Diagnostic studies were performed on 4 viruses isolated from several lettuce plantations in the central region of Poland. Identification was based on the host range, including tests plants and different lettuce cultivars, on the characteristics of virus transmissibility, as well as on their physico-chemical properties, electron microscopy and serology.
Most of the surveyed lettuce field plantations in central region of Poland were shown to be virus infected. Percentage of infected plants was however low. Five viruses have been isolated and identified, namely lettuce mosaic potyvirus (LMV), dandelion yellow mosaic sequivirus (DYMV), lettuce big vein varicosavirus (LBVV), tomato mosaic tobamovirus (ToMV) and cucumber mosaic cucumovirus (CMV). Most frequently occurred LMV and DYMV. CMV and ToMV were isolated accidentally.
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