. The result showed that TSWV
infection is prevalent in Varamin region