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A polyclonal rabbit antiserum was obtained to the nucleoprotein of tomato spotted wilt tospovirus expressed as a recombinant fusion protein in E. coli. In indirect plate trapping ELISA, the antiserum gave similar titres against purified TSWV nucleocapsids in native form, the fusion protein and the carrier protein. The crude antiserum was also tested by Western blotting, indirect plate trapping ELISA and immunogold electron microscopy of thin sections; purified immunoglobulins were tested by DAS-ELISA. In all cases, with both glasshouse and field material, the antibodies had good detectability and specificity. By ELISA and Western blots against other tospoviruses, impatiens necrotic spot and groundnut bud necrosis viruses did not react but there was a reaction with groundnut ringspot virus, reflecting the nucleoprotein amino acid sequence similarity. These antibodies combine specificity to the target protein and …